TY  - JOUR
AU  - Lazić, Vesna
AU  - Sredojević, Dušan
AU  - Ćirić, Aleksandar
AU  - Nedeljković, Jovan
AU  - Zelenková, Gabriela
AU  - Férová, Marta
AU  - Zelenka, Tomáš
AU  - Chavhan, Madhav Prabhakar
AU  - Slovák, Václav
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12392
AB  - The surface modification of commercial TiO2 powder with catecholate-type ligand Tiron (TIR) leads to the formation of the interfacial charge transfer complex (ICT) absorbing in the visible spectral range. The estimated band gap energy of the ICT complex (Eg = 2.2 eV) by density functional theory (DFT) calculations agrees with experimental measurements. The surface-modified TiO2 with TIR has enhanced sorption capacity towards Pb2+ ions compared to the pristine one due to the presence of free sulfonate groups. Our attempt to reduce Pb2+ ions to metallic form failed. The TiO2-based ICT complex with TIR can serve as an efficient sorbent to remove Pb2+ ions from the solution without the ability to recover them in metallic form in a photo-driven catalytic process. The photocatalytic ability of the ICT complex to induce oxidation reactions is significantly improved since the complete degradation of organic dye methyl orange occurs under exclusive excitations with visible light photons.
T2  - Journal of Photochemistry and Photobiology A: Chemistry
T1  - The photocatalytic ability of visible-light-responsive interfacial charge transfer complex between TiO2 and Tiron
VL  - 449
SP  - 115394
DO  - 10.1016/j.jphotochem.2023.115394
ER  - 

@article{
author = "Lazić, Vesna and Sredojević, Dušan and Ćirić, Aleksandar and Nedeljković, Jovan and Zelenková, Gabriela and Férová, Marta and Zelenka, Tomáš and Chavhan, Madhav Prabhakar and Slovák, Václav",
year = "2024",
abstract = "The surface modification of commercial TiO2 powder with catecholate-type ligand Tiron (TIR) leads to the formation of the interfacial charge transfer complex (ICT) absorbing in the visible spectral range. The estimated band gap energy of the ICT complex (Eg = 2.2 eV) by density functional theory (DFT) calculations agrees with experimental measurements. The surface-modified TiO2 with TIR has enhanced sorption capacity towards Pb2+ ions compared to the pristine one due to the presence of free sulfonate groups. Our attempt to reduce Pb2+ ions to metallic form failed. The TiO2-based ICT complex with TIR can serve as an efficient sorbent to remove Pb2+ ions from the solution without the ability to recover them in metallic form in a photo-driven catalytic process. The photocatalytic ability of the ICT complex to induce oxidation reactions is significantly improved since the complete degradation of organic dye methyl orange occurs under exclusive excitations with visible light photons.",
journal = "Journal of Photochemistry and Photobiology A: Chemistry",
title = "The photocatalytic ability of visible-light-responsive interfacial charge transfer complex between TiO2 and Tiron",
volume = "449",
pages = "115394",
doi = "10.1016/j.jphotochem.2023.115394"
}

Lazić, V., Sredojević, D., Ćirić, A., Nedeljković, J., Zelenková, G., Férová, M., Zelenka, T., Chavhan, M. P.,& Slovák, V.. (2024). The photocatalytic ability of visible-light-responsive interfacial charge transfer complex between TiO2 and Tiron. in Journal of Photochemistry and Photobiology A: Chemistry, 449, 115394.
https://doi.org/10.1016/j.jphotochem.2023.115394

Lazić V, Sredojević D, Ćirić A, Nedeljković J, Zelenková G, Férová M, Zelenka T, Chavhan MP, Slovák V. The photocatalytic ability of visible-light-responsive interfacial charge transfer complex between TiO2 and Tiron. in Journal of Photochemistry and Photobiology A: Chemistry. 2024;449:115394.
doi:10.1016/j.jphotochem.2023.115394 .

Lazić, Vesna, Sredojević, Dušan, Ćirić, Aleksandar, Nedeljković, Jovan, Zelenková, Gabriela, Férová, Marta, Zelenka, Tomáš, Chavhan, Madhav Prabhakar, Slovák, Václav, "The photocatalytic ability of visible-light-responsive interfacial charge transfer complex between TiO2 and Tiron" in Journal of Photochemistry and Photobiology A: Chemistry, 449 (2024):115394,
https://doi.org/10.1016/j.jphotochem.2023.115394 . .

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  - Đačanin Far, Ljubica
AU  - Ćirić, Aleksandar
AU  - Sekulić, Milica
AU  - Periša, Jovana
AU  - Ristić, Zoran
AU  - Antić, Željka
AU  - Dramićanin, Miroslav
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10551
AB  - YNbO4:xEu3+ powders (0.1, 0.25, 0.5, 0.75, 1, 3, 5, 7.5, 10, 15, 20 mol %) were synthesized by a solid-state reaction, after homogenization in a vibrational mill. All the samples crystallize in a monoclinic Fergusonite-beta-(Y) structure (C2/c space group), with 45–65 nm crystallite sizes and show a strong orange/red luminescence with 5D0 excited state lifetimes of around 0.6 ms. Photoluminescence emission spectra showed no concentration quenching within the examined concentration range. Judd–Ofelt intensity parameters show a slight increase with rising concentration, up to Ω2 = 8.13∙10−20 cm2, Ω4 = 2.67∙10−20 cm2, and Ω6 is concentration invariant with the 0.35∙10−20 cm2 value. Emission lifetimes of the 5D0 state are almost constant with ∼0.6 ms, and a slight decrease is observed with the highest concentrations. The intrinsic quantum yield of all the samples is about 0.5.
T2  - Optik
T1  - Judd-Ofelt description of radiative properties of YNbO4 activated with different Eu3+ concentrations
VL  - 272
SP  - 170398
DO  - 10.1016/j.ijleo.2022.170398
ER  - 

@article{
author = "Đačanin Far, Ljubica and Ćirić, Aleksandar and Sekulić, Milica and Periša, Jovana and Ristić, Zoran and Antić, Željka and Dramićanin, Miroslav",
year = "2023",
abstract = "YNbO4:xEu3+ powders (0.1, 0.25, 0.5, 0.75, 1, 3, 5, 7.5, 10, 15, 20 mol %) were synthesized by a solid-state reaction, after homogenization in a vibrational mill. All the samples crystallize in a monoclinic Fergusonite-beta-(Y) structure (C2/c space group), with 45–65 nm crystallite sizes and show a strong orange/red luminescence with 5D0 excited state lifetimes of around 0.6 ms. Photoluminescence emission spectra showed no concentration quenching within the examined concentration range. Judd–Ofelt intensity parameters show a slight increase with rising concentration, up to Ω2 = 8.13∙10−20 cm2, Ω4 = 2.67∙10−20 cm2, and Ω6 is concentration invariant with the 0.35∙10−20 cm2 value. Emission lifetimes of the 5D0 state are almost constant with ∼0.6 ms, and a slight decrease is observed with the highest concentrations. The intrinsic quantum yield of all the samples is about 0.5.",
journal = "Optik",
title = "Judd-Ofelt description of radiative properties of YNbO4 activated with different Eu3+ concentrations",
volume = "272",
pages = "170398",
doi = "10.1016/j.ijleo.2022.170398"
}

Đačanin Far, L., Ćirić, A., Sekulić, M., Periša, J., Ristić, Z., Antić, Ž.,& Dramićanin, M.. (2023). Judd-Ofelt description of radiative properties of YNbO4 activated with different Eu3+ concentrations. in Optik, 272, 170398.
https://doi.org/10.1016/j.ijleo.2022.170398

Đačanin Far L, Ćirić A, Sekulić M, Periša J, Ristić Z, Antić Ž, Dramićanin M. Judd-Ofelt description of radiative properties of YNbO4 activated with different Eu3+ concentrations. in Optik. 2023;272:170398.
doi:10.1016/j.ijleo.2022.170398 .

Đačanin Far, Ljubica, Ćirić, Aleksandar, Sekulić, Milica, Periša, Jovana, Ristić, Zoran, Antić, Željka, Dramićanin, Miroslav, "Judd-Ofelt description of radiative properties of YNbO4 activated with different Eu3+ concentrations" in Optik, 272 (2023):170398,
https://doi.org/10.1016/j.ijleo.2022.170398 . .

