TY  - JOUR
AU  - Tošić, Miloš
AU  - Rajić, Vladimir
AU  - Pjević, Dejan
AU  - Stojadinović, Stevan
AU  - Krstulović, Nikša
AU  - Dimitrijević-Branković, Suzana
AU  - Momčilović, Miloš
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13091
AB  - This study proposes a simple and controlled method for producing TiO2 with phase junction, oxygen vacancies, and Ti3+ by combining picosecond pulsed laser irradiation and electrochemical anodization. Ti mesh was pretreated by irradiating with a picosecond pulsed laser technique using an Nd:YAG laser (1064 nm) at two fluencies, 15 J/cm2 and 30 J/cm2 . The samples were then subjected to electrochemical anodization to form TiO2 nanotube arrays on the previously laser-treated surface. This study will investigate the possibility of forming TiO2 nanotube arrays on a pre-laser-treated Ti substrate and determine their physicochemical and photocatalytic properties. The samples were characterized by FESEM, XRD, Raman, XPS, and UV-Vis DRS. UV-Vis spectroscopy was used to observe the progress of photocatalytic degradation for all samples, and degradation products were determined using GC-MS. With the synergistic effects of phase junction, oxygen vacancies, and Ti3+, the laser-treated TiO2 with 30 J/cm2 showed a higher photocatalytic degradation rate (85.1%) of the pesticide carbofuran compared to non-laser-treated TiO2 (54.8%), remaining stable during successive degradation cycles, which has promising practical applications.
T2  - Photonics
T1  - Synergy of Nd:YAG Picosecond Pulsed Laser Irradiation and Electrochemical Anodization in the Formation of TiO2 Nanostructures for the Photocatalytic Degradation of Pesticide Carbofuran
VL  - 11
IS  - 3
SP  - 284
DO  - 10.3390/photonics11030284
ER  - 

@article{
author = "Tošić, Miloš and Rajić, Vladimir and Pjević, Dejan and Stojadinović, Stevan and Krstulović, Nikša and Dimitrijević-Branković, Suzana and Momčilović, Miloš",
year = "2024",
abstract = "This study proposes a simple and controlled method for producing TiO2 with phase junction, oxygen vacancies, and Ti3+ by combining picosecond pulsed laser irradiation and electrochemical anodization. Ti mesh was pretreated by irradiating with a picosecond pulsed laser technique using an Nd:YAG laser (1064 nm) at two fluencies, 15 J/cm2 and 30 J/cm2 . The samples were then subjected to electrochemical anodization to form TiO2 nanotube arrays on the previously laser-treated surface. This study will investigate the possibility of forming TiO2 nanotube arrays on a pre-laser-treated Ti substrate and determine their physicochemical and photocatalytic properties. The samples were characterized by FESEM, XRD, Raman, XPS, and UV-Vis DRS. UV-Vis spectroscopy was used to observe the progress of photocatalytic degradation for all samples, and degradation products were determined using GC-MS. With the synergistic effects of phase junction, oxygen vacancies, and Ti3+, the laser-treated TiO2 with 30 J/cm2 showed a higher photocatalytic degradation rate (85.1%) of the pesticide carbofuran compared to non-laser-treated TiO2 (54.8%), remaining stable during successive degradation cycles, which has promising practical applications.",
journal = "Photonics",
title = "Synergy of Nd:YAG Picosecond Pulsed Laser Irradiation and Electrochemical Anodization in the Formation of TiO2 Nanostructures for the Photocatalytic Degradation of Pesticide Carbofuran",
volume = "11",
number = "3",
pages = "284",
doi = "10.3390/photonics11030284"
}

Tošić, M., Rajić, V., Pjević, D., Stojadinović, S., Krstulović, N., Dimitrijević-Branković, S.,& Momčilović, M.. (2024). Synergy of Nd:YAG Picosecond Pulsed Laser Irradiation and Electrochemical Anodization in the Formation of TiO2 Nanostructures for the Photocatalytic Degradation of Pesticide Carbofuran. in Photonics, 11(3), 284.
https://doi.org/10.3390/photonics11030284

Tošić M, Rajić V, Pjević D, Stojadinović S, Krstulović N, Dimitrijević-Branković S, Momčilović M. Synergy of Nd:YAG Picosecond Pulsed Laser Irradiation and Electrochemical Anodization in the Formation of TiO2 Nanostructures for the Photocatalytic Degradation of Pesticide Carbofuran. in Photonics. 2024;11(3):284.
doi:10.3390/photonics11030284 .

Tošić, Miloš, Rajić, Vladimir, Pjević, Dejan, Stojadinović, Stevan, Krstulović, Nikša, Dimitrijević-Branković, Suzana, Momčilović, Miloš, "Synergy of Nd:YAG Picosecond Pulsed Laser Irradiation and Electrochemical Anodization in the Formation of TiO2 Nanostructures for the Photocatalytic Degradation of Pesticide Carbofuran" in Photonics, 11, no. 3 (2024):284,
https://doi.org/10.3390/photonics11030284 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Stojadinović, Stevan
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11828
AB  - Eu3+ doped Zirconia coatings were synthesized by the electrochemical plasma electrolytic oxidation method in only 8 min from the pure zirconium substrate. The phase constitution from pure monoclinic to pure tetragonal and exactly in between was achieved by using different concentrations of Na3PO4 and NaAlO2 electrolytes. The complex emission spectra composed of Eu2+, Eu3+, and ZrO2 defect emission greatly depend on the excitation wavelength and phase constitution. Eu3+ photoluminescence properties depend on the phase, which is reflected by the different Stark splitting and different intensities of transitions. Thus, both phase and photoluminescent properties of ZrO2 coatings are fine-tuneable. Judd-Ofelt analysis was performed from the emission and excitation spectra, showing that all 3 intensity parameters depend linearly on the phase constitution, being largest in the pure monoclinic phase. The mixed phase has Judd-Ofelt parameters between those in pure phases. Eu3+ has 2.45 times more preference to get incorporated into the tetragonal than in the monoclinic phase in the mixed phase samples. The general equation for Judd-Ofelt parameters in a compound with mixed constituents and probability of incorporation is introduced, allowing also for a prediction of the spectrum shape based on the Judd-Ofelt parameters of pure-phase compounds. Python software code for estimating the percent of incorporation by multiple linear regression model is also provided.
T2  - Journal of Luminescence
T1  - Tuning phase and photoluminescent properties of ZrO2:Eu3+ coatings formed by plasma electrolytic oxidation and Judd-Ofelt analysis of composite materials
VL  - 266
SP  - 120268
DO  - 10.1016/j.jlumin.2023.120268
ER  - 

@article{
author = "Ćirić, Aleksandar and Stojadinović, Stevan",
year = "2024",
abstract = "Eu3+ doped Zirconia coatings were synthesized by the electrochemical plasma electrolytic oxidation method in only 8 min from the pure zirconium substrate. The phase constitution from pure monoclinic to pure tetragonal and exactly in between was achieved by using different concentrations of Na3PO4 and NaAlO2 electrolytes. The complex emission spectra composed of Eu2+, Eu3+, and ZrO2 defect emission greatly depend on the excitation wavelength and phase constitution. Eu3+ photoluminescence properties depend on the phase, which is reflected by the different Stark splitting and different intensities of transitions. Thus, both phase and photoluminescent properties of ZrO2 coatings are fine-tuneable. Judd-Ofelt analysis was performed from the emission and excitation spectra, showing that all 3 intensity parameters depend linearly on the phase constitution, being largest in the pure monoclinic phase. The mixed phase has Judd-Ofelt parameters between those in pure phases. Eu3+ has 2.45 times more preference to get incorporated into the tetragonal than in the monoclinic phase in the mixed phase samples. The general equation for Judd-Ofelt parameters in a compound with mixed constituents and probability of incorporation is introduced, allowing also for a prediction of the spectrum shape based on the Judd-Ofelt parameters of pure-phase compounds. Python software code for estimating the percent of incorporation by multiple linear regression model is also provided.",
journal = "Journal of Luminescence",
title = "Tuning phase and photoluminescent properties of ZrO2:Eu3+ coatings formed by plasma electrolytic oxidation and Judd-Ofelt analysis of composite materials",
volume = "266",
pages = "120268",
doi = "10.1016/j.jlumin.2023.120268"
}

Ćirić, A.,& Stojadinović, S.. (2024). Tuning phase and photoluminescent properties of ZrO2:Eu3+ coatings formed by plasma electrolytic oxidation and Judd-Ofelt analysis of composite materials. in Journal of Luminescence, 266, 120268.
https://doi.org/10.1016/j.jlumin.2023.120268

Ćirić A, Stojadinović S. Tuning phase and photoluminescent properties of ZrO2:Eu3+ coatings formed by plasma electrolytic oxidation and Judd-Ofelt analysis of composite materials. in Journal of Luminescence. 2024;266:120268.
doi:10.1016/j.jlumin.2023.120268 .

Ćirić, Aleksandar, Stojadinović, Stevan, "Tuning phase and photoluminescent properties of ZrO2:Eu3+ coatings formed by plasma electrolytic oxidation and Judd-Ofelt analysis of composite materials" in Journal of Luminescence, 266 (2024):120268,
https://doi.org/10.1016/j.jlumin.2023.120268 . .

TY  - JOUR
AU  - Aleksić, Katarina
AU  - Stojković Simatović, Ivana
AU  - Stanković, Ana
AU  - Veselinović, Ljiljana
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Radmilović, Nadežda
AU  - Rajić, Vladimir
AU  - Škapin, Srečo Davor
AU  - Mančić, Lidija
AU  - Marković, Smilja
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11080
AB  - Catalytic materials are the greatest challenge for the commercial application of water electrolysis (WEs) and fuel cells (FCs) as clean energy technologies. There is a need to find an alternative to expensive and unavailable platinum group metal (PGM) catalysts. This study aimed to reduce the cost of PGM materials by replacing Ru with RuO2 and lowering the amount of RuO2 by adding abundant and multifunctional ZnO. A ZnO@RuO2 composite in a 10:1 molar ratio was synthesized by microwave processing of a precipitate as a green, low-cost, and fast method, and then annealed at 300°C and 600°C to improve the catalytic properties. The physicochemical properties of the ZnO@RuO2 composites were investigated by X-ray powder diffraction (XRD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The electrochemical activity of the samples was investigated by linear sweep voltammetry in acidic and alkaline electrolytes. We observed good bifunctional catalytic activity of the ZnO@RuO2 composites toward HER and OER in both electrolytes. The improved bifunctional catalytic activity of the ZnO@RuO2 composite by annealing was discussed and attributed to the reduced number of bulk oxygen vacancies and the increased number of established heterojunctions.
T2  - Frontiers in Chemistry
T1  - Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting
VL  - 11
DO  - 10.3389/fchem.2023.1173910
ER  - 

@article{
author = "Aleksić, Katarina and Stojković Simatović, Ivana and Stanković, Ana and Veselinović, Ljiljana and Stojadinović, Stevan and Rac, Vladislav and Radmilović, Nadežda and Rajić, Vladimir and Škapin, Srečo Davor and Mančić, Lidija and Marković, Smilja",
year = "2023",
abstract = "Catalytic materials are the greatest challenge for the commercial application of water electrolysis (WEs) and fuel cells (FCs) as clean energy technologies. There is a need to find an alternative to expensive and unavailable platinum group metal (PGM) catalysts. This study aimed to reduce the cost of PGM materials by replacing Ru with RuO2 and lowering the amount of RuO2 by adding abundant and multifunctional ZnO. A ZnO@RuO2 composite in a 10:1 molar ratio was synthesized by microwave processing of a precipitate as a green, low-cost, and fast method, and then annealed at 300°C and 600°C to improve the catalytic properties. The physicochemical properties of the ZnO@RuO2 composites were investigated by X-ray powder diffraction (XRD), Raman and Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), UV-Vis diffuse reflectance spectroscopy (DRS), and photoluminescence (PL) spectroscopy. The electrochemical activity of the samples was investigated by linear sweep voltammetry in acidic and alkaline electrolytes. We observed good bifunctional catalytic activity of the ZnO@RuO2 composites toward HER and OER in both electrolytes. The improved bifunctional catalytic activity of the ZnO@RuO2 composite by annealing was discussed and attributed to the reduced number of bulk oxygen vacancies and the increased number of established heterojunctions.",
journal = "Frontiers in Chemistry",
title = "Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting",
volume = "11",
doi = "10.3389/fchem.2023.1173910"
}

Aleksić, K., Stojković Simatović, I., Stanković, A., Veselinović, L., Stojadinović, S., Rac, V., Radmilović, N., Rajić, V., Škapin, S. D., Mančić, L.,& Marković, S.. (2023). Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting. in Frontiers in Chemistry, 11.
https://doi.org/10.3389/fchem.2023.1173910

Aleksić K, Stojković Simatović I, Stanković A, Veselinović L, Stojadinović S, Rac V, Radmilović N, Rajić V, Škapin SD, Mančić L, Marković S. Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting. in Frontiers in Chemistry. 2023;11.
doi:10.3389/fchem.2023.1173910 .

Aleksić, Katarina, Stojković Simatović, Ivana, Stanković, Ana, Veselinović, Ljiljana, Stojadinović, Stevan, Rac, Vladislav, Radmilović, Nadežda, Rajić, Vladimir, Škapin, Srečo Davor, Mančić, Lidija, Marković, Smilja, "Enhancement of ZnO@RuO2 bifunctional photo-electro catalytic activity toward water splitting" in Frontiers in Chemistry, 11 (2023),
https://doi.org/10.3389/fchem.2023.1173910 . .