TY  - JOUR
AU  - Racu, Andrei V.
AU  - Ristić, Zoran
AU  - Ćirić, Aleksandar
AU  - Ðorđević, Vesna
AU  - Buse, Gabriel
AU  - Poienar, Maria
AU  - Gutmann, Michael J.
AU  - Ivashko, Oleh
AU  - Stef, Marius
AU  - Vizman, Daniel
AU  - Dramićanin, Miroslav
AU  - Piasecki, Michal
AU  - Brik, Mikhail G.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10561
AB  - The understanding of complex relationships between luminescent properties, local symmetry of an emitting center, and the host crystal structure provides a better insight into optical properties of materials. In this work, the alkaline earths CaF2 and BaF2 fluoride crystals doped with 0.1 mol% ErF3 were investigated. The crystals structure has been studied using a synchrotron and laboratory X-ray diffraction. The C3v and C4v sites symmetry were determined using erbium probed high resolution emission spectroscopy (HRPL) at low temperature (LT) of 10 K. The considerable difference in room temperature (RT) optical properties for CaF2 compared to BaF2 crystals was observed. Such difference in absorption intensity of 4.7 times of erbium 4G11/2 manifold in UV, and 7.5 times in green emission from 4S3/2 manifold, could be due to the distinction in the host crystals cationic radius (ΔrCa,Ba) and the dopant-host ionic radius (ΔrCa-Er, ΔrBa-Er). Those Δr differences influence the structure and lead to the following symmetry formation: In CaF2, the C4v and C3v isolated centers were identified, with the determined Er3+- F−i bond lengths of 2.734 Å and 4.735 Å respectively; In BaF2, only C3v isolated centers were identified with the determined Er3+- F−i bond lengths of 5.380 Å. The present work is the first study that takes into account correlations of optical properties, the local symmetry and the structure in mentioned fluorides crystals, and it could be a step forward in the lanthanide doped optical materials systematics.
T2  - Optical Materials
T1  - Analysis of site symmetries of Er3+ doped CaF2 and BaF2 crystals by high resolution photoluminescence spectroscopy
VL  - 136
SP  - 113337
DO  - 10.1016/j.optmat.2022.113337
ER  - 

@article{
author = "Racu, Andrei V. and Ristić, Zoran and Ćirić, Aleksandar and Ðorđević, Vesna and Buse, Gabriel and Poienar, Maria and Gutmann, Michael J. and Ivashko, Oleh and Stef, Marius and Vizman, Daniel and Dramićanin, Miroslav and Piasecki, Michal and Brik, Mikhail G.",
year = "2023",
abstract = "The understanding of complex relationships between luminescent properties, local symmetry of an emitting center, and the host crystal structure provides a better insight into optical properties of materials. In this work, the alkaline earths CaF2 and BaF2 fluoride crystals doped with 0.1 mol% ErF3 were investigated. The crystals structure has been studied using a synchrotron and laboratory X-ray diffraction. The C3v and C4v sites symmetry were determined using erbium probed high resolution emission spectroscopy (HRPL) at low temperature (LT) of 10 K. The considerable difference in room temperature (RT) optical properties for CaF2 compared to BaF2 crystals was observed. Such difference in absorption intensity of 4.7 times of erbium 4G11/2 manifold in UV, and 7.5 times in green emission from 4S3/2 manifold, could be due to the distinction in the host crystals cationic radius (ΔrCa,Ba) and the dopant-host ionic radius (ΔrCa-Er, ΔrBa-Er). Those Δr differences influence the structure and lead to the following symmetry formation: In CaF2, the C4v and C3v isolated centers were identified, with the determined Er3+- F−i bond lengths of 2.734 Å and 4.735 Å respectively; In BaF2, only C3v isolated centers were identified with the determined Er3+- F−i bond lengths of 5.380 Å. The present work is the first study that takes into account correlations of optical properties, the local symmetry and the structure in mentioned fluorides crystals, and it could be a step forward in the lanthanide doped optical materials systematics.",
journal = "Optical Materials",
title = "Analysis of site symmetries of Er3+ doped CaF2 and BaF2 crystals by high resolution photoluminescence spectroscopy",
volume = "136",
pages = "113337",
doi = "10.1016/j.optmat.2022.113337"
}

Racu, A. V., Ristić, Z., Ćirić, A., Ðorđević, V., Buse, G., Poienar, M., Gutmann, M. J., Ivashko, O., Stef, M., Vizman, D., Dramićanin, M., Piasecki, M.,& Brik, M. G.. (2023). Analysis of site symmetries of Er3+ doped CaF2 and BaF2 crystals by high resolution photoluminescence spectroscopy. in Optical Materials, 136, 113337.
https://doi.org/10.1016/j.optmat.2022.113337

Racu AV, Ristić Z, Ćirić A, Ðorđević V, Buse G, Poienar M, Gutmann MJ, Ivashko O, Stef M, Vizman D, Dramićanin M, Piasecki M, Brik MG. Analysis of site symmetries of Er3+ doped CaF2 and BaF2 crystals by high resolution photoluminescence spectroscopy. in Optical Materials. 2023;136:113337.
doi:10.1016/j.optmat.2022.113337 .

Racu, Andrei V., Ristić, Zoran, Ćirić, Aleksandar, Ðorđević, Vesna, Buse, Gabriel, Poienar, Maria, Gutmann, Michael J., Ivashko, Oleh, Stef, Marius, Vizman, Daniel, Dramićanin, Miroslav, Piasecki, Michal, Brik, Mikhail G., "Analysis of site symmetries of Er3+ doped CaF2 and BaF2 crystals by high resolution photoluminescence spectroscopy" in Optical Materials, 136 (2023):113337,
https://doi.org/10.1016/j.optmat.2022.113337 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - van Swieten, Thomas
AU  - Periša, Jovana
AU  - Meijerink, Andries
AU  - Dramićanin, Miroslav
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11066
AB  - Luminescence thermometry is the most versatile remote temperature sensing technique and can be employed from living cells to large surfaces and from cryogenic temperatures to the melting points of metals. Ongoing research aims to optimize the sensitivity of the ratio between the emission intensity from two coupled excited states. However, this approach is inherently limited to temperature-dependent processes involving only the excited states. Here, we develop a novel measurement technique, called luminescence intensity ratio squared (LIR2) for the Yb3+/Er3+ pair, that combines the temperature sensitivity of ground- and excited-state populations. We use Y3Al5O12:Er3+,Yb3+ nanoparticles as a promising model system with both visible and infrared emissions. To apply our method, we record two luminescence spectra at different excitation wavelengths and determine the LIR2 using one emission in each of the two spectra. The LIR2 testing with Y3Al5O12 nanoparticles showed a sensitivity increase of 70% in the visible region and an impressive 230% increase in the NIR region compared to the conventional LIR method. This enhances the measurement precision by a factor of 1.5–2.5. The LIR2 based on the visible upconversion emission is particularly useful for measurements of high temperatures, while the LIR2 based on the downshifted ∼1.5 μm emission may revolutionize temperature measurements of biological samples in the range of physiological temperatures.
T2  - Journal of Applied Physics
T1  - Twofold increase in the sensitivity of Er3+/Yb3+ Boltzmann thermometer
VL  - 133
IS  - 19
SP  - 194501
DO  - 10.1063/5.0149757
ER  - 

@article{
author = "Ćirić, Aleksandar and van Swieten, Thomas and Periša, Jovana and Meijerink, Andries and Dramićanin, Miroslav",
year = "2023",
abstract = "Luminescence thermometry is the most versatile remote temperature sensing technique and can be employed from living cells to large surfaces and from cryogenic temperatures to the melting points of metals. Ongoing research aims to optimize the sensitivity of the ratio between the emission intensity from two coupled excited states. However, this approach is inherently limited to temperature-dependent processes involving only the excited states. Here, we develop a novel measurement technique, called luminescence intensity ratio squared (LIR2) for the Yb3+/Er3+ pair, that combines the temperature sensitivity of ground- and excited-state populations. We use Y3Al5O12:Er3+,Yb3+ nanoparticles as a promising model system with both visible and infrared emissions. To apply our method, we record two luminescence spectra at different excitation wavelengths and determine the LIR2 using one emission in each of the two spectra. The LIR2 testing with Y3Al5O12 nanoparticles showed a sensitivity increase of 70% in the visible region and an impressive 230% increase in the NIR region compared to the conventional LIR method. This enhances the measurement precision by a factor of 1.5–2.5. The LIR2 based on the visible upconversion emission is particularly useful for measurements of high temperatures, while the LIR2 based on the downshifted ∼1.5 μm emission may revolutionize temperature measurements of biological samples in the range of physiological temperatures.",
journal = "Journal of Applied Physics",
title = "Twofold increase in the sensitivity of Er3+/Yb3+ Boltzmann thermometer",
volume = "133",
number = "19",
pages = "194501",
doi = "10.1063/5.0149757"
}

Ćirić, A., van Swieten, T., Periša, J., Meijerink, A.,& Dramićanin, M.. (2023). Twofold increase in the sensitivity of Er3+/Yb3+ Boltzmann thermometer. in Journal of Applied Physics, 133(19), 194501.
https://doi.org/10.1063/5.0149757

Ćirić A, van Swieten T, Periša J, Meijerink A, Dramićanin M. Twofold increase in the sensitivity of Er3+/Yb3+ Boltzmann thermometer. in Journal of Applied Physics. 2023;133(19):194501.
doi:10.1063/5.0149757 .

Ćirić, Aleksandar, van Swieten, Thomas, Periša, Jovana, Meijerink, Andries, Dramićanin, Miroslav, "Twofold increase in the sensitivity of Er3+/Yb3+ Boltzmann thermometer" in Journal of Applied Physics, 133, no. 19 (2023):194501,
https://doi.org/10.1063/5.0149757 . .

TY  - JOUR
AU  - Antić, Željka
AU  - Ćirić, Aleksandar
AU  - Sekulić, Milica
AU  - Periša, Jovana
AU  - Milićević, Bojana
AU  - Alodhayb, Abdullah N.
AU  - Alrebdi, Tahani A.
AU  - Dramićanin, Miroslav
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11216
AB  - The sensitivity of luminescent Boltzmann thermometers is restricted by the energy difference between the thermally coupled excitement levels of trivalent lanthanides, and their values further decrease with increases in temperature, rendering their use at high temperatures difficult. Here, we demonstrate how to overcome this sensitivity limitation by employing multiparameter and multilevel cascade temperature readings. For this purpose, we synthesized Dy3+:Y2SiO5, a phosphor whose emission is known to begin quenching at very high temperatures. Its photoluminescence-emission features, later used for thermometry, consisted of two blue emission bands centered around 486 nm and 458 nm, and two bands centered around 430 nm and 398 nm, which were only visible at elevated temperatures. Next, we performed thermometry using the standard luminescence-intensity ratio (LIR) method, which employs the 4F9/2 and 4I15/2 Dy3+ levels’ emissions and the multilevel cascade method, which additionally uses the 4G11/2 level and overlapping intensities of 4I13/2, 4M21/2, 4K17/2, and 4F7/2 levels to create two LIRs with a larger energy difference than the standard LIR. This approach yielded a sensitivity that was 3.14 times greater than the standard method. Finally, we simultaneously exploited all the LIRs in the multiparameter temperature readings and found a relative sensitivity that was 30 times greater than that of the standard approach.
T2  - Crystals
T1  - Thirty-Fold Increase in Relative Sensitivity of Dy3+ Luminescent Boltzmann Thermometers Using Multiparameter and Multilevel Cascade Temperature Readings
VL  - 13
IS  - 6
SP  - 884
DO  - 10.3390/cryst13060884
ER  - 

@article{
author = "Antić, Željka and Ćirić, Aleksandar and Sekulić, Milica and Periša, Jovana and Milićević, Bojana and Alodhayb, Abdullah N. and Alrebdi, Tahani A. and Dramićanin, Miroslav",
year = "2023",
abstract = "The sensitivity of luminescent Boltzmann thermometers is restricted by the energy difference between the thermally coupled excitement levels of trivalent lanthanides, and their values further decrease with increases in temperature, rendering their use at high temperatures difficult. Here, we demonstrate how to overcome this sensitivity limitation by employing multiparameter and multilevel cascade temperature readings. For this purpose, we synthesized Dy3+:Y2SiO5, a phosphor whose emission is known to begin quenching at very high temperatures. Its photoluminescence-emission features, later used for thermometry, consisted of two blue emission bands centered around 486 nm and 458 nm, and two bands centered around 430 nm and 398 nm, which were only visible at elevated temperatures. Next, we performed thermometry using the standard luminescence-intensity ratio (LIR) method, which employs the 4F9/2 and 4I15/2 Dy3+ levels’ emissions and the multilevel cascade method, which additionally uses the 4G11/2 level and overlapping intensities of 4I13/2, 4M21/2, 4K17/2, and 4F7/2 levels to create two LIRs with a larger energy difference than the standard LIR. This approach yielded a sensitivity that was 3.14 times greater than the standard method. Finally, we simultaneously exploited all the LIRs in the multiparameter temperature readings and found a relative sensitivity that was 30 times greater than that of the standard approach.",
journal = "Crystals",
title = "Thirty-Fold Increase in Relative Sensitivity of Dy3+ Luminescent Boltzmann Thermometers Using Multiparameter and Multilevel Cascade Temperature Readings",
volume = "13",
number = "6",
pages = "884",
doi = "10.3390/cryst13060884"
}

Antić, Ž., Ćirić, A., Sekulić, M., Periša, J., Milićević, B., Alodhayb, A. N., Alrebdi, T. A.,& Dramićanin, M.. (2023). Thirty-Fold Increase in Relative Sensitivity of Dy3+ Luminescent Boltzmann Thermometers Using Multiparameter and Multilevel Cascade Temperature Readings. in Crystals, 13(6), 884.
https://doi.org/10.3390/cryst13060884

Antić Ž, Ćirić A, Sekulić M, Periša J, Milićević B, Alodhayb AN, Alrebdi TA, Dramićanin M. Thirty-Fold Increase in Relative Sensitivity of Dy3+ Luminescent Boltzmann Thermometers Using Multiparameter and Multilevel Cascade Temperature Readings. in Crystals. 2023;13(6):884.
doi:10.3390/cryst13060884 .

Antić, Željka, Ćirić, Aleksandar, Sekulić, Milica, Periša, Jovana, Milićević, Bojana, Alodhayb, Abdullah N., Alrebdi, Tahani A., Dramićanin, Miroslav, "Thirty-Fold Increase in Relative Sensitivity of Dy3+ Luminescent Boltzmann Thermometers Using Multiparameter and Multilevel Cascade Temperature Readings" in Crystals, 13, no. 6 (2023):884,
https://doi.org/10.3390/cryst13060884 . .

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
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11480
AB  - Upconversion nanoparticles show an increasing interest that is not bound to stop for many years to come. The upconversion is observed in various materials, from transition metals, semiconductor quantum dots, lanthanide ions, organic nanoparticles, and their combinations. The advancement in the field and increase in luminescence efficiency is closely bound to the understanding of the underlying mechanisms behind the upconversion in each of the material types, being that excited state absorption, energy transfer upconversion, cooperative luminescence, triplet–triplet annihilation, etc. Currently, their research state ranges from purely scientific to highly applicative and industry ready, and they all possess their limitations and characteristic spectral appeal. This chapter is concerned with the introduction to these various upconversion nanoparticle types and a description of the most efficient upconversion mechanisms that drive their luminescence, providing a guide—a brief handbook in the world of modern upconverting nanoparticles and systems. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
PB  - Singapore : Springer Nature Singapore
T2  - Upconversion Nanoparticles (UCNPs) for Functional Applications
T1  - Mechanisms of Luminescence in Upconversion Nanoparticles
VL  - 24
SP  - 1
EP  - 18
DO  - 10.1007/978-981-99-3913-8_1
ER  - 

@inbook{
author = "Ćirić, Aleksandar",
year = "2023",
abstract = "Upconversion nanoparticles show an increasing interest that is not bound to stop for many years to come. The upconversion is observed in various materials, from transition metals, semiconductor quantum dots, lanthanide ions, organic nanoparticles, and their combinations. The advancement in the field and increase in luminescence efficiency is closely bound to the understanding of the underlying mechanisms behind the upconversion in each of the material types, being that excited state absorption, energy transfer upconversion, cooperative luminescence, triplet–triplet annihilation, etc. Currently, their research state ranges from purely scientific to highly applicative and industry ready, and they all possess their limitations and characteristic spectral appeal. This chapter is concerned with the introduction to these various upconversion nanoparticle types and a description of the most efficient upconversion mechanisms that drive their luminescence, providing a guide—a brief handbook in the world of modern upconverting nanoparticles and systems. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.",
publisher = "Singapore : Springer Nature Singapore",
journal = "Upconversion Nanoparticles (UCNPs) for Functional Applications",
booktitle = "Mechanisms of Luminescence in Upconversion Nanoparticles",
volume = "24",
pages = "1-18",
doi = "10.1007/978-981-99-3913-8_1"
}

Ćirić, A.. (2023). Mechanisms of Luminescence in Upconversion Nanoparticles. in Upconversion Nanoparticles (UCNPs) for Functional Applications
Singapore : Springer Nature Singapore., 24, 1-18.
https://doi.org/10.1007/978-981-99-3913-8_1

Ćirić A. Mechanisms of Luminescence in Upconversion Nanoparticles. in Upconversion Nanoparticles (UCNPs) for Functional Applications. 2023;24:1-18.
doi:10.1007/978-981-99-3913-8_1 .

Ćirić, Aleksandar, "Mechanisms of Luminescence in Upconversion Nanoparticles" in Upconversion Nanoparticles (UCNPs) for Functional Applications, 24 (2023):1-18,
https://doi.org/10.1007/978-981-99-3913-8_1 . .