TY  - JOUR
AU  - Martinović, Ana
AU  - Milićević, Bojana
AU  - Periša, Jovana
AU  - Ristić, Zoran
AU  - Stojadinović, Stevan
AU  - Dramićanin, Miroslav
AU  - Ćirić, Aleksandar
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11361
AB  - Luminescence thermometry uses temperature-dependent emission of light for remote sensing. Dy3+ is established as a perspective ion for high-temperature probes, but given that there is an infinite number of potential hosts it is impossible to find conventionally the one with the best performance. Judd-Ofelt thermometric model can predict sensitivities but it was not yet experimentally validated on Dy3+ ion. Pure phase CaYAlO4:Dy3+ powder was synthesized via the modified Pechini method. Photoluminescence spectra were taken from 300 to 600 K. Luminescence intensity ratio was estimated using 4 I15/2 and 4 F9/2 levels. Experimentally obtained thermometric parameters and sensitivities showed an excellent matching with those obtained from the Judd-Ofelt, indicating the potential application of the Judd-Ofelt model for fast assessment of Dy3+-doped luminescent sensor thermometric perspective. The maximum absolute and relative sensitivities are ~0.001 K− 1 at 600 K and ~1.4% K− 1 at 300 K, respectively. The optimum temperature range for the CaYAlO4:Dy3+ probe is from 370 to 616 K.
T2  - Physica B: Condensed Matter
T1  - Thermometric Judd-Ofelt model for Dy3+ ion tested in CaYAlO4 host and evaluation of its sensing performances for luminescence thermometry
VL  - 666
SP  - 415096
DO  - 10.1016/j.physb.2023.415096
ER  - 

@article{
author = "Martinović, Ana and Milićević, Bojana and Periša, Jovana and Ristić, Zoran and Stojadinović, Stevan and Dramićanin, Miroslav and Ćirić, Aleksandar",
year = "2023",
abstract = "Luminescence thermometry uses temperature-dependent emission of light for remote sensing. Dy3+ is established as a perspective ion for high-temperature probes, but given that there is an infinite number of potential hosts it is impossible to find conventionally the one with the best performance. Judd-Ofelt thermometric model can predict sensitivities but it was not yet experimentally validated on Dy3+ ion. Pure phase CaYAlO4:Dy3+ powder was synthesized via the modified Pechini method. Photoluminescence spectra were taken from 300 to 600 K. Luminescence intensity ratio was estimated using 4 I15/2 and 4 F9/2 levels. Experimentally obtained thermometric parameters and sensitivities showed an excellent matching with those obtained from the Judd-Ofelt, indicating the potential application of the Judd-Ofelt model for fast assessment of Dy3+-doped luminescent sensor thermometric perspective. The maximum absolute and relative sensitivities are ~0.001 K− 1 at 600 K and ~1.4% K− 1 at 300 K, respectively. The optimum temperature range for the CaYAlO4:Dy3+ probe is from 370 to 616 K.",
journal = "Physica B: Condensed Matter",
title = "Thermometric Judd-Ofelt model for Dy3+ ion tested in CaYAlO4 host and evaluation of its sensing performances for luminescence thermometry",
volume = "666",
pages = "415096",
doi = "10.1016/j.physb.2023.415096"
}

Martinović, A., Milićević, B., Periša, J., Ristić, Z., Stojadinović, S., Dramićanin, M.,& Ćirić, A.. (2023). Thermometric Judd-Ofelt model for Dy3+ ion tested in CaYAlO4 host and evaluation of its sensing performances for luminescence thermometry. in Physica B: Condensed Matter, 666, 415096.
https://doi.org/10.1016/j.physb.2023.415096

Martinović A, Milićević B, Periša J, Ristić Z, Stojadinović S, Dramićanin M, Ćirić A. Thermometric Judd-Ofelt model for Dy3+ ion tested in CaYAlO4 host and evaluation of its sensing performances for luminescence thermometry. in Physica B: Condensed Matter. 2023;666:415096.
doi:10.1016/j.physb.2023.415096 .

Martinović, Ana, Milićević, Bojana, Periša, Jovana, Ristić, Zoran, Stojadinović, Stevan, Dramićanin, Miroslav, Ćirić, Aleksandar, "Thermometric Judd-Ofelt model for Dy3+ ion tested in CaYAlO4 host and evaluation of its sensing performances for luminescence thermometry" in Physica B: Condensed Matter, 666 (2023):415096,
https://doi.org/10.1016/j.physb.2023.415096 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Stojadinović, Stevan
AU  - Dramićanin, Miroslav
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11372
AB  - The industrial applications of luminescent coatings for temperature sensing and high-security QR codes have multiple inherent problems in their application (speed, cost, industrial feasibility) or properties (poor adhesion, chemical, thermal stability, or thermal contact). Luminescent coatings created by the electrochemical Plasma Electrolytic Oxidation (PEO) process have superior properties and can be grown directly within minutes, but are limited to the number of possible luminescent dopants. Having the unlimited possibility for doping on the PEO coatings would provide for superior coatings in all industrially appealing features. Herein, it is shown that adding any luminescent powder results in its partial dissociation and incorporation of its constituents, while it also gets incorporated as a whole. In this manner, alumina coatings are grown with various combinations and concentrations of divalent samarium and europium, and yttrium oxide with trivalent europium ions. These polycrystalline coatings whose microhardness is next to that of the diamond produce intense luminescence in the blue and red regions. Al2O3:Eu2+/Sm2+/3+ + Y2O3:Eu3+ coatings show an excellent temperature sensing performance from the cryogenic up to the high temperatures. Ultimately, the proof-of-concept of the luminescent QR code by the electrochemical process is realized creating a highly secure code with unprecedented environmental stability. © 2023 Wiley-VCH GmbH.
T2  - Advanced Materials Technologies
T1  - Multifunctional Al2O3:Eu2+/Sm2+,3+ + Y2O3:Eu3+ Coatings Created by the Plasma Electrolytic Oxidation
DO  - 10.1002/admt.202300607
ER  - 

@article{
author = "Ćirić, Aleksandar and Stojadinović, Stevan and Dramićanin, Miroslav",
year = "2023",
abstract = "The industrial applications of luminescent coatings for temperature sensing and high-security QR codes have multiple inherent problems in their application (speed, cost, industrial feasibility) or properties (poor adhesion, chemical, thermal stability, or thermal contact). Luminescent coatings created by the electrochemical Plasma Electrolytic Oxidation (PEO) process have superior properties and can be grown directly within minutes, but are limited to the number of possible luminescent dopants. Having the unlimited possibility for doping on the PEO coatings would provide for superior coatings in all industrially appealing features. Herein, it is shown that adding any luminescent powder results in its partial dissociation and incorporation of its constituents, while it also gets incorporated as a whole. In this manner, alumina coatings are grown with various combinations and concentrations of divalent samarium and europium, and yttrium oxide with trivalent europium ions. These polycrystalline coatings whose microhardness is next to that of the diamond produce intense luminescence in the blue and red regions. Al2O3:Eu2+/Sm2+/3+ + Y2O3:Eu3+ coatings show an excellent temperature sensing performance from the cryogenic up to the high temperatures. Ultimately, the proof-of-concept of the luminescent QR code by the electrochemical process is realized creating a highly secure code with unprecedented environmental stability. © 2023 Wiley-VCH GmbH.",
journal = "Advanced Materials Technologies",
title = "Multifunctional Al2O3:Eu2+/Sm2+,3+ + Y2O3:Eu3+ Coatings Created by the Plasma Electrolytic Oxidation",
doi = "10.1002/admt.202300607"
}

Ćirić, A., Stojadinović, S.,& Dramićanin, M.. (2023). Multifunctional Al2O3:Eu2+/Sm2+,3+ + Y2O3:Eu3+ Coatings Created by the Plasma Electrolytic Oxidation. in Advanced Materials Technologies.
https://doi.org/10.1002/admt.202300607

Ćirić A, Stojadinović S, Dramićanin M. Multifunctional Al2O3:Eu2+/Sm2+,3+ + Y2O3:Eu3+ Coatings Created by the Plasma Electrolytic Oxidation. in Advanced Materials Technologies. 2023;.
doi:10.1002/admt.202300607 .

Ćirić, Aleksandar, Stojadinović, Stevan, Dramićanin, Miroslav, "Multifunctional Al2O3:Eu2+/Sm2+,3+ + Y2O3:Eu3+ Coatings Created by the Plasma Electrolytic Oxidation" in Advanced Materials Technologies (2023),
https://doi.org/10.1002/admt.202300607 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Stojadinović, Stevan
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10587
AB  - 15 μm thick ZrO2:Nd3+ coatings were synthesized by the plasma electrolytic oxidation process from the pure zirconium substrate in an alkaline electrolyte with the addition of five different concentrations of Nd2O3 powders. SEM/EDS images show morphologies characterized by numerous pores and cracks, and uniform distribution of coating constituents. XRD revealed that the monoclinic phase is dominant and that Nd impurity stabilizes the tetragonal phase. The average crystalline size is 27.5 nm. XRF revealed a linear increase in incorporated Nd with increasing Nd2O3 concentration. Photoluminescence spectra are characterized by the NIR emissions at typical energies for Nd3+ ion. The highest emission intensity is obtained with 2.0 g/L Nd2O3. The explicit equation for branching ratios in relation to the emission intensities and Judd-Ofelt parameters is recalculated. A novel, more precise equation for the calculation of the spectroscopic quality factor from the most intense emissions is presented. The spectroscopic quality factor is the lowest in the sample with the highest photoluminescent intensity, and is one of the lowest values, in comparison with the 203 spectroscopic quality factors calculated from the Judd-Ofelt parameters in the literature. The luminescence intensity decreases with temperature by the phonon-assisted cross-relaxation mechanism. The luminescence thermometry by the lifetime of 4F3/2 level shows ∼2% K−1 relative sensitivity in the 300–380 K temperature range.
T2  - Journal of Luminescence
T1  - The spectroscopic quality factor, phase, morphological, structural, and photoluminescent analysis of ZrO2:Nd3+ coatings created by Plasma electrolytic oxidation
VL  - 257
SP  - 119665
DO  - 10.1016/j.jlumin.2022.119665
ER  - 

@article{
author = "Ćirić, Aleksandar and Stojadinović, Stevan",
year = "2023",
abstract = "15 μm thick ZrO2:Nd3+ coatings were synthesized by the plasma electrolytic oxidation process from the pure zirconium substrate in an alkaline electrolyte with the addition of five different concentrations of Nd2O3 powders. SEM/EDS images show morphologies characterized by numerous pores and cracks, and uniform distribution of coating constituents. XRD revealed that the monoclinic phase is dominant and that Nd impurity stabilizes the tetragonal phase. The average crystalline size is 27.5 nm. XRF revealed a linear increase in incorporated Nd with increasing Nd2O3 concentration. Photoluminescence spectra are characterized by the NIR emissions at typical energies for Nd3+ ion. The highest emission intensity is obtained with 2.0 g/L Nd2O3. The explicit equation for branching ratios in relation to the emission intensities and Judd-Ofelt parameters is recalculated. A novel, more precise equation for the calculation of the spectroscopic quality factor from the most intense emissions is presented. The spectroscopic quality factor is the lowest in the sample with the highest photoluminescent intensity, and is one of the lowest values, in comparison with the 203 spectroscopic quality factors calculated from the Judd-Ofelt parameters in the literature. The luminescence intensity decreases with temperature by the phonon-assisted cross-relaxation mechanism. The luminescence thermometry by the lifetime of 4F3/2 level shows ∼2% K−1 relative sensitivity in the 300–380 K temperature range.",
journal = "Journal of Luminescence",
title = "The spectroscopic quality factor, phase, morphological, structural, and photoluminescent analysis of ZrO2:Nd3+ coatings created by Plasma electrolytic oxidation",
volume = "257",
pages = "119665",
doi = "10.1016/j.jlumin.2022.119665"
}

Ćirić, A.,& Stojadinović, S.. (2023). The spectroscopic quality factor, phase, morphological, structural, and photoluminescent analysis of ZrO2:Nd3+ coatings created by Plasma electrolytic oxidation. in Journal of Luminescence, 257, 119665.
https://doi.org/10.1016/j.jlumin.2022.119665

Ćirić A, Stojadinović S. The spectroscopic quality factor, phase, morphological, structural, and photoluminescent analysis of ZrO2:Nd3+ coatings created by Plasma electrolytic oxidation. in Journal of Luminescence. 2023;257:119665.
doi:10.1016/j.jlumin.2022.119665 .

Ćirić, Aleksandar, Stojadinović, Stevan, "The spectroscopic quality factor, phase, morphological, structural, and photoluminescent analysis of ZrO2:Nd3+ coatings created by Plasma electrolytic oxidation" in Journal of Luminescence, 257 (2023):119665,
https://doi.org/10.1016/j.jlumin.2022.119665 . .

TY  - JOUR
AU  - Stojadinović, Stevan
AU  - Perković, Mladen
AU  - Ćirić, Aleksandar
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11434
AB  - This study demonstrated that Ta2O5 coatings formed by plasma electrolytic oxidation of tantalum substrate in an alkaline electrolyte containing Ho2O3 nanoparticles have the potential to be used as a host for Ho3+ ions. Down-conversion photoluminescence (PL) intensity of Ta2O5:Ho3+ is strongly dependent on the concentration of Ho3+ incorporated into Ta2O5 coatings, which depends on the duration of the PEO process and the concentration of Ho2O3 nanoparticles in the electrolyte. In the PL emission spectra, dominant green PL emission bands of Ho3+ centered at around 544 nm are assigned to 5S2,5F4 → 5I8 transitions. Also observed are red and near-infrared emission bands centered at around 658 nm and 758 nm, corresponding to the 5F5 → 5I8 and 5S2,5F4 → 5I7 transitions of Ho3+, respectively. The PL excitation spectra of Ho3+ doped Ta2O5 coatings show a broad band from 250 to 325 nm caused by electron transfer between completely filled 2p orbitals of O2− ions and 4f orbitals of Ho3+ ions and a series of sharp peaks between 325 and 500 nm attributed to direct excitation of Ho3+ ions from the 5I8 ground state to higher levels of the 4f-manifold. Ta2O5:Ho3+ coatings do not exhibit detectable up-conversion PL under 980 nm excitation, but Ta2O5:Ho3+/Yb3+ coatings formed in an alkaline electrolyte containing both Ho2O3 and Yb2O3 nanoparticles do. Also discernible are three groups of up-conversion PL emission bands linked to the 4f–4f transition of Ho3+ ions. With increasing Yb3+ ion concentration in coatings, there is a progressive increase in the PL intensity of all up-conversion emission bands, indicating an efficient energy transfer from excited Yb3+ ions to Ho3+ ions. The potential mechanisms for up-conversion that could result in the population of different excited levels are discussed.
T2  - Journal of Materials Science: Materials in Electronics
T1  - Down-conversion photoluminescence of Ta2O5:Ho3+ and up-conversion photoluminescence of Ta2O5:Ho3+/Yb3+ coatings formed by plasma electrolytic oxidation of tantalum
VL  - 34
IS  - 23
SP  - 1658
DO  - 10.1007/s10854-023-11084-4
ER  - 