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  - Marciniak, Lukasz
AU  - Dramićanin, Miroslav
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10228
AB  - In response to the sensitivity limitation of ratiometric luminescence thermometers, herein we propose a novel temperature readout, which exploits two pairs of thermalized energy levels in trivalent lanthanide ion-activated phosphors, to provide significantly enhanced sensitivity. This method is called the luminescence intensity ratio squared (LIR2) method. It is a combination of the dual-excitation single emission band ratiometric (SBR) and conventional (Boltzmann) luminescence intensity ratio (LIR) techniques. The relative sensitivity of LIR2 is the sum of the sensitivities of each method, and its thermal dependence is predicted theoretically. We explain the LIR2 method in detail and identify the perspective of lanthanide-activated probes. The performance of the proposed approach was evaluated using YVO4:Eu3+ and YNbO4:Eu3+ powders and compared with those of the SBR and LIR techniques. The LIR2 method displayed significantly better thermometric performance than SBR and LIR over a wide temperature range (300–850 K)
T2  - Journal of Applied Physics
T1  - Luminescence intensity ratio squared - A new luminescence thermometry method for enhanced sensitivity
VL  - 131
IS  - 11
SP  - 114501
DO  - 10.1063/5.0086807
ER  - 

@article{
author = "Ćirić, Aleksandar and Marciniak, Lukasz and Dramićanin, Miroslav",
year = "2022",
abstract = "In response to the sensitivity limitation of ratiometric luminescence thermometers, herein we propose a novel temperature readout, which exploits two pairs of thermalized energy levels in trivalent lanthanide ion-activated phosphors, to provide significantly enhanced sensitivity. This method is called the luminescence intensity ratio squared (LIR2) method. It is a combination of the dual-excitation single emission band ratiometric (SBR) and conventional (Boltzmann) luminescence intensity ratio (LIR) techniques. The relative sensitivity of LIR2 is the sum of the sensitivities of each method, and its thermal dependence is predicted theoretically. We explain the LIR2 method in detail and identify the perspective of lanthanide-activated probes. The performance of the proposed approach was evaluated using YVO4:Eu3+ and YNbO4:Eu3+ powders and compared with those of the SBR and LIR techniques. The LIR2 method displayed significantly better thermometric performance than SBR and LIR over a wide temperature range (300–850 K)",
journal = "Journal of Applied Physics",
title = "Luminescence intensity ratio squared - A new luminescence thermometry method for enhanced sensitivity",
volume = "131",
number = "11",
pages = "114501",
doi = "10.1063/5.0086807"
}

Ćirić, A., Marciniak, L.,& Dramićanin, M.. (2022). Luminescence intensity ratio squared - A new luminescence thermometry method for enhanced sensitivity. in Journal of Applied Physics, 131(11), 114501.
https://doi.org/10.1063/5.0086807

Ćirić A, Marciniak L, Dramićanin M. Luminescence intensity ratio squared - A new luminescence thermometry method for enhanced sensitivity. in Journal of Applied Physics. 2022;131(11):114501.
doi:10.1063/5.0086807 .

Ćirić, Aleksandar, Marciniak, Lukasz, Dramićanin, Miroslav, "Luminescence intensity ratio squared - A new luminescence thermometry method for enhanced sensitivity" in Journal of Applied Physics, 131, no. 11 (2022):114501,
https://doi.org/10.1063/5.0086807 . .

TY  - JOUR
AU  - Sekulić, Milica
AU  - Dramićanin, Tatjana
AU  - Ćirić, Aleksandar
AU  - Đačanin Far, Ljubica
AU  - Dramićanin, Miroslav
AU  - Đorđević, Vesna R.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10238
AB  - Eu3+-doped YxLu1−xNbO4 (x = 0, 0.25, 0.5, 0.75, 1) were prepared by the solid-state reaction method. YNbO4:Eu3+ and LuNbO4:Eu3+ crystallize as beta-Fergusonite (SG no. 15) in 1–10 μm diameter particles. Photoluminescence emission spectra show a slight linear variation of emission energies and intensities with the solid-solution composition in terms of Y/Lu content. The energy difference between Stark sublevels of 5D0→7F1 emission increases, while the asymmetry ratio decreases with the composition. From the dispersion relations of pure YNbO4 and LuNbO4, the refractive index values for each concentration and emission wavelength are estimated. The Ω2 Judd–Ofelt parameter shows a linear increase from 6.75 to 7.48 × 10−20 cm2 from x = 0 to 1, respectively, and Ω4 from 2.69 to 2.95 × 10−20 cm2. The lowest non-radiative deexcitation rate was observed with x = 1, and thus LuNbO4:Eu3+ is more efficient phosphor than YNbO4:Eu3+.
T2  - Crystals
T1  - Photoluminescence of the Eu3+-Activated YxLu1−xNbO4 (x = 0, 0.25, 0.5, 0.75, 1) Solid-Solution Phosphors
VL  - 12
IS  - 3
SP  - 427
DO  - 10.3390/cryst12030427
ER  - 

@article{
author = "Sekulić, Milica and Dramićanin, Tatjana and Ćirić, Aleksandar and Đačanin Far, Ljubica and Dramićanin, Miroslav and Đorđević, Vesna R.",
year = "2022",
abstract = "Eu3+-doped YxLu1−xNbO4 (x = 0, 0.25, 0.5, 0.75, 1) were prepared by the solid-state reaction method. YNbO4:Eu3+ and LuNbO4:Eu3+ crystallize as beta-Fergusonite (SG no. 15) in 1–10 μm diameter particles. Photoluminescence emission spectra show a slight linear variation of emission energies and intensities with the solid-solution composition in terms of Y/Lu content. The energy difference between Stark sublevels of 5D0→7F1 emission increases, while the asymmetry ratio decreases with the composition. From the dispersion relations of pure YNbO4 and LuNbO4, the refractive index values for each concentration and emission wavelength are estimated. The Ω2 Judd–Ofelt parameter shows a linear increase from 6.75 to 7.48 × 10−20 cm2 from x = 0 to 1, respectively, and Ω4 from 2.69 to 2.95 × 10−20 cm2. The lowest non-radiative deexcitation rate was observed with x = 1, and thus LuNbO4:Eu3+ is more efficient phosphor than YNbO4:Eu3+.",
journal = "Crystals",
title = "Photoluminescence of the Eu3+-Activated YxLu1−xNbO4 (x = 0, 0.25, 0.5, 0.75, 1) Solid-Solution Phosphors",
volume = "12",
number = "3",
pages = "427",
doi = "10.3390/cryst12030427"
}

Sekulić, M., Dramićanin, T., Ćirić, A., Đačanin Far, L., Dramićanin, M.,& Đorđević, V. R.. (2022). Photoluminescence of the Eu3+-Activated YxLu1−xNbO4 (x = 0, 0.25, 0.5, 0.75, 1) Solid-Solution Phosphors. in Crystals, 12(3), 427.
https://doi.org/10.3390/cryst12030427

Sekulić M, Dramićanin T, Ćirić A, Đačanin Far L, Dramićanin M, Đorđević VR. Photoluminescence of the Eu3+-Activated YxLu1−xNbO4 (x = 0, 0.25, 0.5, 0.75, 1) Solid-Solution Phosphors. in Crystals. 2022;12(3):427.
doi:10.3390/cryst12030427 .

Sekulić, Milica, Dramićanin, Tatjana, Ćirić, Aleksandar, Đačanin Far, Ljubica, Dramićanin, Miroslav, Đorđević, Vesna R., "Photoluminescence of the Eu3+-Activated YxLu1−xNbO4 (x = 0, 0.25, 0.5, 0.75, 1) Solid-Solution Phosphors" in Crystals, 12, no. 3 (2022):427,
https://doi.org/10.3390/cryst12030427 . .

TY  - JOUR
AU  - Đačanin Far, Ljubica
AU  - Ćirić, Aleksandar
AU  - Ristić, Zoran
AU  - Periša, Jovana
AU  - Dramićanin, Tatjana
AU  - Lukić-Petrović, Svetlana R.
AU  - Dramićanin, Miroslav
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10342
AB  - Y3NbO7:xEu3+ powders (x = 0.25, 0.5, 0.75, 2, 3, 5, 10 at%) were synthesized by a two-step vibrational milling, alternating with annealing. All the samples crystallize as fluorite-type structure (space group Fm3‾m), with crystallite size 50–60 nm and show a strong orange/red luminescence with an excited state lifetime around 1.2 ms. Photoluminescence excitation and emission spectra show rapid intensity decline after 3 at% of Eu3+ content, indicating this concentration as critical for the concentration quenching, and we predicted multipolar interaction as the dominant mechanism behind it. Judd–Ofelt intensity parameters (Ω2 = 0.941∙10−20 cm2, Ω4 = 0.277∙10−20 cm2, Ω6 = 0.277∙10−20 cm2) were obtained from the excitation spectrum of Y3NbO7:3 at%Eu3+. The emission of this luminescent powder is characterized by radiative and nonradiative lifetimes of 2.3 ms and 2.4 ms, respectively, and an intrinsic quantum yield of 51.5%.
T2  - Ceramics International
T1  - Photoluminescence of Y3NbO7:Eu3+ powders
DO  - 10.1016/j.ceramint.2022.06.130
ER  - 

@article{
author = "Đačanin Far, Ljubica and Ćirić, Aleksandar and Ristić, Zoran and Periša, Jovana and Dramićanin, Tatjana and Lukić-Petrović, Svetlana R. and Dramićanin, Miroslav",
year = "2022",
abstract = "Y3NbO7:xEu3+ powders (x = 0.25, 0.5, 0.75, 2, 3, 5, 10 at%) were synthesized by a two-step vibrational milling, alternating with annealing. All the samples crystallize as fluorite-type structure (space group Fm3‾m), with crystallite size 50–60 nm and show a strong orange/red luminescence with an excited state lifetime around 1.2 ms. Photoluminescence excitation and emission spectra show rapid intensity decline after 3 at% of Eu3+ content, indicating this concentration as critical for the concentration quenching, and we predicted multipolar interaction as the dominant mechanism behind it. Judd–Ofelt intensity parameters (Ω2 = 0.941∙10−20 cm2, Ω4 = 0.277∙10−20 cm2, Ω6 = 0.277∙10−20 cm2) were obtained from the excitation spectrum of Y3NbO7:3 at%Eu3+. The emission of this luminescent powder is characterized by radiative and nonradiative lifetimes of 2.3 ms and 2.4 ms, respectively, and an intrinsic quantum yield of 51.5%.",
journal = "Ceramics International",
title = "Photoluminescence of Y3NbO7:Eu3+ powders",
doi = "10.1016/j.ceramint.2022.06.130"
}

Đačanin Far, L., Ćirić, A., Ristić, Z., Periša, J., Dramićanin, T., Lukić-Petrović, S. R.,& Dramićanin, M.. (2022). Photoluminescence of Y3NbO7:Eu3+ powders. in Ceramics International.
https://doi.org/10.1016/j.ceramint.2022.06.130

Đačanin Far L, Ćirić A, Ristić Z, Periša J, Dramićanin T, Lukić-Petrović SR, Dramićanin M. Photoluminescence of Y3NbO7:Eu3+ powders. in Ceramics International. 2022;.
doi:10.1016/j.ceramint.2022.06.130 .