@article{
author = "Stojadinović, Stevan and Perković, Mladen and Ćirić, Aleksandar",
year = "2023",
abstract = "This study demonstrated that Ta2O5 coatings formed by plasma electrolytic oxidation of tantalum substrate in an alkaline electrolyte containing Ho2O3 nanoparticles have the potential to be used as a host for Ho3+ ions. Down-conversion photoluminescence (PL) intensity of Ta2O5:Ho3+ is strongly dependent on the concentration of Ho3+ incorporated into Ta2O5 coatings, which depends on the duration of the PEO process and the concentration of Ho2O3 nanoparticles in the electrolyte. In the PL emission spectra, dominant green PL emission bands of Ho3+ centered at around 544 nm are assigned to 5S2,5F4 → 5I8 transitions. Also observed are red and near-infrared emission bands centered at around 658 nm and 758 nm, corresponding to the 5F5 → 5I8 and 5S2,5F4 → 5I7 transitions of Ho3+, respectively. The PL excitation spectra of Ho3+ doped Ta2O5 coatings show a broad band from 250 to 325 nm caused by electron transfer between completely filled 2p orbitals of O2− ions and 4f orbitals of Ho3+ ions and a series of sharp peaks between 325 and 500 nm attributed to direct excitation of Ho3+ ions from the 5I8 ground state to higher levels of the 4f-manifold. Ta2O5:Ho3+ coatings do not exhibit detectable up-conversion PL under 980 nm excitation, but Ta2O5:Ho3+/Yb3+ coatings formed in an alkaline electrolyte containing both Ho2O3 and Yb2O3 nanoparticles do. Also discernible are three groups of up-conversion PL emission bands linked to the 4f–4f transition of Ho3+ ions. With increasing Yb3+ ion concentration in coatings, there is a progressive increase in the PL intensity of all up-conversion emission bands, indicating an efficient energy transfer from excited Yb3+ ions to Ho3+ ions. The potential mechanisms for up-conversion that could result in the population of different excited levels are discussed.",
journal = "Journal of Materials Science: Materials in Electronics",
title = "Down-conversion photoluminescence of Ta2O5:Ho3+ and up-conversion photoluminescence of Ta2O5:Ho3+/Yb3+ coatings formed by plasma electrolytic oxidation of tantalum",
volume = "34",
number = "23",
pages = "1658",
doi = "10.1007/s10854-023-11084-4"
}

Stojadinović, S., Perković, M.,& Ćirić, A.. (2023). Down-conversion photoluminescence of Ta2O5:Ho3+ and up-conversion photoluminescence of Ta2O5:Ho3+/Yb3+ coatings formed by plasma electrolytic oxidation of tantalum. in Journal of Materials Science: Materials in Electronics, 34(23), 1658.
https://doi.org/10.1007/s10854-023-11084-4

Stojadinović S, Perković M, Ćirić A. Down-conversion photoluminescence of Ta2O5:Ho3+ and up-conversion photoluminescence of Ta2O5:Ho3+/Yb3+ coatings formed by plasma electrolytic oxidation of tantalum. in Journal of Materials Science: Materials in Electronics. 2023;34(23):1658.
doi:10.1007/s10854-023-11084-4 .

Stojadinović, Stevan, Perković, Mladen, Ćirić, Aleksandar, "Down-conversion photoluminescence of Ta2O5:Ho3+ and up-conversion photoluminescence of Ta2O5:Ho3+/Yb3+ coatings formed by plasma electrolytic oxidation of tantalum" in Journal of Materials Science: Materials in Electronics, 34, no. 23 (2023):1658,
https://doi.org/10.1007/s10854-023-11084-4 . .

TY  - JOUR
AU  - Stojadinović, Stevan
AU  - Ćirić, Aleksandar
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11479
AB  - Orthorhombic Ta2O5:Er3+ coatings were obtained by plasma electrolytic oxidation (PEO) of tantalum in an alkaline electrolyte with the addition of Er2O3 particles in various concentrations. Down-conversion photoluminescence (PL) emission spectra is featured by sharp bands attributed to 4f–4f transitions of Er3+. The most intense green PL emission band centered at 544 nm is attributed to the 4S3/2 → 4I15/2 emission of Er3+. Population paths of the Er3+ down-conversion PL happen under resonant excitation conditions of the Er3+ from ground state 4I15/2 to higher levels, and via a broad violet charge transfer excitation band. Both excitation energy and Er content have an impact on the PL emission response in Ta2O5:Er3+ coatings. The 4I15/2 → 4G11/2 transition is the dominant excitation pathway for the PL emission of Er3+. Up-conversion PL spectra created after 980 nm irradiation of Ta2O5:Er3+ coatings have characteristic 4f–4f transitions of Er3+. The intensity of the green 4S3/2 → 4I15/2 is much higher compared to the red 4F9/2 → 4I15/2 emission of Er3+. Co-doping Ta2O5:Er3+ coatings with sensitizer Yb3+ ions increased the up-conversion emission PL intensity of Er3+ thanks to the efficient energy transfer from Yb3+ to Er3+. The red up-conversion PL intensity of 4F9/2 → 4I15/2 transition increases more rapidly with respect to green emission 4S3/2 → 4I15/2. A phonon-assisted energy back transfer process from Er3+ ions (4S3/2 → 4I13/2) to the neighboring Yb3+ ions (2F7/2 → 2F5/2) leads to enhanced red emission 4F9/2 → 4I15 and decreased green emission 4S3/2 → 4I15/2. © 2023, The Minerals, Metals & Materials Society.
T2  - Journal of Electronic Materials
T1  - Dual-Mode Photoluminescence of Er3+ -Doped Ta2O5 Coatings Formed by Plasma Electrolytic Oxidation of Tantalum
DO  - 10.1007/s11664-023-10658-6
ER  - 

@article{
author = "Stojadinović, Stevan and Ćirić, Aleksandar",
year = "2023",
abstract = "Orthorhombic Ta2O5:Er3+ coatings were obtained by plasma electrolytic oxidation (PEO) of tantalum in an alkaline electrolyte with the addition of Er2O3 particles in various concentrations. Down-conversion photoluminescence (PL) emission spectra is featured by sharp bands attributed to 4f–4f transitions of Er3+. The most intense green PL emission band centered at 544 nm is attributed to the 4S3/2 → 4I15/2 emission of Er3+. Population paths of the Er3+ down-conversion PL happen under resonant excitation conditions of the Er3+ from ground state 4I15/2 to higher levels, and via a broad violet charge transfer excitation band. Both excitation energy and Er content have an impact on the PL emission response in Ta2O5:Er3+ coatings. The 4I15/2 → 4G11/2 transition is the dominant excitation pathway for the PL emission of Er3+. Up-conversion PL spectra created after 980 nm irradiation of Ta2O5:Er3+ coatings have characteristic 4f–4f transitions of Er3+. The intensity of the green 4S3/2 → 4I15/2 is much higher compared to the red 4F9/2 → 4I15/2 emission of Er3+. Co-doping Ta2O5:Er3+ coatings with sensitizer Yb3+ ions increased the up-conversion emission PL intensity of Er3+ thanks to the efficient energy transfer from Yb3+ to Er3+. The red up-conversion PL intensity of 4F9/2 → 4I15/2 transition increases more rapidly with respect to green emission 4S3/2 → 4I15/2. A phonon-assisted energy back transfer process from Er3+ ions (4S3/2 → 4I13/2) to the neighboring Yb3+ ions (2F7/2 → 2F5/2) leads to enhanced red emission 4F9/2 → 4I15 and decreased green emission 4S3/2 → 4I15/2. © 2023, The Minerals, Metals & Materials Society.",
journal = "Journal of Electronic Materials",
title = "Dual-Mode Photoluminescence of Er3+ -Doped Ta2O5 Coatings Formed by Plasma Electrolytic Oxidation of Tantalum",
doi = "10.1007/s11664-023-10658-6"
}

Stojadinović, S.,& Ćirić, A.. (2023). Dual-Mode Photoluminescence of Er3+ -Doped Ta2O5 Coatings Formed by Plasma Electrolytic Oxidation of Tantalum. in Journal of Electronic Materials.
https://doi.org/10.1007/s11664-023-10658-6

Stojadinović S, Ćirić A. Dual-Mode Photoluminescence of Er3+ -Doped Ta2O5 Coatings Formed by Plasma Electrolytic Oxidation of Tantalum. in Journal of Electronic Materials. 2023;.
doi:10.1007/s11664-023-10658-6 .

Stojadinović, Stevan, Ćirić, Aleksandar, "Dual-Mode Photoluminescence of Er3+ -Doped Ta2O5 Coatings Formed by Plasma Electrolytic Oxidation of Tantalum" in Journal of Electronic Materials (2023),
https://doi.org/10.1007/s11664-023-10658-6 . .

TY  - CHAP
AU  - Ćirić, Aleksandar
AU  - Stojadinović, Stevan
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11640
AB  - Down-conversion photoluminescent ZrO2: Ln3+ (Ln = Eu, Sm, Er, Tb, Ho, Tm, Pr, Gd, Dy) films were prepared by the plasma electrolytic oxidation (PEO) method from a pure zirconium foil, by adding Ln2 O3 particles to a basic electrolyte. Photoluminescence (PL) emission spectra of ZrO2: Ln3+ films are characterized by a broad band of ZrO2 host with a maximum positioned at about 490 nm and sharp emission bands ascribed to 4f–4f transitions of Ln3+ ions. The most intense 4f–4f transitions of Ln3+ are 5 D 0  →  7 F2 at 613 nm for Eu3+,4 G5/2  → 6 H7/2 at 617 nm for Sm3+,4 S3/2  → 4 I15/2 at 548 nm for Er3+,5 D4  → 7 F5 at 543 nm for Tb3+,5 F4  → 5 I8 at 540 nm for Ho3+,1 D2  → 3 F4 at 456 nm for Tm3+,3 P0  → 3 H6 at 608 nm for Pr3+,6 P7/2  → 8 S7/2at 313 nm for Gd3+, and4 F9/2 → 6 H13/2at 578 nm for Dy3+. Ln3+ ions in ZrO2 host can be directly excited into 4f levels. For Eu3+ more efficient excitation is through charge transfer band caused by electron transfer between the completely filled 2p orbital of O2− ions and the partially filled 4f orbital of Eu3+, while for Tb3+ through the inter-configurational 4f8  → 4f7 5d1 transition.
PB  - Wiley
T2  - Nanotechnology in Electronics: Materials, Properties, Devices
T1  - Down-conversion Photoluminescence Properties of ZrO 2  : Ln 3+ (Ln = Eu, Sm, Er, Tb, Ho, Tm, Pr, Gd, Dy) Films Formed by Plasma Electrolytic Oxidation
SP  - 279
EP  - 300
DO  - 10.1002/9783527824229.ch9
ER  - 

@inbook{
author = "Ćirić, Aleksandar and Stojadinović, Stevan",
year = "2023",
abstract = "Down-conversion photoluminescent ZrO2: Ln3+ (Ln = Eu, Sm, Er, Tb, Ho, Tm, Pr, Gd, Dy) films were prepared by the plasma electrolytic oxidation (PEO) method from a pure zirconium foil, by adding Ln2 O3 particles to a basic electrolyte. Photoluminescence (PL) emission spectra of ZrO2: Ln3+ films are characterized by a broad band of ZrO2 host with a maximum positioned at about 490 nm and sharp emission bands ascribed to 4f–4f transitions of Ln3+ ions. The most intense 4f–4f transitions of Ln3+ are 5 D 0  →  7 F2 at 613 nm for Eu3+,4 G5/2  → 6 H7/2 at 617 nm for Sm3+,4 S3/2  → 4 I15/2 at 548 nm for Er3+,5 D4  → 7 F5 at 543 nm for Tb3+,5 F4  → 5 I8 at 540 nm for Ho3+,1 D2  → 3 F4 at 456 nm for Tm3+,3 P0  → 3 H6 at 608 nm for Pr3+,6 P7/2  → 8 S7/2at 313 nm for Gd3+, and4 F9/2 → 6 H13/2at 578 nm for Dy3+. Ln3+ ions in ZrO2 host can be directly excited into 4f levels. For Eu3+ more efficient excitation is through charge transfer band caused by electron transfer between the completely filled 2p orbital of O2− ions and the partially filled 4f orbital of Eu3+, while for Tb3+ through the inter-configurational 4f8  → 4f7 5d1 transition.",
publisher = "Wiley",
journal = "Nanotechnology in Electronics: Materials, Properties, Devices",
booktitle = "Down-conversion Photoluminescence Properties of ZrO 2  : Ln 3+ (Ln = Eu, Sm, Er, Tb, Ho, Tm, Pr, Gd, Dy) Films Formed by Plasma Electrolytic Oxidation",
pages = "279-300",
doi = "10.1002/9783527824229.ch9"
}

Ćirić, A.,& Stojadinović, S.. (2023). Down-conversion Photoluminescence Properties of ZrO 2  : Ln 3+ (Ln = Eu, Sm, Er, Tb, Ho, Tm, Pr, Gd, Dy) Films Formed by Plasma Electrolytic Oxidation. in Nanotechnology in Electronics: Materials, Properties, Devices
Wiley., 279-300.
https://doi.org/10.1002/9783527824229.ch9

Ćirić A, Stojadinović S. Down-conversion Photoluminescence Properties of ZrO 2  : Ln 3+ (Ln = Eu, Sm, Er, Tb, Ho, Tm, Pr, Gd, Dy) Films Formed by Plasma Electrolytic Oxidation. in Nanotechnology in Electronics: Materials, Properties, Devices. 2023;:279-300.
doi:10.1002/9783527824229.ch9 .

Ćirić, Aleksandar, Stojadinović, Stevan, "Down-conversion Photoluminescence Properties of ZrO 2  : Ln 3+ (Ln = Eu, Sm, Er, Tb, Ho, Tm, Pr, Gd, Dy) Films Formed by Plasma Electrolytic Oxidation" in Nanotechnology in Electronics: Materials, Properties, Devices (2023):279-300,
https://doi.org/10.1002/9783527824229.ch9 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Stojadinović, Stevan
AU  - Dramićanin, Miroslav
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10105
AB  - 15 µm thick Ti-Sapphire coatings were synthesised at room temperature by the plasma electrolytic oxidation (PEO) method for 20 min from the pure aluminium substrate and with the addition of the TiO2 particles in various concentrations in the supporting electrolyte. The coatings are featured by microscopic pores typical for PEO surfaces. The dominant is the alpha phase of alumina with the small presence of the gamma phase. The estimated average crystalline size is 41 nm. Ti is uniformly distributed in these polycrystalline ceramic coatings and does not affect morphology or phase content. Photoluminescence of PEO-created coatings shows typical absorption, excitation, and emission features of Ti-Sapphire with two broad-overlapping excitation bands in the green and blue spectral region due to the Jahn-Teller splitting of the 2Eg level and the Stokes shifted emission centred at 720 nm. 2Eg energy state splitting is equal to 2195 cm−1 and 10 Dq ≈ 19,300 cm−1. The highest emission intensity was observed in the coating prepared with the 0.1 g/L TiO2 powder concentration, i.e. 0.32 at% of incorporated Ti3+. Emission spectra recorded at temperatures ranging from 100 K to 300 K revealed the Mott-Seitz temperature dependence of emission intensity with the 1180 cm−1 activation energy. The fit to the McCumber-Sturge relation gave, for the first time, the value of Debye temperature of 594 K of Al2O3:Ti. Non-contact, luminescence temperature sensing from the temperature-induced changes in the emission bandwidth gave a high sensitivity of 3.2 cm−1 K−1 and 0.19 K temperature resolution. The PEO created Ti-sapphire coatings are a promising multifunctional barrier level – optical temperature sensor material for applications in harsh environments or on large aluminium surfaces. It shows potential to be used as a planar waveguide Ti-Sapphire laser active medium.
T2  - Journal of Alloys and Compounds
T1  - Luminescence of Ti-Sapphire coatings prepared by plasma electrolytic oxidation and their application in temperature sensing
VL  - 900
SP  - 163544
DO  - 10.1016/j.jallcom.2021.163544
ER  - 

@article{
author = "Ćirić, Aleksandar and Stojadinović, Stevan and Dramićanin, Miroslav",
year = "2022",
abstract = "15 µm thick Ti-Sapphire coatings were synthesised at room temperature by the plasma electrolytic oxidation (PEO) method for 20 min from the pure aluminium substrate and with the addition of the TiO2 particles in various concentrations in the supporting electrolyte. The coatings are featured by microscopic pores typical for PEO surfaces. The dominant is the alpha phase of alumina with the small presence of the gamma phase. The estimated average crystalline size is 41 nm. Ti is uniformly distributed in these polycrystalline ceramic coatings and does not affect morphology or phase content. Photoluminescence of PEO-created coatings shows typical absorption, excitation, and emission features of Ti-Sapphire with two broad-overlapping excitation bands in the green and blue spectral region due to the Jahn-Teller splitting of the 2Eg level and the Stokes shifted emission centred at 720 nm. 2Eg energy state splitting is equal to 2195 cm−1 and 10 Dq ≈ 19,300 cm−1. The highest emission intensity was observed in the coating prepared with the 0.1 g/L TiO2 powder concentration, i.e. 0.32 at% of incorporated Ti3+. Emission spectra recorded at temperatures ranging from 100 K to 300 K revealed the Mott-Seitz temperature dependence of emission intensity with the 1180 cm−1 activation energy. The fit to the McCumber-Sturge relation gave, for the first time, the value of Debye temperature of 594 K of Al2O3:Ti. Non-contact, luminescence temperature sensing from the temperature-induced changes in the emission bandwidth gave a high sensitivity of 3.2 cm−1 K−1 and 0.19 K temperature resolution. The PEO created Ti-sapphire coatings are a promising multifunctional barrier level – optical temperature sensor material for applications in harsh environments or on large aluminium surfaces. It shows potential to be used as a planar waveguide Ti-Sapphire laser active medium.",
journal = "Journal of Alloys and Compounds",
title = "Luminescence of Ti-Sapphire coatings prepared by plasma electrolytic oxidation and their application in temperature sensing",
volume = "900",
pages = "163544",
doi = "10.1016/j.jallcom.2021.163544"
}

Ćirić, A., Stojadinović, S.,& Dramićanin, M.. (2022). Luminescence of Ti-Sapphire coatings prepared by plasma electrolytic oxidation and their application in temperature sensing. in Journal of Alloys and Compounds, 900, 163544.
https://doi.org/10.1016/j.jallcom.2021.163544

Ćirić A, Stojadinović S, Dramićanin M. Luminescence of Ti-Sapphire coatings prepared by plasma electrolytic oxidation and their application in temperature sensing. in Journal of Alloys and Compounds. 2022;900:163544.
doi:10.1016/j.jallcom.2021.163544 .

Ćirić, Aleksandar, Stojadinović, Stevan, Dramićanin, Miroslav, "Luminescence of Ti-Sapphire coatings prepared by plasma electrolytic oxidation and their application in temperature sensing" in Journal of Alloys and Compounds, 900 (2022):163544,
https://doi.org/10.1016/j.jallcom.2021.163544 . .

TY  - CHAP
AU  - Ćirić, Aleksandar
AU  - Stojadinović, Stevan
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10209
AB  - The highly-efficient upconversion photoluminescent ZrO2:Ln3+/Yb3+ (Ln = Er, Ho, Tm) films were prepared by the plasma electrolytic oxidation method from the pure zirconium foil, by adding Ln2O3 and Yb2O3 particles to the supporting electrolyte, in various concentrations. The method of synthesis, morphology, chemical, and phase composition of formed films were described and discussed. All the samples exhibit visible upconversion photoluminescence (PL) after 980 nm irradiation, which matches with the energy of the excited level of Yb3+. The upconversion PL mechanism and dependence of upconversion PL properties on Ln2O3 and Yb2O3 concentrations in supporting electrolyte that is, concentrations of Ln3+ and Yb3+ in formed films, was investigated. The upconversion PL intensity of ZrO2:Ln3+/Yb3+ films rises as Yb3+ concentration increases due to efficient energy transfer from Yb3+ to Ln3+. The emission color of Er3+ and Ho3+ in ZrO2:Er3+/Yb3+ and ZrO2:Ho3+/Yb3+ films, respectively, can be fine-tuned by adjusting the Yb3+ concentration. The ratios 4F9/2→4I15/2 / 4S3/2→4I15/2 of Er3+ and 5F4,5S2→5I8 / 5F5→5I8 of Ho3+ increase significantly with increasing Yb3+ content.
T2  - Upconversion Nanophosphors
T1  - Chapter 4 - Upconversion photoluminescence properties of ZrO2: Ln3+/Yb3+ (Ln = Er, Ho, Tm) films formed by plasma electrolytic oxidation
SP  - 103
EP  - 118
DO  - 10.1016/B978-0-12-822842-5.00001-7
ER  - 

@inbook{
author = "Ćirić, Aleksandar and Stojadinović, Stevan",
year = "2022",
abstract = "The highly-efficient upconversion photoluminescent ZrO2:Ln3+/Yb3+ (Ln = Er, Ho, Tm) films were prepared by the plasma electrolytic oxidation method from the pure zirconium foil, by adding Ln2O3 and Yb2O3 particles to the supporting electrolyte, in various concentrations. The method of synthesis, morphology, chemical, and phase composition of formed films were described and discussed. All the samples exhibit visible upconversion photoluminescence (PL) after 980 nm irradiation, which matches with the energy of the excited level of Yb3+. The upconversion PL mechanism and dependence of upconversion PL properties on Ln2O3 and Yb2O3 concentrations in supporting electrolyte that is, concentrations of Ln3+ and Yb3+ in formed films, was investigated. The upconversion PL intensity of ZrO2:Ln3+/Yb3+ films rises as Yb3+ concentration increases due to efficient energy transfer from Yb3+ to Ln3+. The emission color of Er3+ and Ho3+ in ZrO2:Er3+/Yb3+ and ZrO2:Ho3+/Yb3+ films, respectively, can be fine-tuned by adjusting the Yb3+ concentration. The ratios 4F9/2→4I15/2 / 4S3/2→4I15/2 of Er3+ and 5F4,5S2→5I8 / 5F5→5I8 of Ho3+ increase significantly with increasing Yb3+ content.",
journal = "Upconversion Nanophosphors",
booktitle = "Chapter 4 - Upconversion photoluminescence properties of ZrO2: Ln3+/Yb3+ (Ln = Er, Ho, Tm) films formed by plasma electrolytic oxidation",
pages = "103-118",
doi = "10.1016/B978-0-12-822842-5.00001-7"
}

Ćirić, A.,& Stojadinović, S.. (2022). Chapter 4 - Upconversion photoluminescence properties of ZrO2: Ln3+/Yb3+ (Ln = Er, Ho, Tm) films formed by plasma electrolytic oxidation. in Upconversion Nanophosphors, 103-118.
https://doi.org/10.1016/B978-0-12-822842-5.00001-7

Ćirić A, Stojadinović S. Chapter 4 - Upconversion photoluminescence properties of ZrO2: Ln3+/Yb3+ (Ln = Er, Ho, Tm) films formed by plasma electrolytic oxidation. in Upconversion Nanophosphors. 2022;:103-118.
doi:10.1016/B978-0-12-822842-5.00001-7 .

Ćirić, Aleksandar, Stojadinović, Stevan, "Chapter 4 - Upconversion photoluminescence properties of ZrO2: Ln3+/Yb3+ (Ln = Er, Ho, Tm) films formed by plasma electrolytic oxidation" in Upconversion Nanophosphors (2022):103-118,
https://doi.org/10.1016/B978-0-12-822842-5.00001-7 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Stojadinović, Stevan
AU  - Ristić, Zoran
AU  - Antić, Željka
AU  - Dramićanin, Miroslav
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9883
AB  - Thermographic properties of Cr3+-doped Al2O3 coatings created by plasma electrolytic oxidation (PEO) are investigated. Scanning electron microscopy revealed dense coatings uniformly distributed over the aluminum surface with uniform elemental maps, confirming homogeneous distribution of chromium ions. X-ray diffraction analysis shows that created coatings consist of a mixture of alpha and gamma phase of alumina and that alpha-to-gamma phase ratio increases with PEO processing time. Room-temperature photoluminescent measurements revealed two deep-red, sharp emissions placed at 694 nm (R1 line) and 693 nm (R2 line) typical for Cr3+ in Al2O3 octahedral configuration. No evidence of broad 680−800 nm emission typical for alumina gamma phase is observed and emissions were predominantly attributed to the ruby α-Al2O3:Cr3+. The temperature is obtained from the coating’s emission using temperature-induced changes in: i) band shift of the R1 line, (ii) luminescence intensity ratio (LIR) between two Cr3+ R1,2 lines, and (iii) lifetime of the Cr3+ red emission with maximal sensitivities of 0.2 cm−1 K−1 @ 550 K, 4.8 % K−1 @ 20 K and 0.9 % K−1 @ 450 K, respectively.
T2  - Sensors and Actuators A: Physical
T1  - Temperature sensing using ruby coatings created by plasma electrolytic oxidation
VL  - 331
SP  - 112987
DO  - 10.1016/j.sna.2021.112987
ER  - 

@article{
author = "Ćirić, Aleksandar and Stojadinović, Stevan and Ristić, Zoran and Antić, Željka and Dramićanin, Miroslav",
year = "2021",
abstract = "Thermographic properties of Cr3+-doped Al2O3 coatings created by plasma electrolytic oxidation (PEO) are investigated. Scanning electron microscopy revealed dense coatings uniformly distributed over the aluminum surface with uniform elemental maps, confirming homogeneous distribution of chromium ions. X-ray diffraction analysis shows that created coatings consist of a mixture of alpha and gamma phase of alumina and that alpha-to-gamma phase ratio increases with PEO processing time. Room-temperature photoluminescent measurements revealed two deep-red, sharp emissions placed at 694 nm (R1 line) and 693 nm (R2 line) typical for Cr3+ in Al2O3 octahedral configuration. No evidence of broad 680−800 nm emission typical for alumina gamma phase is observed and emissions were predominantly attributed to the ruby α-Al2O3:Cr3+. The temperature is obtained from the coating’s emission using temperature-induced changes in: i) band shift of the R1 line, (ii) luminescence intensity ratio (LIR) between two Cr3+ R1,2 lines, and (iii) lifetime of the Cr3+ red emission with maximal sensitivities of 0.2 cm−1 K−1 @ 550 K, 4.8 % K−1 @ 20 K and 0.9 % K−1 @ 450 K, respectively.",
journal = "Sensors and Actuators A: Physical",
title = "Temperature sensing using ruby coatings created by plasma electrolytic oxidation",
volume = "331",
pages = "112987",
doi = "10.1016/j.sna.2021.112987"
}

Ćirić, A., Stojadinović, S., Ristić, Z., Antić, Ž.,& Dramićanin, M.. (2021). Temperature sensing using ruby coatings created by plasma electrolytic oxidation. in Sensors and Actuators A: Physical, 331, 112987.
https://doi.org/10.1016/j.sna.2021.112987

Ćirić A, Stojadinović S, Ristić Z, Antić Ž, Dramićanin M. Temperature sensing using ruby coatings created by plasma electrolytic oxidation. in Sensors and Actuators A: Physical. 2021;331:112987.
doi:10.1016/j.sna.2021.112987 .

Ćirić, Aleksandar, Stojadinović, Stevan, Ristić, Zoran, Antić, Željka, Dramićanin, Miroslav, "Temperature sensing using ruby coatings created by plasma electrolytic oxidation" in Sensors and Actuators A: Physical, 331 (2021):112987,
https://doi.org/10.1016/j.sna.2021.112987 . .

TY  - JOUR
AU  - Magić, Marko
AU  - Čolović, Božana M.
AU  - Vasilijić, Saša
AU  - Tadić, Nenad
AU  - Stojadinović, Stevan
AU  - Jokanović, Vukoman R.
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10041
AB  - The titanium implant was treated with plasma electrolytic oxidation and subsequent ionic exchange and thermal treatment in order to obtain bioactive layer consisting of titanium oxide, calcium and sodium titanates and hydroxyapatite, as confirmed by X-ray diffraction (XRD). Scanning electron microscopy (SEM) revealed that the given method, besides corresponding phase composition, enables suitable nanotopology for cell attachment and proliferation. Cytotoxicity investigations by MTT, LDH and propidium iodide assays and light microscopy showed that these coatings were not toxic to L929 cells.
T2  - Journal of Applied Biomaterials & Functional Materials
T1  - Nanodesigned coatings obtained by plasma electrolytic oxidation of titanium implant and their cytotoxicity
VL  - 19
DO  - 10.1177/2280800018822252
ER  - 

@article{
author = "Magić, Marko and Čolović, Božana M. and Vasilijić, Saša and Tadić, Nenad and Stojadinović, Stevan and Jokanović, Vukoman R.",
year = "2021",
abstract = "The titanium implant was treated with plasma electrolytic oxidation and subsequent ionic exchange and thermal treatment in order to obtain bioactive layer consisting of titanium oxide, calcium and sodium titanates and hydroxyapatite, as confirmed by X-ray diffraction (XRD). Scanning electron microscopy (SEM) revealed that the given method, besides corresponding phase composition, enables suitable nanotopology for cell attachment and proliferation. Cytotoxicity investigations by MTT, LDH and propidium iodide assays and light microscopy showed that these coatings were not toxic to L929 cells.",
journal = "Journal of Applied Biomaterials & Functional Materials",
title = "Nanodesigned coatings obtained by plasma electrolytic oxidation of titanium implant and their cytotoxicity",
volume = "19",
doi = "10.1177/2280800018822252"
}

Magić, M., Čolović, B. M., Vasilijić, S., Tadić, N., Stojadinović, S.,& Jokanović, V. R.. (2021). Nanodesigned coatings obtained by plasma electrolytic oxidation of titanium implant and their cytotoxicity. in Journal of Applied Biomaterials & Functional Materials, 19.
https://doi.org/10.1177/2280800018822252

Magić M, Čolović BM, Vasilijić S, Tadić N, Stojadinović S, Jokanović VR. Nanodesigned coatings obtained by plasma electrolytic oxidation of titanium implant and their cytotoxicity. in Journal of Applied Biomaterials & Functional Materials. 2021;19.
doi:10.1177/2280800018822252 .