Đačanin Far, Ljubica, Ćirić, Aleksandar, Ristić, Zoran, Periša, Jovana, Dramićanin, Tatjana, Lukić-Petrović, Svetlana R., Dramićanin, Miroslav, "Photoluminescence of Y3NbO7:Eu3+ powders" in Ceramics International (2022),
https://doi.org/10.1016/j.ceramint.2022.06.130 . .

TY  - JOUR
AU  - Mullins, Abbi L.
AU  - Ćirić, Aleksandar
AU  - Zeković, Ivana Lj.
AU  - Williams, J. A. Gareth
AU  - Dramićanin, Miroslav
AU  - Radosavjević Evans, Ivana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10362
AB  - A series of La1−xGa0.99O3:Cr0.01, Ndx phosphors (where x = 0.005, 0.01, 0.02) for luminescence thermometry was synthesised by the solid-state method, structurally characterised using powder X-ray diffraction data, and investigated by ambient and variable-temperature optical measurements. The design principle relies on the use of a combination of transition metal and rare earth activator ions such that the excitation and emission wavelengths fall within the near infra-red spectral region, notably in the ‘first biological window’ that is attractive for potential in vivo applications. The photoluminescence spectra of the compounds feature the characteristic 2E phosphorescence of Cr3+ at 729 nm and the 4F3/2 → 4I9/2 emission of Nd3+ around 890 nm. The Nd3+ emission is quenched at a higher rate than that of Cr3+ with increasing temperature. Thermometric analysis by monitoring the luminescence intensity ratio (LIR) between the emissions of Cr3+ and Nd3+ from 300 K to 650 K shows a quasi-Boltzmann trend, with a maximum relative sensitivity of ∼2% K−1, high absolute sensitivity values over this entire temperature range, excellent temperature resolution of 0.04 K at room temperature, and high stability.
T2  - Journal of Materials Chemistry C
T1  - Dual-emission luminescence thermometry using LaGaO3:Cr3+, Nd3+ phosphors
VL  - 10
IS  - 28
SP  - 10396
EP  - 10403
DO  - 10.1039/D2TC02011D
ER  - 

@article{
author = "Mullins, Abbi L. and Ćirić, Aleksandar and Zeković, Ivana Lj. and Williams, J. A. Gareth and Dramićanin, Miroslav and Radosavjević Evans, Ivana",
year = "2022",
abstract = "A series of La1−xGa0.99O3:Cr0.01, Ndx phosphors (where x = 0.005, 0.01, 0.02) for luminescence thermometry was synthesised by the solid-state method, structurally characterised using powder X-ray diffraction data, and investigated by ambient and variable-temperature optical measurements. The design principle relies on the use of a combination of transition metal and rare earth activator ions such that the excitation and emission wavelengths fall within the near infra-red spectral region, notably in the ‘first biological window’ that is attractive for potential in vivo applications. The photoluminescence spectra of the compounds feature the characteristic 2E phosphorescence of Cr3+ at 729 nm and the 4F3/2 → 4I9/2 emission of Nd3+ around 890 nm. The Nd3+ emission is quenched at a higher rate than that of Cr3+ with increasing temperature. Thermometric analysis by monitoring the luminescence intensity ratio (LIR) between the emissions of Cr3+ and Nd3+ from 300 K to 650 K shows a quasi-Boltzmann trend, with a maximum relative sensitivity of ∼2% K−1, high absolute sensitivity values over this entire temperature range, excellent temperature resolution of 0.04 K at room temperature, and high stability.",
journal = "Journal of Materials Chemistry C",
title = "Dual-emission luminescence thermometry using LaGaO3:Cr3+, Nd3+ phosphors",
volume = "10",
number = "28",
pages = "10396-10403",
doi = "10.1039/D2TC02011D"
}

Mullins, A. L., Ćirić, A., Zeković, I. Lj., Williams, J. A. G., Dramićanin, M.,& Radosavjević Evans, I.. (2022). Dual-emission luminescence thermometry using LaGaO3:Cr3+, Nd3+ phosphors. in Journal of Materials Chemistry C, 10(28), 10396-10403.
https://doi.org/10.1039/D2TC02011D

Mullins AL, Ćirić A, Zeković IL, Williams JAG, Dramićanin M, Radosavjević Evans I. Dual-emission luminescence thermometry using LaGaO3:Cr3+, Nd3+ phosphors. in Journal of Materials Chemistry C. 2022;10(28):10396-10403.
doi:10.1039/D2TC02011D .

Mullins, Abbi L., Ćirić, Aleksandar, Zeković, Ivana Lj., Williams, J. A. Gareth, Dramićanin, Miroslav, Radosavjević Evans, Ivana, "Dual-emission luminescence thermometry using LaGaO3:Cr3+, Nd3+ phosphors" in Journal of Materials Chemistry C, 10, no. 28 (2022):10396-10403,
https://doi.org/10.1039/D2TC02011D . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Dramićanin, Miroslav
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10470
AB  - Luminescence with temperature changes in its intensity, energy, spectral shape, peak width in the steady-state, or lifetime and phase shift in the impulse regime. Those most often undesired effects (but endorsed for the luminescence thermometry) have been modeled depending on the material type and physical phenomena involved, resulting in numerous equations and explanations. However, there is not a single publication that collected all of the theories and guided the reader to their proper application. Here we devised a review of all prominent theoretical models, for all types of materials and all temperature-induced phenomena on luminescence, extended the original research, and provided the advanced, yet user-friendly, multiplatform, software for fitting the experimental data. The software can be obtained from https://www.omasgroup.org/lumthools/for free. As it is interactive, it is also capable of demonstrating the effect of each fitting parameter on the change of the fitting curve, it calculates and graphs the figures of merit in luminescence thermometry, and exports the data in a format ready for publication.
T2  - Journal of Luminescence
T1  - LumTHools - Software for fitting the temperature dependence of luminescence emission intensity, lifetime, bandshift, and bandwidth and luminescence thermometry and review of the theoretical models
VL  - 252
SP  - 119413
DO  - 10.1016/j.jlumin.2022.119413
ER  - 

@article{
author = "Ćirić, Aleksandar and Dramićanin, Miroslav",
year = "2022",
abstract = "Luminescence with temperature changes in its intensity, energy, spectral shape, peak width in the steady-state, or lifetime and phase shift in the impulse regime. Those most often undesired effects (but endorsed for the luminescence thermometry) have been modeled depending on the material type and physical phenomena involved, resulting in numerous equations and explanations. However, there is not a single publication that collected all of the theories and guided the reader to their proper application. Here we devised a review of all prominent theoretical models, for all types of materials and all temperature-induced phenomena on luminescence, extended the original research, and provided the advanced, yet user-friendly, multiplatform, software for fitting the experimental data. The software can be obtained from https://www.omasgroup.org/lumthools/for free. As it is interactive, it is also capable of demonstrating the effect of each fitting parameter on the change of the fitting curve, it calculates and graphs the figures of merit in luminescence thermometry, and exports the data in a format ready for publication.",
journal = "Journal of Luminescence",
title = "LumTHools - Software for fitting the temperature dependence of luminescence emission intensity, lifetime, bandshift, and bandwidth and luminescence thermometry and review of the theoretical models",
volume = "252",
pages = "119413",
doi = "10.1016/j.jlumin.2022.119413"
}

Ćirić, A.,& Dramićanin, M.. (2022). LumTHools - Software for fitting the temperature dependence of luminescence emission intensity, lifetime, bandshift, and bandwidth and luminescence thermometry and review of the theoretical models. in Journal of Luminescence, 252, 119413.
https://doi.org/10.1016/j.jlumin.2022.119413

Ćirić A, Dramićanin M. LumTHools - Software for fitting the temperature dependence of luminescence emission intensity, lifetime, bandshift, and bandwidth and luminescence thermometry and review of the theoretical models. in Journal of Luminescence. 2022;252:119413.
doi:10.1016/j.jlumin.2022.119413 .