Magić, Marko, Čolović, Božana M., Vasilijić, Saša, Tadić, Nenad, Stojadinović, Stevan, Jokanović, Vukoman R., "Nanodesigned coatings obtained by plasma electrolytic oxidation of titanium implant and their cytotoxicity" in Journal of Applied Biomaterials & Functional Materials, 19 (2021),
https://doi.org/10.1177/2280800018822252 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Stojadinović, Stevan
AU  - Ristić, Zoran
AU  - Zeković, Ivana Lj.
AU  - Kuzman, Sanja
AU  - Antić, Željka
AU  - Dramićanin, Miroslav
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9140
AB  - The introduction of additional functionalities to materials is exceptionally important as it opens new applications for them. Aluminum, one of the most abundant and important materials, is coated with luminescent Sm2+-doped γ-aluminium oxide to impart thermometric functionality. Considering the potential industrial applications, two of the most widely used aluminum alloys, 6061 and 7075, are also coated. For this purpose, plasma electrolytic oxidation (PEO), an effective technique for producing hard ceramic coatings on various metal surfaces, is used. It is shown that thermometric coatings can be produced on aluminum in one-step process by adding the raw precursor to the electrolyte. The valence reduction of Ln3+ to Ln2+ is achieved during the PEO process. The intense and broad (orange to deep red) emission from the coating shows supersensitivity to temperature changes over the 100–648 K range. The temperature is obtained from the coating emission using i) the emission intensity ratio method, ii) emission lifetime, and iii) emission band position with sensitivities of 4.8% K−1, 1.2% K−1, and 8 cm−1 K−1, respectively. Several applications would benefit from the thermometric coating's excellent temperature resolution of 0.04 K and the choice of three temperature read-outs that facilitate the coating's use in different luminescence thermometry setups. © 2021 Wiley-VCH GmbH
T2  - Advanced Materials Technologies
T1  - Supersensitive Sm2+ ‐Activated Al2O3 Thermometric Coatings for High‐Resolution Multiple Temperature Read‐Outs from Luminescence
VL  - 6
IS  - 4
SP  - 2001201
DO  - 10.1002/admt.202001201
ER  - 

@article{
author = "Ćirić, Aleksandar and Stojadinović, Stevan and Ristić, Zoran and Zeković, Ivana Lj. and Kuzman, Sanja and Antić, Željka and Dramićanin, Miroslav",
year = "2021",
abstract = "The introduction of additional functionalities to materials is exceptionally important as it opens new applications for them. Aluminum, one of the most abundant and important materials, is coated with luminescent Sm2+-doped γ-aluminium oxide to impart thermometric functionality. Considering the potential industrial applications, two of the most widely used aluminum alloys, 6061 and 7075, are also coated. For this purpose, plasma electrolytic oxidation (PEO), an effective technique for producing hard ceramic coatings on various metal surfaces, is used. It is shown that thermometric coatings can be produced on aluminum in one-step process by adding the raw precursor to the electrolyte. The valence reduction of Ln3+ to Ln2+ is achieved during the PEO process. The intense and broad (orange to deep red) emission from the coating shows supersensitivity to temperature changes over the 100–648 K range. The temperature is obtained from the coating emission using i) the emission intensity ratio method, ii) emission lifetime, and iii) emission band position with sensitivities of 4.8% K−1, 1.2% K−1, and 8 cm−1 K−1, respectively. Several applications would benefit from the thermometric coating's excellent temperature resolution of 0.04 K and the choice of three temperature read-outs that facilitate the coating's use in different luminescence thermometry setups. © 2021 Wiley-VCH GmbH",
journal = "Advanced Materials Technologies",
title = "Supersensitive Sm2+ ‐Activated Al2O3 Thermometric Coatings for High‐Resolution Multiple Temperature Read‐Outs from Luminescence",
volume = "6",
number = "4",
pages = "2001201",
doi = "10.1002/admt.202001201"
}

Ćirić, A., Stojadinović, S., Ristić, Z., Zeković, I. Lj., Kuzman, S., Antić, Ž.,& Dramićanin, M.. (2021). Supersensitive Sm2+ ‐Activated Al2O3 Thermometric Coatings for High‐Resolution Multiple Temperature Read‐Outs from Luminescence. in Advanced Materials Technologies, 6(4), 2001201.
https://doi.org/10.1002/admt.202001201

Ćirić A, Stojadinović S, Ristić Z, Zeković IL, Kuzman S, Antić Ž, Dramićanin M. Supersensitive Sm2+ ‐Activated Al2O3 Thermometric Coatings for High‐Resolution Multiple Temperature Read‐Outs from Luminescence. in Advanced Materials Technologies. 2021;6(4):2001201.
doi:10.1002/admt.202001201 .

Ćirić, Aleksandar, Stojadinović, Stevan, Ristić, Zoran, Zeković, Ivana Lj., Kuzman, Sanja, Antić, Željka, Dramićanin, Miroslav, "Supersensitive Sm2+ ‐Activated Al2O3 Thermometric Coatings for High‐Resolution Multiple Temperature Read‐Outs from Luminescence" in Advanced Materials Technologies, 6, no. 4 (2021):2001201,
https://doi.org/10.1002/admt.202001201 . .

TY  - JOUR
AU  - Stojadinović, Stevan
AU  - Ćirić, Aleksandar
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9135
AB  - Eu3+ and Tb3+ doped ZnO optical coatings were formed by the Plasma Electrolytic Oxidation (PEO) method from the pure Zn sheet, with various dopant concentrations. The morphologies show no significant change with the introduced dopant or their concentrations, with typical appearance of PEO formed coatings. All elements are uniformly distributed, and concentration of incorporated dopants is related to the concentrations of the Eu2O3 or Tb4O7 particles added to the basic electrolyte. Wurtzite structure of ZnO was identified in all the samples, with no change induced by the dopants. Under 260 nm excitation ZnO emits broad-band in the visible region attributed to oxygen interstitial defects and oxygen vacancies. Photoluminescence (PL) of ZnO:X3+ (X = Eu, Tb) is a sum of PL from ZnO and 4f–4f dopant emissions. Eu3+ and Tb3+ are most effectively excited in charge-transfer band and 4f5d levels, respectively. By increasing concentrations of the dopants the broad PL decreases in favor of the 4f–4f dopant transitions, an indication of the energy transfer. ZnO:Eu3+ spectra are dominated by the hypersensitive 5D0→7F2 transition. Eu3+ ions are incorporated in a highly asymmetric environment. PL emission at 541 nm is the most intense in ZnO:Tb3+. Judd-Ofelt intensity parameters rise with increasing Eu3+ concentration, up to Ω2 = 7.8·10−42 cm2 and Ω4 = 4.4·10−42 cm2. Radiative lifetime of 5D0 level drops to 1.12 ms. Chromaticity of PL varies with concentration only when the samples are irradiated by UV light, from white to orange-red or green for Eu3+ or Tb3+ doped samples, respectively. Eu3+ under 394 nm and 464 nm irradiation gives 99.5% color-purity. © 2021 Elsevier B.V.
T2  - Journal of Luminescence
T1  - Photoluminescence of ZnO:Eu3+ and ZnO:Tb3+ coatings formed by plasma electrolytic oxidation of pure zinc substrate
VL  - 235
SP  - 118022
DO  - 10.1016/j.jlumin.2021.118022
ER  - 

@article{
author = "Stojadinović, Stevan and Ćirić, Aleksandar",
year = "2021",
abstract = "Eu3+ and Tb3+ doped ZnO optical coatings were formed by the Plasma Electrolytic Oxidation (PEO) method from the pure Zn sheet, with various dopant concentrations. The morphologies show no significant change with the introduced dopant or their concentrations, with typical appearance of PEO formed coatings. All elements are uniformly distributed, and concentration of incorporated dopants is related to the concentrations of the Eu2O3 or Tb4O7 particles added to the basic electrolyte. Wurtzite structure of ZnO was identified in all the samples, with no change induced by the dopants. Under 260 nm excitation ZnO emits broad-band in the visible region attributed to oxygen interstitial defects and oxygen vacancies. Photoluminescence (PL) of ZnO:X3+ (X = Eu, Tb) is a sum of PL from ZnO and 4f–4f dopant emissions. Eu3+ and Tb3+ are most effectively excited in charge-transfer band and 4f5d levels, respectively. By increasing concentrations of the dopants the broad PL decreases in favor of the 4f–4f dopant transitions, an indication of the energy transfer. ZnO:Eu3+ spectra are dominated by the hypersensitive 5D0→7F2 transition. Eu3+ ions are incorporated in a highly asymmetric environment. PL emission at 541 nm is the most intense in ZnO:Tb3+. Judd-Ofelt intensity parameters rise with increasing Eu3+ concentration, up to Ω2 = 7.8·10−42 cm2 and Ω4 = 4.4·10−42 cm2. Radiative lifetime of 5D0 level drops to 1.12 ms. Chromaticity of PL varies with concentration only when the samples are irradiated by UV light, from white to orange-red or green for Eu3+ or Tb3+ doped samples, respectively. Eu3+ under 394 nm and 464 nm irradiation gives 99.5% color-purity. © 2021 Elsevier B.V.",
journal = "Journal of Luminescence",
title = "Photoluminescence of ZnO:Eu3+ and ZnO:Tb3+ coatings formed by plasma electrolytic oxidation of pure zinc substrate",
volume = "235",
pages = "118022",
doi = "10.1016/j.jlumin.2021.118022"
}

Stojadinović, S.,& Ćirić, A.. (2021). Photoluminescence of ZnO:Eu3+ and ZnO:Tb3+ coatings formed by plasma electrolytic oxidation of pure zinc substrate. in Journal of Luminescence, 235, 118022.
https://doi.org/10.1016/j.jlumin.2021.118022

Stojadinović S, Ćirić A. Photoluminescence of ZnO:Eu3+ and ZnO:Tb3+ coatings formed by plasma electrolytic oxidation of pure zinc substrate. in Journal of Luminescence. 2021;235:118022.
doi:10.1016/j.jlumin.2021.118022 .

Stojadinović, Stevan, Ćirić, Aleksandar, "Photoluminescence of ZnO:Eu3+ and ZnO:Tb3+ coatings formed by plasma electrolytic oxidation of pure zinc substrate" in Journal of Luminescence, 235 (2021):118022,
https://doi.org/10.1016/j.jlumin.2021.118022 . .

TY  - JOUR
AU  - Stojadinović, Stevan
AU  - Ćirić, Aleksandar
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9911
AB  - Mn2+ single doped as well as Mn2+/Eu2+ and Mn2+/Ce3+ co-doped Al2O3 coatings were synthesized by plasma electrolytic oxidation process of aluminum and their structural, morphological, and above all, photoluminescence (PL) properties were investigated in deep. Al2O3:Mn2+ coatings exhibit a weak green PL emission centered at about 525 nm attributed to 4T1 → 6A1 forbidden transition of Mn2+. Under middle UV excitation, Eu2+ or Ce3+ single doped Al2O3 coatings show strong and broad PL emission mostly in range from 300 to 550 nm. Due to the overlap between the PL emission of Eu2+ or Ce3+ and the PL excitation of Mn2+ in Al2O3, efficient Eu2+  → Mn2+ and Ce3+  → Mn2+ energy transfer upon middle UV excitation was observed in Al2O3:Mn2+/Eu2+ and Al2O3:Mn2+/Ce3+, respectively. PL emission intensities of Mn2+ in Al2O3:Mn2+/Eu2+ and Al2O3:Mn2+/Ce3+ is two to three orders of magnitude larger than in Al2O3:Mn2+.
T2  - Journal of Materials Science: Materials in Electronics
T1  - Highly enhanced green emission of Mn2+ in Al2O3 coatings formed by plasma electrolytic oxidation via efficient Eu2+  → Mn2+ and Ce3+  → Mn2+ energy transfer
VL  - 32
IS  - 18
SP  - 23472
EP  - 23485
DO  - 10.1007/s10854-021-06836-z
ER  - 

@article{
author = "Stojadinović, Stevan and Ćirić, Aleksandar",
year = "2021",
abstract = "Mn2+ single doped as well as Mn2+/Eu2+ and Mn2+/Ce3+ co-doped Al2O3 coatings were synthesized by plasma electrolytic oxidation process of aluminum and their structural, morphological, and above all, photoluminescence (PL) properties were investigated in deep. Al2O3:Mn2+ coatings exhibit a weak green PL emission centered at about 525 nm attributed to 4T1 → 6A1 forbidden transition of Mn2+. Under middle UV excitation, Eu2+ or Ce3+ single doped Al2O3 coatings show strong and broad PL emission mostly in range from 300 to 550 nm. Due to the overlap between the PL emission of Eu2+ or Ce3+ and the PL excitation of Mn2+ in Al2O3, efficient Eu2+  → Mn2+ and Ce3+  → Mn2+ energy transfer upon middle UV excitation was observed in Al2O3:Mn2+/Eu2+ and Al2O3:Mn2+/Ce3+, respectively. PL emission intensities of Mn2+ in Al2O3:Mn2+/Eu2+ and Al2O3:Mn2+/Ce3+ is two to three orders of magnitude larger than in Al2O3:Mn2+.",
journal = "Journal of Materials Science: Materials in Electronics",
title = "Highly enhanced green emission of Mn2+ in Al2O3 coatings formed by plasma electrolytic oxidation via efficient Eu2+  → Mn2+ and Ce3+  → Mn2+ energy transfer",
volume = "32",
number = "18",
pages = "23472-23485",
doi = "10.1007/s10854-021-06836-z"
}

Stojadinović, S.,& Ćirić, A.. (2021). Highly enhanced green emission of Mn2+ in Al2O3 coatings formed by plasma electrolytic oxidation via efficient Eu2+  → Mn2+ and Ce3+  → Mn2+ energy transfer. in Journal of Materials Science: Materials in Electronics, 32(18), 23472-23485.
https://doi.org/10.1007/s10854-021-06836-z

Stojadinović S, Ćirić A. Highly enhanced green emission of Mn2+ in Al2O3 coatings formed by plasma electrolytic oxidation via efficient Eu2+  → Mn2+ and Ce3+  → Mn2+ energy transfer. in Journal of Materials Science: Materials in Electronics. 2021;32(18):23472-23485.
doi:10.1007/s10854-021-06836-z .

Stojadinović, Stevan, Ćirić, Aleksandar, "Highly enhanced green emission of Mn2+ in Al2O3 coatings formed by plasma electrolytic oxidation via efficient Eu2+  → Mn2+ and Ce3+  → Mn2+ energy transfer" in Journal of Materials Science: Materials in Electronics, 32, no. 18 (2021):23472-23485,
https://doi.org/10.1007/s10854-021-06836-z . .

TY  - JOUR
AU  - Rajić, Vladimir
AU  - Simatović Stojković, Ivana
AU  - Veselinović, Ljiljana M.
AU  - Belošević-Čavor, Jelena
AU  - Novaković, Mirjana M.
AU  - Popović, Maja
AU  - Škapin, Srečo Davor
AU  - Mojović, Miloš
AU  - Stojadinović, Stevan
AU  - Rac, Vladislav
AU  - Častvan Janković, Ivona
AU  - Marković, Smilja
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9679
AB  - Eco-friendly and rapid microwave processing of a precipitate was used to produce Fe-doped zinc oxide (Zn1−xFexO, x = 0, 0.05, 0.1, 0.15 and 0.20; ZnO:Fe) nanoparticles, which were tested as catalysts toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a moderately alkaline solution. The phase composition, crystal structure, morphology, textural properties, surface chemistry, optical properties and band structure were examined to comprehend the influence of Zn2+ partial substitution with Fe3+ on the catalytic activity of ZnO:Fe. Linear sweep voltammetry showed an improved catalytic activity of ZnO:5Fe toward the ORR, compared to pure ZnO, while with increased amounts of the Fe-dopant the activity decreased. The improvement was suggested by a more positive onset potential (0.394 V vs. RHE), current density (0.231 mA cm−2 at 0.150 V vs. RHE), and faster kinetics (Tafel slope, b = 248 mV dec−1), and it may be due to the synergistic effect of (1) a sufficient amount of surface oxygen vacancies, and (2) a certain amount of plate-like particles composed of crystallites with well developed (0001) and (000) facets. Quite the contrary, the OER study showed that the introduction of Fe3+ ions into the ZnO crystal structure resulted in enhanced catalytic activity of all ZnO:Fe samples, compared to pure ZnO, probably due to the modified binding energy and an optimized band structure. With the maximal current density of 1.066 mA cm−2 at 2.216 V vs. RHE, an onset potential of 1.856 V vs. RHE, and the smallest potential difference between the OER and ORR (ΔE = 1.58 V), ZnO:10Fe may be considered a promising bifunctional catalyst toward the OER/ORR in moderately alkaline solution. This study demonstrates that the electrocatalytic activity of ZnO:Fe strongly depends on the defect chemistry and consequently the band structure. Along with providing fundamental insight into the electrocatalytic activity of ZnO:Fe, the study also indicates an optimal stoichiometry for enhanced bifunctional activity toward the OER/ORR, compared to pure ZnO.
T2  - Physical Chemistry Chemical Physics
T1  - Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry
VL  - 22
IS  - 38
SP  - 22078
EP  - 22095
DO  - 10.1039/D0CP03377D
ER  - 

@article{
author = "Rajić, Vladimir and Simatović Stojković, Ivana and Veselinović, Ljiljana M. and Belošević-Čavor, Jelena and Novaković, Mirjana M. and Popović, Maja and Škapin, Srečo Davor and Mojović, Miloš and Stojadinović, Stevan and Rac, Vladislav and Častvan Janković, Ivona and Marković, Smilja",
year = "2020",
abstract = "Eco-friendly and rapid microwave processing of a precipitate was used to produce Fe-doped zinc oxide (Zn1−xFexO, x = 0, 0.05, 0.1, 0.15 and 0.20; ZnO:Fe) nanoparticles, which were tested as catalysts toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in a moderately alkaline solution. The phase composition, crystal structure, morphology, textural properties, surface chemistry, optical properties and band structure were examined to comprehend the influence of Zn2+ partial substitution with Fe3+ on the catalytic activity of ZnO:Fe. Linear sweep voltammetry showed an improved catalytic activity of ZnO:5Fe toward the ORR, compared to pure ZnO, while with increased amounts of the Fe-dopant the activity decreased. The improvement was suggested by a more positive onset potential (0.394 V vs. RHE), current density (0.231 mA cm−2 at 0.150 V vs. RHE), and faster kinetics (Tafel slope, b = 248 mV dec−1), and it may be due to the synergistic effect of (1) a sufficient amount of surface oxygen vacancies, and (2) a certain amount of plate-like particles composed of crystallites with well developed (0001) and (000) facets. Quite the contrary, the OER study showed that the introduction of Fe3+ ions into the ZnO crystal structure resulted in enhanced catalytic activity of all ZnO:Fe samples, compared to pure ZnO, probably due to the modified binding energy and an optimized band structure. With the maximal current density of 1.066 mA cm−2 at 2.216 V vs. RHE, an onset potential of 1.856 V vs. RHE, and the smallest potential difference between the OER and ORR (ΔE = 1.58 V), ZnO:10Fe may be considered a promising bifunctional catalyst toward the OER/ORR in moderately alkaline solution. This study demonstrates that the electrocatalytic activity of ZnO:Fe strongly depends on the defect chemistry and consequently the band structure. Along with providing fundamental insight into the electrocatalytic activity of ZnO:Fe, the study also indicates an optimal stoichiometry for enhanced bifunctional activity toward the OER/ORR, compared to pure ZnO.",
journal = "Physical Chemistry Chemical Physics",
title = "Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry",
volume = "22",
number = "38",
pages = "22078-22095",
doi = "10.1039/D0CP03377D"
}

Rajić, V., Simatović Stojković, I., Veselinović, L. M., Belošević-Čavor, J., Novaković, M. M., Popović, M., Škapin, S. D., Mojović, M., Stojadinović, S., Rac, V., Častvan Janković, I.,& Marković, S.. (2020). Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry. in Physical Chemistry Chemical Physics, 22(38), 22078-22095.
https://doi.org/10.1039/D0CP03377D

Rajić V, Simatović Stojković I, Veselinović LM, Belošević-Čavor J, Novaković MM, Popović M, Škapin SD, Mojović M, Stojadinović S, Rac V, Častvan Janković I, Marković S. Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry. in Physical Chemistry Chemical Physics. 2020;22(38):22078-22095.
doi:10.1039/D0CP03377D .

Rajić, Vladimir, Simatović Stojković, Ivana, Veselinović, Ljiljana M., Belošević-Čavor, Jelena, Novaković, Mirjana M., Popović, Maja, Škapin, Srečo Davor, Mojović, Miloš, Stojadinović, Stevan, Rac, Vladislav, Častvan Janković, Ivona, Marković, Smilja, "Bifunctional catalytic activity of Zn1−xFexO toward the OER/ORR: seeking an optimal stoichiometry" in Physical Chemistry Chemical Physics, 22, no. 38 (2020):22078-22095,
https://doi.org/10.1039/D0CP03377D . .

TY  - JOUR
AU  - Savić-Biserčić, Marjetka
AU  - Marjanović, Budimir
AU  - Zasonska, Beata A.
AU  - Stojadinović, Stevan
AU  - Ćirić-Marjanović, Gordana N.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8847
AB  - Composites of metal organic framework MOF-5 and conjugated polymer polyaniline (PANI) were synthesized for the first time. Two procedures, which avoid humidity during the synthesis in order to preserve the structure of MOF-5, were applied. In the first one, dissolved part of nonconducting emeraldine base form of PANI (PANI-EB) in N,N΄-dimethylformamide was mixed with MOF-5 in different mass ratios. In the second one, the composites were prepared mechano-chemically, by using powdered conducting emeraldine salt form of PANI (PANI-ES) and solid MOF-5, mixed in chloroform in different mass ratios. The composites were characterized by various techniques: scanning electron microscopy (SEM), FTIR spectroscopy, nitrogen sorption and electrical conductivity measurements, XRD, and flame atomic absorption spectroscopy (FAAS). The procedure which used PANI-EB led to microporous PANI/MOF-5 composites with very high BET specific surface area, SBET (the highest value SBET of c.a. 2700 m2 g−1, even higher than SBET of starting pure MOF-5, showed the composite which contains 89 wt.% of MOF-5) and low conductivity (∼10-7 S cm−1). The second procedure which used PANI-ES gave microporous PANI/MOF-5 composites which showed moderate conductivities (the highest conductivity of 1.0 ⋅ 10−3 S cm-1 exhibited the composite which contains 25 wt.% of MOF-5) and also high SBET values, but lower than those measured for the composites with PANI-EB (the highest SBET of c.a. 850 m2 g-1 showed the composite of PANI doped with HCl which contains c.a. 77 wt.% of MOF-5). XRD measurements confirmed that predominately cubic crystalline structure of MOF-5 was present in almost all composites. © 2020 Elsevier B.V.
T2  - Synthetic Metals
T1  - Novel microporous composites of MOF-5 and polyaniline with high specific surface area
VL  - 262
SP  - 116348
DO  - 10.1016/j.synthmet.2020.116348
ER  - 

@article{
author = "Savić-Biserčić, Marjetka and Marjanović, Budimir and Zasonska, Beata A. and Stojadinović, Stevan and Ćirić-Marjanović, Gordana N.",
year = "2020",
abstract = "Composites of metal organic framework MOF-5 and conjugated polymer polyaniline (PANI) were synthesized for the first time. Two procedures, which avoid humidity during the synthesis in order to preserve the structure of MOF-5, were applied. In the first one, dissolved part of nonconducting emeraldine base form of PANI (PANI-EB) in N,N΄-dimethylformamide was mixed with MOF-5 in different mass ratios. In the second one, the composites were prepared mechano-chemically, by using powdered conducting emeraldine salt form of PANI (PANI-ES) and solid MOF-5, mixed in chloroform in different mass ratios. The composites were characterized by various techniques: scanning electron microscopy (SEM), FTIR spectroscopy, nitrogen sorption and electrical conductivity measurements, XRD, and flame atomic absorption spectroscopy (FAAS). The procedure which used PANI-EB led to microporous PANI/MOF-5 composites with very high BET specific surface area, SBET (the highest value SBET of c.a. 2700 m2 g−1, even higher than SBET of starting pure MOF-5, showed the composite which contains 89 wt.% of MOF-5) and low conductivity (∼10-7 S cm−1). The second procedure which used PANI-ES gave microporous PANI/MOF-5 composites which showed moderate conductivities (the highest conductivity of 1.0 ⋅ 10−3 S cm-1 exhibited the composite which contains 25 wt.% of MOF-5) and also high SBET values, but lower than those measured for the composites with PANI-EB (the highest SBET of c.a. 850 m2 g-1 showed the composite of PANI doped with HCl which contains c.a. 77 wt.% of MOF-5). XRD measurements confirmed that predominately cubic crystalline structure of MOF-5 was present in almost all composites. © 2020 Elsevier B.V.",
journal = "Synthetic Metals",
title = "Novel microporous composites of MOF-5 and polyaniline with high specific surface area",
volume = "262",
pages = "116348",
doi = "10.1016/j.synthmet.2020.116348"
}

Savić-Biserčić, M., Marjanović, B., Zasonska, B. A., Stojadinović, S.,& Ćirić-Marjanović, G. N.. (2020). Novel microporous composites of MOF-5 and polyaniline with high specific surface area. in Synthetic Metals, 262, 116348.
https://doi.org/10.1016/j.synthmet.2020.116348

Savić-Biserčić M, Marjanović B, Zasonska BA, Stojadinović S, Ćirić-Marjanović GN. Novel microporous composites of MOF-5 and polyaniline with high specific surface area. in Synthetic Metals. 2020;262:116348.
doi:10.1016/j.synthmet.2020.116348 .

Savić-Biserčić, Marjetka, Marjanović, Budimir, Zasonska, Beata A., Stojadinović, Stevan, Ćirić-Marjanović, Gordana N., "Novel microporous composites of MOF-5 and polyaniline with high specific surface area" in Synthetic Metals, 262 (2020):116348,
https://doi.org/10.1016/j.synthmet.2020.116348 . .