Ćirić, Aleksandar, Dramićanin, Miroslav, "LumTHools - Software for fitting the temperature dependence of luminescence emission intensity, lifetime, bandshift, and bandwidth and luminescence thermometry and review of the theoretical models" in Journal of Luminescence, 252 (2022):119413,
https://doi.org/10.1016/j.jlumin.2022.119413 . .

TY  - JOUR
AU  - Periša, Jovana
AU  - Ćirić, Aleksandar
AU  - Zeković, Ivana
AU  - Đorđević, Vesna
AU  - Sekulić, Milica
AU  - Antić, Željka
AU  - Dramićanin, Miroslav
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10481
AB  - The sensitivity of luminescence thermometry is enhanced at high temperatures when using a three-level luminescence intensity ratio approach with Dy3+- activated yttrium aluminum perovskite. This material was synthesized via the Pechini method, and the structure was verified using X-ray diffraction analysis. The average crystallite size was calculated to be around 46 nm. The morphology was examined using scanning electron microscopy, which showed agglomerates composed of densely packed, elongated spherical particles, the majority of which were 80–100 nm in size. The temperature-dependent photoluminescence emission spectra (ex = 353 nm, 300–850 K) included Dy3+ emissions in blue (458 nm), blue (483 nm), and violet (430 nm, T 600 K). Luminescence intensity ratio, the most utilized temperature readout method in luminescent thermometry, was used as the testing method: a) using the intensity ratio of Dy3+ ions and 4I15/2→6H15/2/4F9/2→6H15/2 transitions; and b) employing the third, higher energy 4G11/2 thermalized level, i.e., using the intensity ratio of 4G11/2→6H15/2/4F9/2→6H15/2 transitions, thereby showing the relative sensitivities of 0.41% K−1 and 0.86% K−1 at 600 K, respectively. This more than doubles the increase in sensitivity and therefore demonstrates the method’s usability at high temperatures, although the major limitation of the method is the chemical stability of the host material and the temperature at which the temperature quenching commences. Lastly, it must be noted that at 850 K, the emission intensities from the energetically higher levels were still increasing in YAP: Dy3+.
T2  - Sensors
T1  - Exploiting High-Energy Emissions of YAlO3:Dy3+ for Sensitivity Improvement of Ratiometric Luminescence Thermometry
VL  - 22
IS  - 20
SP  - 7997
DO  - 10.3390/s22207997
ER  - 

@article{
author = "Periša, Jovana and Ćirić, Aleksandar and Zeković, Ivana and Đorđević, Vesna and Sekulić, Milica and Antić, Željka and Dramićanin, Miroslav",
year = "2022",
abstract = "The sensitivity of luminescence thermometry is enhanced at high temperatures when using a three-level luminescence intensity ratio approach with Dy3+- activated yttrium aluminum perovskite. This material was synthesized via the Pechini method, and the structure was verified using X-ray diffraction analysis. The average crystallite size was calculated to be around 46 nm. The morphology was examined using scanning electron microscopy, which showed agglomerates composed of densely packed, elongated spherical particles, the majority of which were 80–100 nm in size. The temperature-dependent photoluminescence emission spectra (ex = 353 nm, 300–850 K) included Dy3+ emissions in blue (458 nm), blue (483 nm), and violet (430 nm, T 600 K). Luminescence intensity ratio, the most utilized temperature readout method in luminescent thermometry, was used as the testing method: a) using the intensity ratio of Dy3+ ions and 4I15/2→6H15/2/4F9/2→6H15/2 transitions; and b) employing the third, higher energy 4G11/2 thermalized level, i.e., using the intensity ratio of 4G11/2→6H15/2/4F9/2→6H15/2 transitions, thereby showing the relative sensitivities of 0.41% K−1 and 0.86% K−1 at 600 K, respectively. This more than doubles the increase in sensitivity and therefore demonstrates the method’s usability at high temperatures, although the major limitation of the method is the chemical stability of the host material and the temperature at which the temperature quenching commences. Lastly, it must be noted that at 850 K, the emission intensities from the energetically higher levels were still increasing in YAP: Dy3+.",
journal = "Sensors",
title = "Exploiting High-Energy Emissions of YAlO3:Dy3+ for Sensitivity Improvement of Ratiometric Luminescence Thermometry",
volume = "22",
number = "20",
pages = "7997",
doi = "10.3390/s22207997"
}

Periša, J., Ćirić, A., Zeković, I., Đorđević, V., Sekulić, M., Antić, Ž.,& Dramićanin, M.. (2022). Exploiting High-Energy Emissions of YAlO3:Dy3+ for Sensitivity Improvement of Ratiometric Luminescence Thermometry. in Sensors, 22(20), 7997.
https://doi.org/10.3390/s22207997

Periša J, Ćirić A, Zeković I, Đorđević V, Sekulić M, Antić Ž, Dramićanin M. Exploiting High-Energy Emissions of YAlO3:Dy3+ for Sensitivity Improvement of Ratiometric Luminescence Thermometry. in Sensors. 2022;22(20):7997.
doi:10.3390/s22207997 .

Periša, Jovana, Ćirić, Aleksandar, Zeković, Ivana, Đorđević, Vesna, Sekulić, Milica, Antić, Željka, Dramićanin, Miroslav, "Exploiting High-Energy Emissions of YAlO3:Dy3+ for Sensitivity Improvement of Ratiometric Luminescence Thermometry" in Sensors, 22, no. 20 (2022):7997,
https://doi.org/10.3390/s22207997 . .

TY  - CONF
AU  - Sekulić, Milica
AU  - Đačanin Far, Ljubica
AU  - Dramićanin, Tatjana
AU  - Ćirić, Aleksandar
AU  - Dramićanin, Miroslav
AU  - Đorđević, Vesna
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11341
AB  - Lanthanide (Ln) activated phosphors are a major topic in both basic and applied science. The trivalent europium ion (Eu3+) is well recognized for its intense luminescence in the orange/red spectral region, making it useful for a wide range of applications. Because Eu3+ has an even number of electrons in its 4f shell ([Xe]4f 6 ), the ion has non-degenerated ground (7F0) and excited (5D0) energy states, as well as non-overlapping 2S+1LJ multiplets, resulting in emission spectra that are predictable in relation to the host material site symmetry. The solid-state reaction synthesis method was used to make a set of five Eu-doped YxLu1- xNbO4 samples (x=0–1) with a fixed Eu concentration (5%). All the structures crystallize as beta-Fergusonite, in which the Eu ion replaces the Y or Lu ion in a large, low-symmetry octahedron. The excitation and emission spectra of the Eu3+ ion in all composition hosts show characteristic f-f transitions from which Stark energy levels were calculated. Specific features and energy positions of the distinctive 5D0→7F1 magnetic dipole transition were determined when measured with higher resolution and spectra deconvolution was utilized. The maximum ΔE splitting of the 7F1 manifold's Stark splitting and the asymmetry ratio R all show Y/Lu content-dependent trends. Calculations based on Judd-Ofelt theory were utilized to determine specific quantities. The lowest non-radiative deexcitation rate was observed with x = 1, resulting in the conclusion that LuNbO4 is a better host-matrix for Eu3+ emission than other compositions.
PB  - Society for science development of Serbia, Belgrade
C3  - The 6th International Conference on the Physics of Optical Materials and Devices & The 5th International Workshop of Persistent and Photostimulable Phosphors
T1  - Photoluminescent Properties of the Eu3+ ion in YNbO4-LuNbO4 Solid Solution
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11341
ER  - 

@conference{
author = "Sekulić, Milica and Đačanin Far, Ljubica and Dramićanin, Tatjana and Ćirić, Aleksandar and Dramićanin, Miroslav and Đorđević, Vesna",
year = "2022",
abstract = "Lanthanide (Ln) activated phosphors are a major topic in both basic and applied science. The trivalent europium ion (Eu3+) is well recognized for its intense luminescence in the orange/red spectral region, making it useful for a wide range of applications. Because Eu3+ has an even number of electrons in its 4f shell ([Xe]4f 6 ), the ion has non-degenerated ground (7F0) and excited (5D0) energy states, as well as non-overlapping 2S+1LJ multiplets, resulting in emission spectra that are predictable in relation to the host material site symmetry. The solid-state reaction synthesis method was used to make a set of five Eu-doped YxLu1- xNbO4 samples (x=0–1) with a fixed Eu concentration (5%). All the structures crystallize as beta-Fergusonite, in which the Eu ion replaces the Y or Lu ion in a large, low-symmetry octahedron. The excitation and emission spectra of the Eu3+ ion in all composition hosts show characteristic f-f transitions from which Stark energy levels were calculated. Specific features and energy positions of the distinctive 5D0→7F1 magnetic dipole transition were determined when measured with higher resolution and spectra deconvolution was utilized. The maximum ΔE splitting of the 7F1 manifold's Stark splitting and the asymmetry ratio R all show Y/Lu content-dependent trends. Calculations based on Judd-Ofelt theory were utilized to determine specific quantities. The lowest non-radiative deexcitation rate was observed with x = 1, resulting in the conclusion that LuNbO4 is a better host-matrix for Eu3+ emission than other compositions.",
publisher = "Society for science development of Serbia, Belgrade",
journal = "The 6th International Conference on the Physics of Optical Materials and Devices & The 5th International Workshop of Persistent and Photostimulable Phosphors",
title = "Photoluminescent Properties of the Eu3+ ion in YNbO4-LuNbO4 Solid Solution",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11341"
}

Sekulić, M., Đačanin Far, L., Dramićanin, T., Ćirić, A., Dramićanin, M.,& Đorđević, V.. (2022). Photoluminescent Properties of the Eu3+ ion in YNbO4-LuNbO4 Solid Solution. in The 6th International Conference on the Physics of Optical Materials and Devices & The 5th International Workshop of Persistent and Photostimulable Phosphors
Society for science development of Serbia, Belgrade..
https://hdl.handle.net/21.15107/rcub_vinar_11341

Sekulić M, Đačanin Far L, Dramićanin T, Ćirić A, Dramićanin M, Đorđević V. Photoluminescent Properties of the Eu3+ ion in YNbO4-LuNbO4 Solid Solution. in The 6th International Conference on the Physics of Optical Materials and Devices & The 5th International Workshop of Persistent and Photostimulable Phosphors. 2022;.
https://hdl.handle.net/21.15107/rcub_vinar_11341 .

Sekulić, Milica, Đačanin Far, Ljubica, Dramićanin, Tatjana, Ćirić, Aleksandar, Dramićanin, Miroslav, Đorđević, Vesna, "Photoluminescent Properties of the Eu3+ ion in YNbO4-LuNbO4 Solid Solution" in The 6th International Conference on the Physics of Optical Materials and Devices & The 5th International Workshop of Persistent and Photostimulable Phosphors (2022),
https://hdl.handle.net/21.15107/rcub_vinar_11341 .

TY  - JOUR
AU  - Mullins, Abbi L.
AU  - Ćirić, Aleksandar
AU  - Ristić, Zoran
AU  - Williams, J. A. Gareth
AU  - Radosavjević Evans, Ivana
AU  - Dramićanin, Miroslav
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10219
AB  - A series of LaGa1–xO3:Cr3+x phosphors (x = 0.002, 0.005, 0.01, 0.02, 0.04) were synthesised by solid-state reaction and structurally characterised by Rietveld refinement from powder X-ray diffraction data. Amongst the five compounds, that with x = 0.01 exhibited the highest photoluminescence quantum yield at room temperature, those with higher doping levels probably suffering from self-quenching of the luminescence. This compound was selected for study of the temperature-dependence of the optical properties. The emission spectra recorded over the range 300–600 K reveal distinct features: a broad band that initially increases with temperature, attributed to fluorescence from the 4T2 excited state, and a series of sharp peaks that monotonically decline with temperature, attributed to phosphorescence from the 2E. The thermometry capabilities of LaGa0.99O3:Cr0.01 were probed by the luminescence intensity ratio (LIR) method using the broad 4T2 band relative to the sharp 2E peaks. To overcome the difficulties associated with the significant overlap of the broad and sharp emissions of Cr3+, a novel method was applied in which the deconvolution of broad peaks was performed in two steps, by fitting the broad bands to the curve sections without the sharp peaks. The ratio of the deconvoluted 4T2 and 2E intensities gave an excellent fit to the Boltzmann distribution, with an energy gap between them of 2172 cm–1. The high relative sensitivity at room temperature of ca. 2.5% K–1 demonstrates very good potential of LaGa0.99O3:Cr0.01 for thermometry in the first biological window of transparency, relevant for in vivo biomedical applications.
T2  - Journal of Luminescence
T1  - Double-deconvolution method for the separation of thermalised emissions from chromium-doped lanthanum gallate and its potential in luminescence-based thermometry
VL  - 246
SP  - 118847
DO  - 10.1016/j.jlumin.2022.118847
ER  - 

@article{
author = "Mullins, Abbi L. and Ćirić, Aleksandar and Ristić, Zoran and Williams, J. A. Gareth and Radosavjević Evans, Ivana and Dramićanin, Miroslav",
year = "2022",
abstract = "A series of LaGa1–xO3:Cr3+x phosphors (x = 0.002, 0.005, 0.01, 0.02, 0.04) were synthesised by solid-state reaction and structurally characterised by Rietveld refinement from powder X-ray diffraction data. Amongst the five compounds, that with x = 0.01 exhibited the highest photoluminescence quantum yield at room temperature, those with higher doping levels probably suffering from self-quenching of the luminescence. This compound was selected for study of the temperature-dependence of the optical properties. The emission spectra recorded over the range 300–600 K reveal distinct features: a broad band that initially increases with temperature, attributed to fluorescence from the 4T2 excited state, and a series of sharp peaks that monotonically decline with temperature, attributed to phosphorescence from the 2E. The thermometry capabilities of LaGa0.99O3:Cr0.01 were probed by the luminescence intensity ratio (LIR) method using the broad 4T2 band relative to the sharp 2E peaks. To overcome the difficulties associated with the significant overlap of the broad and sharp emissions of Cr3+, a novel method was applied in which the deconvolution of broad peaks was performed in two steps, by fitting the broad bands to the curve sections without the sharp peaks. The ratio of the deconvoluted 4T2 and 2E intensities gave an excellent fit to the Boltzmann distribution, with an energy gap between them of 2172 cm–1. The high relative sensitivity at room temperature of ca. 2.5% K–1 demonstrates very good potential of LaGa0.99O3:Cr0.01 for thermometry in the first biological window of transparency, relevant for in vivo biomedical applications.",
journal = "Journal of Luminescence",
title = "Double-deconvolution method for the separation of thermalised emissions from chromium-doped lanthanum gallate and its potential in luminescence-based thermometry",
volume = "246",
pages = "118847",
doi = "10.1016/j.jlumin.2022.118847"
}

Mullins, A. L., Ćirić, A., Ristić, Z., Williams, J. A. G., Radosavjević Evans, I.,& Dramićanin, M.. (2022). Double-deconvolution method for the separation of thermalised emissions from chromium-doped lanthanum gallate and its potential in luminescence-based thermometry. in Journal of Luminescence, 246, 118847.
https://doi.org/10.1016/j.jlumin.2022.118847

Mullins AL, Ćirić A, Ristić Z, Williams JAG, Radosavjević Evans I, Dramićanin M. Double-deconvolution method for the separation of thermalised emissions from chromium-doped lanthanum gallate and its potential in luminescence-based thermometry. in Journal of Luminescence. 2022;246:118847.
doi:10.1016/j.jlumin.2022.118847 .

Mullins, Abbi L., Ćirić, Aleksandar, Ristić, Zoran, Williams, J. A. Gareth, Radosavjević Evans, Ivana, Dramićanin, Miroslav, "Double-deconvolution method for the separation of thermalised emissions from chromium-doped lanthanum gallate and its potential in luminescence-based thermometry" in Journal of Luminescence, 246 (2022):118847,
https://doi.org/10.1016/j.jlumin.2022.118847 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Periša, Jovana
AU  - Zeković, Ivana Lj.
AU  - Antić, Željka
AU  - Dramićanin, Miroslav
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10172
AB  - We report on overcoming the sensitivity limit of Boltzmann's thermometers by utilization of seven thermalized Dy3+ excited states in the Lu1.5Y1·5Al5O12 host. Emission spectra recorded from room temperature to 938 K show transitions originating from seven 4F9/2, 4I15/2, 4G11/2, 4I13/2, 4M21/2, 4K17/2, and 4F7/2 excited levels to the 6H15/2 ground state. We introduce the multi-cascade LIR (McLIR) by extending the conventional, two-thermalized level Boltzmann-type LIR to seven thermalized levels. This approach provides higher energy differences between thermalized levels which results in five times larger sensitivity than in the conventional LIR. Considering energy differences between Dy3+ excited states of 1043, 2464, 4331, and 5089 cm−1, the luminescence thermometry with McLIR provided 0.35, 0.84, 1.47, 1.73% K−1 relative sensitivities at 650 K, respectively, in four different LIR combinations. The validity of the McLIR method and the effectiveness of thermalizations between levels is confirmed with the good theoretical fit of experimental data.
T2  - Journal of Luminescence
T1  - Multilevel-cascade intensity ratio temperature read-out of Dy3+ luminescence thermometers
VL  - 245
SP  - 118795
DO  - 10.1016/j.jlumin.2022.118795
ER  - 