TY  - JOUR
AU  - Vasiljević, Zorka
AU  - Dojčinović, Milena
AU  - Vujančević, Jelena
AU  - Janković-Častvan, Ivona
AU  - Ognjanović, Miloš
AU  - Tadić, Nenad B.
AU  - Stojadinović, Stevan
AU  - Branković, Goran O.
AU  - Nikolić, Maria Vesna
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9706
AB  - The aim of this work was to synthesize semiconducting oxide nanoparticles using a simple method with low production cost to be applied in natural sunlight for photocatalytic degradation of pollutants in waste water. Iron titanate (Fe2TiO5) nanoparticles with an orthorhombic structure were successfully synthesized using a modified sol–gel method and calcination at 750°C. The as-prepared Fe2TiO5 nanoparticles exhibited a moderate specific surface area. The mesoporous Fe2TiO5 nanoparticles possessed strong absorption in the visible-light region and the band gap was estimated to be around 2.16 eV. The photocatalytic activity was evaluated by the degradation of methylene blue under natural sunlight. The effect of parameters such as the amount of catalyst, initial concentration of the dye and pH of the dye solution on the removal efficiency of methylene blue was investigated. Fe2TiO5 showed high degradation efficiency in a strong alkaline medium that can be the result of the facilitated formation of OH radicals due to an increased concentration of hydroxyl ions.
T2  - Royal Society Open Science
T1  - Photocatalytic degradation of methylene blue under natural sunlight using iron titanate nanoparticles prepared by a modified sol–gel method
VL  - 7
IS  - 9
SP  - 200708
DO  - 10.1098/rsos.200708
ER  - 

@article{
author = "Vasiljević, Zorka and Dojčinović, Milena and Vujančević, Jelena and Janković-Častvan, Ivona and Ognjanović, Miloš and Tadić, Nenad B. and Stojadinović, Stevan and Branković, Goran O. and Nikolić, Maria Vesna",
year = "2020",
abstract = "The aim of this work was to synthesize semiconducting oxide nanoparticles using a simple method with low production cost to be applied in natural sunlight for photocatalytic degradation of pollutants in waste water. Iron titanate (Fe2TiO5) nanoparticles with an orthorhombic structure were successfully synthesized using a modified sol–gel method and calcination at 750°C. The as-prepared Fe2TiO5 nanoparticles exhibited a moderate specific surface area. The mesoporous Fe2TiO5 nanoparticles possessed strong absorption in the visible-light region and the band gap was estimated to be around 2.16 eV. The photocatalytic activity was evaluated by the degradation of methylene blue under natural sunlight. The effect of parameters such as the amount of catalyst, initial concentration of the dye and pH of the dye solution on the removal efficiency of methylene blue was investigated. Fe2TiO5 showed high degradation efficiency in a strong alkaline medium that can be the result of the facilitated formation of OH radicals due to an increased concentration of hydroxyl ions.",
journal = "Royal Society Open Science",
title = "Photocatalytic degradation of methylene blue under natural sunlight using iron titanate nanoparticles prepared by a modified sol–gel method",
volume = "7",
number = "9",
pages = "200708",
doi = "10.1098/rsos.200708"
}

Vasiljević, Z., Dojčinović, M., Vujančević, J., Janković-Častvan, I., Ognjanović, M., Tadić, N. B., Stojadinović, S., Branković, G. O.,& Nikolić, M. V.. (2020). Photocatalytic degradation of methylene blue under natural sunlight using iron titanate nanoparticles prepared by a modified sol–gel method. in Royal Society Open Science, 7(9), 200708.
https://doi.org/10.1098/rsos.200708

Vasiljević Z, Dojčinović M, Vujančević J, Janković-Častvan I, Ognjanović M, Tadić NB, Stojadinović S, Branković GO, Nikolić MV. Photocatalytic degradation of methylene blue under natural sunlight using iron titanate nanoparticles prepared by a modified sol–gel method. in Royal Society Open Science. 2020;7(9):200708.
doi:10.1098/rsos.200708 .

Vasiljević, Zorka, Dojčinović, Milena, Vujančević, Jelena, Janković-Častvan, Ivona, Ognjanović, Miloš, Tadić, Nenad B., Stojadinović, Stevan, Branković, Goran O., Nikolić, Maria Vesna, "Photocatalytic degradation of methylene blue under natural sunlight using iron titanate nanoparticles prepared by a modified sol–gel method" in Royal Society Open Science, 7, no. 9 (2020):200708,
https://doi.org/10.1098/rsos.200708 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Stojadinović, Stevan
AU  - Dramićanin, Miroslav
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9060
AB  - The steady-state luminescence thermometry analysis was performed on thin-films of undoped Gd2O3 and Gd2O3 doped with Ho3+, Eu3+ and Er3+, created by the plasma electrolytic oxidation process. The experimental setup for luminescent measurements closely resembles the practical luminescent fiber-optic thermometer. The visible PL from Gd3+ was utilized for the luminescence intensity ratio method, exceling over the traditional method by using the thermally coupled levels, as it is superior by either better sensitivities, widened temperature range or improved temperature resolution. The relative uncertainty by our method is ~300 times lower @ 300 K for Gd2O3:Eu3+. The maximum relative sensitivities by the luminescence intensity ratio (LIR) of Gd2O3:Ho3+, Gd2O3:Eu3+ and Gd2O3:Er3+ are 0.12% @ 295 K, 0.44% @ 580 K and 1.1% @ 290 K, respectively. Line-shift showed a significant change solely for Eu3+ doped sample, by 0.076 cm−1 K−1. The full-width-half-maximum (FWHM) changes of undoped Gd2O3 and doped by Eu3+ at the high rate of 0.3 cm−1 K−1 @ 573 K and 0.53 cm−1 K−1 @ 300 K, respectively, but was marked impractical for other samples.
T2  - Ceramics International
T1  - Luminescence temperature sensing using thin-films of undoped Gd2O3 and doped with Ho3+, Eu3+ and Er3+ prepared by plasma electrolytic oxidation
VL  - 46
IS  - 14
SP  - 23223
EP  - 23231
DO  - 10.1016/j.ceramint.2020.06.106
ER  - 

@article{
author = "Ćirić, Aleksandar and Stojadinović, Stevan and Dramićanin, Miroslav",
year = "2020",
abstract = "The steady-state luminescence thermometry analysis was performed on thin-films of undoped Gd2O3 and Gd2O3 doped with Ho3+, Eu3+ and Er3+, created by the plasma electrolytic oxidation process. The experimental setup for luminescent measurements closely resembles the practical luminescent fiber-optic thermometer. The visible PL from Gd3+ was utilized for the luminescence intensity ratio method, exceling over the traditional method by using the thermally coupled levels, as it is superior by either better sensitivities, widened temperature range or improved temperature resolution. The relative uncertainty by our method is ~300 times lower @ 300 K for Gd2O3:Eu3+. The maximum relative sensitivities by the luminescence intensity ratio (LIR) of Gd2O3:Ho3+, Gd2O3:Eu3+ and Gd2O3:Er3+ are 0.12% @ 295 K, 0.44% @ 580 K and 1.1% @ 290 K, respectively. Line-shift showed a significant change solely for Eu3+ doped sample, by 0.076 cm−1 K−1. The full-width-half-maximum (FWHM) changes of undoped Gd2O3 and doped by Eu3+ at the high rate of 0.3 cm−1 K−1 @ 573 K and 0.53 cm−1 K−1 @ 300 K, respectively, but was marked impractical for other samples.",
journal = "Ceramics International",
title = "Luminescence temperature sensing using thin-films of undoped Gd2O3 and doped with Ho3+, Eu3+ and Er3+ prepared by plasma electrolytic oxidation",
volume = "46",
number = "14",
pages = "23223-23231",
doi = "10.1016/j.ceramint.2020.06.106"
}

Ćirić, A., Stojadinović, S.,& Dramićanin, M.. (2020). Luminescence temperature sensing using thin-films of undoped Gd2O3 and doped with Ho3+, Eu3+ and Er3+ prepared by plasma electrolytic oxidation. in Ceramics International, 46(14), 23223-23231.
https://doi.org/10.1016/j.ceramint.2020.06.106

Ćirić A, Stojadinović S, Dramićanin M. Luminescence temperature sensing using thin-films of undoped Gd2O3 and doped with Ho3+, Eu3+ and Er3+ prepared by plasma electrolytic oxidation. in Ceramics International. 2020;46(14):23223-23231.
doi:10.1016/j.ceramint.2020.06.106 .

Ćirić, Aleksandar, Stojadinović, Stevan, Dramićanin, Miroslav, "Luminescence temperature sensing using thin-films of undoped Gd2O3 and doped with Ho3+, Eu3+ and Er3+ prepared by plasma electrolytic oxidation" in Ceramics International, 46, no. 14 (2020):23223-23231,
https://doi.org/10.1016/j.ceramint.2020.06.106 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Stojadinović, Stevan
AU  - Brik, Mikhail G.
AU  - Dramićanin, Miroslav
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8496
AB  - Traditional applications of the Judd-Ofelt (JO) theory to the analysis of the Eu3+ optical spectra make use of the emission transitions originating from the 5D0 manifold. In the present paper, we report an alternative method of evaluating the JO intensity parameters from the Eu3+ emission spectra based on the 5D1 → 7F0,1 transitions. The reduced matrix elements of the unit tensor operators are re-calculated for the 5D0,1,2 → 7F0,1,…,6 Eu3+ transitions in the intermediate coupling approximation using the average electrostatic and spin-orbit coupling parameters. The suggested method was tested by analyzing the emission spectra of the Eu3+ doped GdAlO3, LaF3, NaYF4, Y2O3, ZrO2, YNbO4, ZBLA and PIGLZ hosts. It is shown that the developed method is more accurate for the hosts with relatively high 5D1 level population, which emphasizes its high potential and applicability. In addition to the JO analysis, the CIE chromaticity coordinates are calculated for the investigated spectra. © 2019 Elsevier B.V.
T2  - Chemical Physics
T1  - Judd-Ofelt parametrization from emission spectra: The case study of the Eu3+ 5D1 emitting level
VL  - 528
SP  - 110513
DO  - 10.1016/j.chemphys.2019.110513
ER  - 

@article{
author = "Ćirić, Aleksandar and Stojadinović, Stevan and Brik, Mikhail G. and Dramićanin, Miroslav",
year = "2020",
abstract = "Traditional applications of the Judd-Ofelt (JO) theory to the analysis of the Eu3+ optical spectra make use of the emission transitions originating from the 5D0 manifold. In the present paper, we report an alternative method of evaluating the JO intensity parameters from the Eu3+ emission spectra based on the 5D1 → 7F0,1 transitions. The reduced matrix elements of the unit tensor operators are re-calculated for the 5D0,1,2 → 7F0,1,…,6 Eu3+ transitions in the intermediate coupling approximation using the average electrostatic and spin-orbit coupling parameters. The suggested method was tested by analyzing the emission spectra of the Eu3+ doped GdAlO3, LaF3, NaYF4, Y2O3, ZrO2, YNbO4, ZBLA and PIGLZ hosts. It is shown that the developed method is more accurate for the hosts with relatively high 5D1 level population, which emphasizes its high potential and applicability. In addition to the JO analysis, the CIE chromaticity coordinates are calculated for the investigated spectra. © 2019 Elsevier B.V.",
journal = "Chemical Physics",
title = "Judd-Ofelt parametrization from emission spectra: The case study of the Eu3+ 5D1 emitting level",
volume = "528",
pages = "110513",
doi = "10.1016/j.chemphys.2019.110513"
}

Ćirić, A., Stojadinović, S., Brik, M. G.,& Dramićanin, M.. (2020). Judd-Ofelt parametrization from emission spectra: The case study of the Eu3+ 5D1 emitting level. in Chemical Physics, 528, 110513.
https://doi.org/10.1016/j.chemphys.2019.110513

Ćirić A, Stojadinović S, Brik MG, Dramićanin M. Judd-Ofelt parametrization from emission spectra: The case study of the Eu3+ 5D1 emitting level. in Chemical Physics. 2020;528:110513.
doi:10.1016/j.chemphys.2019.110513 .

Ćirić, Aleksandar, Stojadinović, Stevan, Brik, Mikhail G., Dramićanin, Miroslav, "Judd-Ofelt parametrization from emission spectra: The case study of the Eu3+ 5D1 emitting level" in Chemical Physics, 528 (2020):110513,
https://doi.org/10.1016/j.chemphys.2019.110513 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Stojadinović, Stevan
AU  - Dramićanin, Miroslav
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8745
AB  - Judd-Ofelt analysis has been performed from the photoluminescence emission spectra of Y2O3:Eu3+ with 3%, 1% and 0.1% doping concentration and YVO4:Eu3+ with 1% doping concentration, in temperature range from 40 °C to 460 °C. For precise calculation, an extended Sellmeier equation that accounts for the doping concentration and temperature dependence of the refractive index of Y2O3 doped with lanthanides is estimated. The temperature dependence of Ω2 and Ω4 parameters are fitted with quadratic and linear regression, respectively. Judd-Ofelt intensity parameters uniformly drop with increasing temperature, but at a different rate for different doping concentrations. From the Judd-Ofelt parameters radiative lifetimes and emission cross-sections were calculated. The cross-sections show a linear decrease with increasing temperature. © 2019 Elsevier B.V.
T2  - Physica B: Condensed Matter
T1  - Temperature and concentration dependent Judd-Ofelt analysis of Y2O3:Eu3+ and YVO4:Eu3+
VL  - 579
SP  - 411891
DO  - 10.1016/j.physb.2019.411891
ER  - 

@article{
author = "Ćirić, Aleksandar and Stojadinović, Stevan and Dramićanin, Miroslav",
year = "2020",
abstract = "Judd-Ofelt analysis has been performed from the photoluminescence emission spectra of Y2O3:Eu3+ with 3%, 1% and 0.1% doping concentration and YVO4:Eu3+ with 1% doping concentration, in temperature range from 40 °C to 460 °C. For precise calculation, an extended Sellmeier equation that accounts for the doping concentration and temperature dependence of the refractive index of Y2O3 doped with lanthanides is estimated. The temperature dependence of Ω2 and Ω4 parameters are fitted with quadratic and linear regression, respectively. Judd-Ofelt intensity parameters uniformly drop with increasing temperature, but at a different rate for different doping concentrations. From the Judd-Ofelt parameters radiative lifetimes and emission cross-sections were calculated. The cross-sections show a linear decrease with increasing temperature. © 2019 Elsevier B.V.",
journal = "Physica B: Condensed Matter",
title = "Temperature and concentration dependent Judd-Ofelt analysis of Y2O3:Eu3+ and YVO4:Eu3+",
volume = "579",
pages = "411891",
doi = "10.1016/j.physb.2019.411891"
}

Ćirić, A., Stojadinović, S.,& Dramićanin, M.. (2020). Temperature and concentration dependent Judd-Ofelt analysis of Y2O3:Eu3+ and YVO4:Eu3+. in Physica B: Condensed Matter, 579, 411891.
https://doi.org/10.1016/j.physb.2019.411891

Ćirić A, Stojadinović S, Dramićanin M. Temperature and concentration dependent Judd-Ofelt analysis of Y2O3:Eu3+ and YVO4:Eu3+. in Physica B: Condensed Matter. 2020;579:411891.
doi:10.1016/j.physb.2019.411891 .