@article{
author = "Ćirić, Aleksandar and Periša, Jovana and Zeković, Ivana Lj. and Antić, Željka and Dramićanin, Miroslav",
year = "2022",
abstract = "We report on overcoming the sensitivity limit of Boltzmann's thermometers by utilization of seven thermalized Dy3+ excited states in the Lu1.5Y1·5Al5O12 host. Emission spectra recorded from room temperature to 938 K show transitions originating from seven 4F9/2, 4I15/2, 4G11/2, 4I13/2, 4M21/2, 4K17/2, and 4F7/2 excited levels to the 6H15/2 ground state. We introduce the multi-cascade LIR (McLIR) by extending the conventional, two-thermalized level Boltzmann-type LIR to seven thermalized levels. This approach provides higher energy differences between thermalized levels which results in five times larger sensitivity than in the conventional LIR. Considering energy differences between Dy3+ excited states of 1043, 2464, 4331, and 5089 cm−1, the luminescence thermometry with McLIR provided 0.35, 0.84, 1.47, 1.73% K−1 relative sensitivities at 650 K, respectively, in four different LIR combinations. The validity of the McLIR method and the effectiveness of thermalizations between levels is confirmed with the good theoretical fit of experimental data.",
journal = "Journal of Luminescence",
title = "Multilevel-cascade intensity ratio temperature read-out of Dy3+ luminescence thermometers",
volume = "245",
pages = "118795",
doi = "10.1016/j.jlumin.2022.118795"
}

Ćirić, A., Periša, J., Zeković, I. Lj., Antić, Ž.,& Dramićanin, M.. (2022). Multilevel-cascade intensity ratio temperature read-out of Dy3+ luminescence thermometers. in Journal of Luminescence, 245, 118795.
https://doi.org/10.1016/j.jlumin.2022.118795

Ćirić A, Periša J, Zeković IL, Antić Ž, Dramićanin M. Multilevel-cascade intensity ratio temperature read-out of Dy3+ luminescence thermometers. in Journal of Luminescence. 2022;245:118795.
doi:10.1016/j.jlumin.2022.118795 .

Ćirić, Aleksandar, Periša, Jovana, Zeković, Ivana Lj., Antić, Željka, Dramićanin, Miroslav, "Multilevel-cascade intensity ratio temperature read-out of Dy3+ luminescence thermometers" in Journal of Luminescence, 245 (2022):118795,
https://doi.org/10.1016/j.jlumin.2022.118795 . .

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  - JOUR
AU  - Ćirić, Aleksandar
AU  - Marciniak, Lukasz
AU  - Dramićanin, Miroslav
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10133
AB  - Judd–Ofelt theory is a cornerstone of lanthanides’ spectroscopy given that it describes 4fn emissions and absorptions of lanthanide ions using only three intensity parameters. A self-referenced technique for computing Judd–Ofelt intensity parameters from the excitation spectra of Eu3+-activated luminescent materials is presented in this study along with an explanation of the parametrisation procedure and free user-friendly web application. It uses the integrated intensities of the 7F0 → 5D2, 7F0 → 5D4, and 7F0 → 5L6 transitions in the excitation spectrum for estimation and the integrated intensity of the 7F0 → 5D1 magnetic dipole transition for calibration. This approach facilitates an effortless derivation of the Ω6 intensity parameter, which is challenging to compute precisely by Krupke’s parametrisation of the emission spectrum and, therefore, often omitted in published research papers. Compared to the parametrisation of absorption spectra, the described method is more accurate, can be applied to any material form, and requires a single excitation spectrum.
T2  - Scientific Reports
T1  - Self‑referenced method
for the Judd–Ofelt parametrisation
of the ­Eu3+ excitation spectrum
VL  - 12
IS  - 1
SP  - 563
DO  - 10.1038/s41598-021-04651-4
ER  - 

@article{
author = "Ćirić, Aleksandar and Marciniak, Lukasz and Dramićanin, Miroslav",
year = "2022",
abstract = "Judd–Ofelt theory is a cornerstone of lanthanides’ spectroscopy given that it describes 4fn emissions and absorptions of lanthanide ions using only three intensity parameters. A self-referenced technique for computing Judd–Ofelt intensity parameters from the excitation spectra of Eu3+-activated luminescent materials is presented in this study along with an explanation of the parametrisation procedure and free user-friendly web application. It uses the integrated intensities of the 7F0 → 5D2, 7F0 → 5D4, and 7F0 → 5L6 transitions in the excitation spectrum for estimation and the integrated intensity of the 7F0 → 5D1 magnetic dipole transition for calibration. This approach facilitates an effortless derivation of the Ω6 intensity parameter, which is challenging to compute precisely by Krupke’s parametrisation of the emission spectrum and, therefore, often omitted in published research papers. Compared to the parametrisation of absorption spectra, the described method is more accurate, can be applied to any material form, and requires a single excitation spectrum.",
journal = "Scientific Reports",
title = "Self‑referenced method
for the Judd–Ofelt parametrisation
of the ­Eu3+ excitation spectrum",
volume = "12",
number = "1",
pages = "563",
doi = "10.1038/s41598-021-04651-4"
}

Ćirić, A., Marciniak, L.,& Dramićanin, M.. (2022). Self‑referenced method
for the Judd–Ofelt parametrisation
of the ­Eu3+ excitation spectrum. in Scientific Reports, 12(1), 563.
https://doi.org/10.1038/s41598-021-04651-4

Ćirić A, Marciniak L, Dramićanin M. Self‑referenced method
for the Judd–Ofelt parametrisation
of the ­Eu3+ excitation spectrum. in Scientific Reports. 2022;12(1):563.
doi:10.1038/s41598-021-04651-4 .

Ćirić, Aleksandar, Marciniak, Lukasz, Dramićanin, Miroslav, "Self‑referenced method
for the Judd–Ofelt parametrisation
of the ­Eu3+ excitation spectrum" in Scientific Reports, 12, no. 1 (2022):563,
https://doi.org/10.1038/s41598-021-04651-4 . .

TY  - JOUR
AU  - Martinović, Ana
AU  - Dramićanin, Miroslav
AU  - Ćirić, Aleksandar
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10188
AB  - Energy level positions, refractive index values, Judd–Ofelt (JO) intensity parameters, Slater integrals, and spin-orbit coupling parameters are taken from the literature for 27 Dy3+-doped materials (five crystals and 22 glasses). Investigated are only the transitions that are used for the Boltzmann-type luminescence intensity ratio (LIR) thermometers (transitions from the three thermalized levels, 4F9/2, 4I15/2, and 4G11/2 to the ground level). Reduced matrix elements of these three transitions are calculated from the Slater integrals and spin-orbit coupling parameters and they are compared to the most frequently used values from Carnall's tables. The comparison of JO parameters shows the smaller variation of the Ω6, related to rigidity, in crystal hosts than in glasses, and the opposite was observed for the Ω2,4 parameters. LIR performances are simulated by the JO thermometric model for each material by the conventional LIR and the LIR that exploits the third thermalized level. The comparison of the predicted figures of merit in luminescence thermometry reveals the most promising thermometric Dy3+ doped crystals and glasses. © 2022 Wiley-VCH GmbH
T2  - Advanced Theory and Simulations
T1  - Modeling the Performance of Dy3+-Based Boltzmann Thermometers by the Judd–Ofelt Theory
SP  - Early view
DO  - 10.1002/adts.202200029
ER  - 

@article{
author = "Martinović, Ana and Dramićanin, Miroslav and Ćirić, Aleksandar",
year = "2022",
abstract = "Energy level positions, refractive index values, Judd–Ofelt (JO) intensity parameters, Slater integrals, and spin-orbit coupling parameters are taken from the literature for 27 Dy3+-doped materials (five crystals and 22 glasses). Investigated are only the transitions that are used for the Boltzmann-type luminescence intensity ratio (LIR) thermometers (transitions from the three thermalized levels, 4F9/2, 4I15/2, and 4G11/2 to the ground level). Reduced matrix elements of these three transitions are calculated from the Slater integrals and spin-orbit coupling parameters and they are compared to the most frequently used values from Carnall's tables. The comparison of JO parameters shows the smaller variation of the Ω6, related to rigidity, in crystal hosts than in glasses, and the opposite was observed for the Ω2,4 parameters. LIR performances are simulated by the JO thermometric model for each material by the conventional LIR and the LIR that exploits the third thermalized level. The comparison of the predicted figures of merit in luminescence thermometry reveals the most promising thermometric Dy3+ doped crystals and glasses. © 2022 Wiley-VCH GmbH",
journal = "Advanced Theory and Simulations",
title = "Modeling the Performance of Dy3+-Based Boltzmann Thermometers by the Judd–Ofelt Theory",
pages = "Early view",
doi = "10.1002/adts.202200029"
}

Martinović, A., Dramićanin, M.,& Ćirić, A.. (2022). Modeling the Performance of Dy3+-Based Boltzmann Thermometers by the Judd–Ofelt Theory. in Advanced Theory and Simulations, Early view.
https://doi.org/10.1002/adts.202200029

Martinović A, Dramićanin M, Ćirić A. Modeling the Performance of Dy3+-Based Boltzmann Thermometers by the Judd–Ofelt Theory. in Advanced Theory and Simulations. 2022;:Early view.
doi:10.1002/adts.202200029 .

Martinović, Ana, Dramićanin, Miroslav, Ćirić, Aleksandar, "Modeling the Performance of Dy3+-Based Boltzmann Thermometers by the Judd–Ofelt Theory" in Advanced Theory and Simulations (2022):Early view,
https://doi.org/10.1002/adts.202200029 . .