Ćirić, Aleksandar, Stojadinović, Stevan, Dramićanin, Miroslav, "Temperature and concentration dependent Judd-Ofelt analysis of Y2O3:Eu3+ and YVO4:Eu3+" in Physica B: Condensed Matter, 579 (2020):411891,
https://doi.org/10.1016/j.physb.2019.411891 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Stojadinović, Stevan
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8937
AB  - Zirconia (ZrO2) coatings, doped with Gd3+ and Dy3+ in various concentrations, were created by the plasma electrolytic oxidation (PEO) process of zirconium by the addition of Gd2O3 and Dy2O3 particles to the supporting electrolyte, respectively. Their morphological, chemical, phase, and above all, photoluminescent (PL) properties were examined. Morphologies resemble the typical appearance for PEO created coatings. Incorporated rare-earth species are uniformly distributed over the coatings. Gd3+ ion gets more easily incorporated than Dy3+ by the PEO. The main identified phase of ZrO2 is monoclinic. Gd3+ induces the morphing to the tetragonal phase, proportional to its doping concentration. Gd3+ exhibits maximum emission at 313 nm, corresponding to the 6P7/2 → 8S7/2 transition, by the 278 nm excitation, with intensity proportional to the doping concentration. The spectra also feature a broad-band originating from ZrO2 host matrix. The ZrO2:Dy3+ spectra feature peaks at typical positions for 4f-4f transitions of Dy3+, overlapping with ZrO2 PL. The appearance of new sharp peaks when exciting into the charge transfer band of Dy3+-O2- in comparison to the direct 4f-4f excitation is due to the emissions from the higher levels of Dy3+. PL emission intensity of ZrO2 drops with increasing Gd3+ or Dy3+ concentrations, indicating an efficient energy transfer mechanism. CIE diagram showed that the emissions of ZrO2:Dy3+ correspond to the cool-white (at ca. 4000 K) and warm-white (at ca. 3000 K) light, by the 355 nm and 280 nm excitations, respectively.
T2  - Journal of Alloys and Compounds
T1  - Photoluminescence of ZrO2:Gd3+ and ZrO2:Dy3+ coatings formed by the plasma electrolytic oxidation
VL  - 832
SP  - 154907
DO  - 10.1016/j.jallcom.2020.154907
ER  - 

@article{
author = "Ćirić, Aleksandar and Stojadinović, Stevan",
year = "2020",
abstract = "Zirconia (ZrO2) coatings, doped with Gd3+ and Dy3+ in various concentrations, were created by the plasma electrolytic oxidation (PEO) process of zirconium by the addition of Gd2O3 and Dy2O3 particles to the supporting electrolyte, respectively. Their morphological, chemical, phase, and above all, photoluminescent (PL) properties were examined. Morphologies resemble the typical appearance for PEO created coatings. Incorporated rare-earth species are uniformly distributed over the coatings. Gd3+ ion gets more easily incorporated than Dy3+ by the PEO. The main identified phase of ZrO2 is monoclinic. Gd3+ induces the morphing to the tetragonal phase, proportional to its doping concentration. Gd3+ exhibits maximum emission at 313 nm, corresponding to the 6P7/2 → 8S7/2 transition, by the 278 nm excitation, with intensity proportional to the doping concentration. The spectra also feature a broad-band originating from ZrO2 host matrix. The ZrO2:Dy3+ spectra feature peaks at typical positions for 4f-4f transitions of Dy3+, overlapping with ZrO2 PL. The appearance of new sharp peaks when exciting into the charge transfer band of Dy3+-O2- in comparison to the direct 4f-4f excitation is due to the emissions from the higher levels of Dy3+. PL emission intensity of ZrO2 drops with increasing Gd3+ or Dy3+ concentrations, indicating an efficient energy transfer mechanism. CIE diagram showed that the emissions of ZrO2:Dy3+ correspond to the cool-white (at ca. 4000 K) and warm-white (at ca. 3000 K) light, by the 355 nm and 280 nm excitations, respectively.",
journal = "Journal of Alloys and Compounds",
title = "Photoluminescence of ZrO2:Gd3+ and ZrO2:Dy3+ coatings formed by the plasma electrolytic oxidation",
volume = "832",
pages = "154907",
doi = "10.1016/j.jallcom.2020.154907"
}

Ćirić, A.,& Stojadinović, S.. (2020). Photoluminescence of ZrO2:Gd3+ and ZrO2:Dy3+ coatings formed by the plasma electrolytic oxidation. in Journal of Alloys and Compounds, 832, 154907.
https://doi.org/10.1016/j.jallcom.2020.154907

Ćirić A, Stojadinović S. Photoluminescence of ZrO2:Gd3+ and ZrO2:Dy3+ coatings formed by the plasma electrolytic oxidation. in Journal of Alloys and Compounds. 2020;832:154907.
doi:10.1016/j.jallcom.2020.154907 .

Ćirić, Aleksandar, Stojadinović, Stevan, "Photoluminescence of ZrO2:Gd3+ and ZrO2:Dy3+ coatings formed by the plasma electrolytic oxidation" in Journal of Alloys and Compounds, 832 (2020):154907,
https://doi.org/10.1016/j.jallcom.2020.154907 . .

TY  - JOUR
AU  - Stojadinović, Stevan
AU  - Ćirić, Aleksandar
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9030
AB  - In this paper, Dy3+ and Dy3+/Ce3+ doped Al2O3 coatings were synthesized by plasma electrolytic oxidation process of aluminum. Structural and photoluminescence (PL) properties of obtained coatings as well as energy transfer mechanism from Ce3+ to Dy3+ were studied. The PL excitation and emission spectra of Al2O3:Dy3+ featured weak bands attributed to f-f transitions of Dy3+. The PL emission spectrum of Al2O3:Dy3+ exhibits three emission bands in blue-yellow-red regions, assigned to F-4(9/2)-> H-6(15/2), F-4(9/2)-> H-6(13/2), and F-4(9/2)-> H-6(11/2) transitions of Dy3+, respectively. Under middle UV excitation the Ce3+ in Al2O3 emits broad band, peaked at about 330 nm, attributed to the 5d -> 4f transition of Ce3+. Because of the strong overlap between the PL emission of Ce3+ and the PL excitation of Dy3+ in Al2O3, energy transfer from Ce3+ to the Dy3+ in Al2O3:Dy3+/Ce3+ is observed upon 285 nm excitation. PL emissions due to F-4(9/2)-> H-6(J) (J = 11/2, 13/2, and 15/2) transitions of Dy3+ in Al2O3:Dy3+/Ce3+ is two to three orders of magnitude larger than in Al2O3:Dy3+. The values of CIE chromaticity coordinates for Al2O3:Dy3+/Ce3+ suggest their application for cold white light emission.
T2  - Journal of Luminescence
T1  - Dy3+ and Dy3+/Ce3+ doped Al2O3 coatings obtained by plasma electrolytic oxidation: Photoluminescence and energy transfer from Ce3+ to Dy3+
VL  - 226
SP  - 117403
DO  - 10.1016/j.jlumin.2020.117403
ER  - 

@article{
author = "Stojadinović, Stevan and Ćirić, Aleksandar",
year = "2020",
abstract = "In this paper, Dy3+ and Dy3+/Ce3+ doped Al2O3 coatings were synthesized by plasma electrolytic oxidation process of aluminum. Structural and photoluminescence (PL) properties of obtained coatings as well as energy transfer mechanism from Ce3+ to Dy3+ were studied. The PL excitation and emission spectra of Al2O3:Dy3+ featured weak bands attributed to f-f transitions of Dy3+. The PL emission spectrum of Al2O3:Dy3+ exhibits three emission bands in blue-yellow-red regions, assigned to F-4(9/2)-> H-6(15/2), F-4(9/2)-> H-6(13/2), and F-4(9/2)-> H-6(11/2) transitions of Dy3+, respectively. Under middle UV excitation the Ce3+ in Al2O3 emits broad band, peaked at about 330 nm, attributed to the 5d -> 4f transition of Ce3+. Because of the strong overlap between the PL emission of Ce3+ and the PL excitation of Dy3+ in Al2O3, energy transfer from Ce3+ to the Dy3+ in Al2O3:Dy3+/Ce3+ is observed upon 285 nm excitation. PL emissions due to F-4(9/2)-> H-6(J) (J = 11/2, 13/2, and 15/2) transitions of Dy3+ in Al2O3:Dy3+/Ce3+ is two to three orders of magnitude larger than in Al2O3:Dy3+. The values of CIE chromaticity coordinates for Al2O3:Dy3+/Ce3+ suggest their application for cold white light emission.",
journal = "Journal of Luminescence",
title = "Dy3+ and Dy3+/Ce3+ doped Al2O3 coatings obtained by plasma electrolytic oxidation: Photoluminescence and energy transfer from Ce3+ to Dy3+",
volume = "226",
pages = "117403",
doi = "10.1016/j.jlumin.2020.117403"
}

Stojadinović, S.,& Ćirić, A.. (2020). Dy3+ and Dy3+/Ce3+ doped Al2O3 coatings obtained by plasma electrolytic oxidation: Photoluminescence and energy transfer from Ce3+ to Dy3+. in Journal of Luminescence, 226, 117403.
https://doi.org/10.1016/j.jlumin.2020.117403

Stojadinović S, Ćirić A. Dy3+ and Dy3+/Ce3+ doped Al2O3 coatings obtained by plasma electrolytic oxidation: Photoluminescence and energy transfer from Ce3+ to Dy3+. in Journal of Luminescence. 2020;226:117403.
doi:10.1016/j.jlumin.2020.117403 .

Stojadinović, Stevan, Ćirić, Aleksandar, "Dy3+ and Dy3+/Ce3+ doped Al2O3 coatings obtained by plasma electrolytic oxidation: Photoluminescence and energy transfer from Ce3+ to Dy3+" in Journal of Luminescence, 226 (2020):117403,
https://doi.org/10.1016/j.jlumin.2020.117403 . .

TY  - JOUR
AU  - Stojadinović, Stevan
AU  - Ćirić, Aleksandar
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9031
AB  - In this paper, photoluminescence (PL) properties of Pr3+ single doped and Pr3+/Eu2+ co-doped Al2O3 coatings formed by plasma electrolytic oxidation of aluminum were investigated. The PL spectra of Al2O3:Pr3+ coatings feature bands ascribed to 4f-4f transitions of Pr3+. PL excitation spectra contain three broad bands in the violet and blue regions which correspond to the direct excitation of the Pr3+ ground state H-3(4) into higher levels P-3(J) (J = 0, 1, 2), while PL emission spectra contain several bands attributed to transitions of Pr3+ from excited levels P-3(0) and P-3(1) to the lower multiplets( 3)H(J) (J = 4, 5, 6) and F-3(J) (J = 2, 3, 4). Among these transitions, P-3(0)-> F-3(2) transition in the red region (644 nm) is the most intense. PL emission intensity of Pr3+ increases by co-doping Eu2+ into Al2O3:Pr(3+ )coatings due to the energy transfer from Eu2+ to Pr3+, occurring due to the overlap between PL emission spectra of Eu2+, excited by middle ultraviolet radiation, and PL excitation spectra of Pr3+ in Al2O3 host. Under middle ultraviolet excitation, P-3(0)-> F-3(2) transition of Pr3+ in Al2O3:Pr3+/Eu2+ coatings is 62 times more intense than without co-doping and 16 times if comparison is made with Al2O3:Pr3+ excited by 446 nm. The total luminescence intensity of Al(2)O(3 )co-doped with Pr3+/Eu2+ and doped with Pr3+ is 3.6 times more intense of the former if both samples are excited by 446 nm. The gains are linearly increasing with Eu2+ doping concentration. Al2O3:Pr3+/Eu2+ poses as an alternative phosphor to YAG:Ce3+ for the creation of neutral white LEDs by excitation with InGaN semiconductors.
T2  - Journal of Luminescence
T1  - Highly-increased photoluminescence of Pr3+ due to the Eu2+→ Pr3+ energy transfer in Al2O3 coatings formed by plasma electrolytic oxidation
VL  - 226
SP  - 117407
DO  - 10.1016/j.jlumin.2020.117407
ER  - 

@article{
author = "Stojadinović, Stevan and Ćirić, Aleksandar",
year = "2020",
abstract = "In this paper, photoluminescence (PL) properties of Pr3+ single doped and Pr3+/Eu2+ co-doped Al2O3 coatings formed by plasma electrolytic oxidation of aluminum were investigated. The PL spectra of Al2O3:Pr3+ coatings feature bands ascribed to 4f-4f transitions of Pr3+. PL excitation spectra contain three broad bands in the violet and blue regions which correspond to the direct excitation of the Pr3+ ground state H-3(4) into higher levels P-3(J) (J = 0, 1, 2), while PL emission spectra contain several bands attributed to transitions of Pr3+ from excited levels P-3(0) and P-3(1) to the lower multiplets( 3)H(J) (J = 4, 5, 6) and F-3(J) (J = 2, 3, 4). Among these transitions, P-3(0)-> F-3(2) transition in the red region (644 nm) is the most intense. PL emission intensity of Pr3+ increases by co-doping Eu2+ into Al2O3:Pr(3+ )coatings due to the energy transfer from Eu2+ to Pr3+, occurring due to the overlap between PL emission spectra of Eu2+, excited by middle ultraviolet radiation, and PL excitation spectra of Pr3+ in Al2O3 host. Under middle ultraviolet excitation, P-3(0)-> F-3(2) transition of Pr3+ in Al2O3:Pr3+/Eu2+ coatings is 62 times more intense than without co-doping and 16 times if comparison is made with Al2O3:Pr3+ excited by 446 nm. The total luminescence intensity of Al(2)O(3 )co-doped with Pr3+/Eu2+ and doped with Pr3+ is 3.6 times more intense of the former if both samples are excited by 446 nm. The gains are linearly increasing with Eu2+ doping concentration. Al2O3:Pr3+/Eu2+ poses as an alternative phosphor to YAG:Ce3+ for the creation of neutral white LEDs by excitation with InGaN semiconductors.",
journal = "Journal of Luminescence",
title = "Highly-increased photoluminescence of Pr3+ due to the Eu2+→ Pr3+ energy transfer in Al2O3 coatings formed by plasma electrolytic oxidation",
volume = "226",
pages = "117407",
doi = "10.1016/j.jlumin.2020.117407"
}

Stojadinović, S.,& Ćirić, A.. (2020). Highly-increased photoluminescence of Pr3+ due to the Eu2+→ Pr3+ energy transfer in Al2O3 coatings formed by plasma electrolytic oxidation. in Journal of Luminescence, 226, 117407.
https://doi.org/10.1016/j.jlumin.2020.117407

Stojadinović S, Ćirić A. Highly-increased photoluminescence of Pr3+ due to the Eu2+→ Pr3+ energy transfer in Al2O3 coatings formed by plasma electrolytic oxidation. in Journal of Luminescence. 2020;226:117407.
doi:10.1016/j.jlumin.2020.117407 .

Stojadinović, Stevan, Ćirić, Aleksandar, "Highly-increased photoluminescence of Pr3+ due to the Eu2+→ Pr3+ energy transfer in Al2O3 coatings formed by plasma electrolytic oxidation" in Journal of Luminescence, 226 (2020):117407,
https://doi.org/10.1016/j.jlumin.2020.117407 . .