TY  - JOUR
AU  - Milićević, Bojana R.
AU  - Periša, Jovana
AU  - Ristić, Zoran
AU  - Milenković, Katarina
AU  - Antić, Željka
AU  - Smits, Krisjanis
AU  - Kemere, Meldra
AU  - Vitols, Kaspars
AU  - Sarakovskis, Anatolijs
AU  - Dramićanin, Miroslav
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10590
AB  - We report the procedure for hydrothermal synthesis of ultrasmall Yb3+/Tm3+ co-doped Sr2LaF7 (SLF) upconversion phosphors. These phosphors were synthesized by varying the concentrations of Yb3+ (x = 10, 15, 20, and 25 mol%) and Tm3+ (y = 0.75, 1, 2, and 3 mol%) with the aim to analyze their emissions in the near IR spectral range. According to the detailed structural analysis, Yb3+ and Tm3+ occupy the La3+ sites in the SLF host. The addition of Yb3+/Tm3+ ions has a huge impact on the lattice constant, particle size, and PL emission properties of the synthesized SLF nanophosphor. The results show that the optimal dopant concentrations for upconversion luminescence of Yb3+/Tm3+ co-doped SLF are 20 mol% Yb3+ and 1 mol% Tm3+ with EDTA as the chelating agent. Under 980 nm light excitation, a strong upconversion emission of Tm3+ ions around 800 nm was achieved. In addition, the experimental photoluminescence lifetime of Tm3+ emission in the SLF host is reported. This study discovered that efficient near IR emission from ultrasmall Yb3+/Tm3+ co-doped SLF phosphors may have potential applications in the fields of fluorescent labels in bioimaging and security applications.
T2  - Nanomaterials
T1  - Hydrothermal Synthesis and Properties of Yb3+/Tm3+ Doped Sr2LaF7 Upconversion Nanoparticles
VL  - 13
IS  - 1
SP  - 30
DO  - 10.3390/nano13010030
ER  - 

@article{
author = "Milićević, Bojana R. and Periša, Jovana and Ristić, Zoran and Milenković, Katarina and Antić, Željka and Smits, Krisjanis and Kemere, Meldra and Vitols, Kaspars and Sarakovskis, Anatolijs and Dramićanin, Miroslav",
year = "2023",
abstract = "We report the procedure for hydrothermal synthesis of ultrasmall Yb3+/Tm3+ co-doped Sr2LaF7 (SLF) upconversion phosphors. These phosphors were synthesized by varying the concentrations of Yb3+ (x = 10, 15, 20, and 25 mol%) and Tm3+ (y = 0.75, 1, 2, and 3 mol%) with the aim to analyze their emissions in the near IR spectral range. According to the detailed structural analysis, Yb3+ and Tm3+ occupy the La3+ sites in the SLF host. The addition of Yb3+/Tm3+ ions has a huge impact on the lattice constant, particle size, and PL emission properties of the synthesized SLF nanophosphor. The results show that the optimal dopant concentrations for upconversion luminescence of Yb3+/Tm3+ co-doped SLF are 20 mol% Yb3+ and 1 mol% Tm3+ with EDTA as the chelating agent. Under 980 nm light excitation, a strong upconversion emission of Tm3+ ions around 800 nm was achieved. In addition, the experimental photoluminescence lifetime of Tm3+ emission in the SLF host is reported. This study discovered that efficient near IR emission from ultrasmall Yb3+/Tm3+ co-doped SLF phosphors may have potential applications in the fields of fluorescent labels in bioimaging and security applications.",
journal = "Nanomaterials",
title = "Hydrothermal Synthesis and Properties of Yb3+/Tm3+ Doped Sr2LaF7 Upconversion Nanoparticles",
volume = "13",
number = "1",
pages = "30",
doi = "10.3390/nano13010030"
}

Milićević, B. R., Periša, J., Ristić, Z., Milenković, K., Antić, Ž., Smits, K., Kemere, M., Vitols, K., Sarakovskis, A.,& Dramićanin, M.. (2023). Hydrothermal Synthesis and Properties of Yb3+/Tm3+ Doped Sr2LaF7 Upconversion Nanoparticles. in Nanomaterials, 13(1), 30.
https://doi.org/10.3390/nano13010030

Milićević BR, Periša J, Ristić Z, Milenković K, Antić Ž, Smits K, Kemere M, Vitols K, Sarakovskis A, Dramićanin M. Hydrothermal Synthesis and Properties of Yb3+/Tm3+ Doped Sr2LaF7 Upconversion Nanoparticles. in Nanomaterials. 2023;13(1):30.
doi:10.3390/nano13010030 .

Milićević, Bojana R., Periša, Jovana, Ristić, Zoran, Milenković, Katarina, Antić, Željka, Smits, Krisjanis, Kemere, Meldra, Vitols, Kaspars, Sarakovskis, Anatolijs, Dramićanin, Miroslav, "Hydrothermal Synthesis and Properties of Yb3+/Tm3+ Doped Sr2LaF7 Upconversion Nanoparticles" in Nanomaterials, 13, no. 1 (2023):30,
https://doi.org/10.3390/nano13010030 . .

TY  - JOUR
AU  - Dolić, Slobodan D.
AU  - Jovanović, Dragana J.
AU  - Smits, Krisjanis
AU  - Babić, Biljana M.
AU  - Marinović-Cincović, Milena
AU  - Porobić, Slavica
AU  - Dramićanin, Miroslav
PY  - 2018
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0272884218317176
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7816
AB  - Monoclinic scheelite-type BiVO4 is currently considered as one of the most promising non-titania photocatalysts, wheras tetragonal zircon-type BiVO4 is still poorly understood. Herein, a new and simple synthetic approach was applied and nanostructured single-phase zircon-type BiVO4 was successfully prepared by a controllable ethylene-glycol colloidal route. In addition, nanostructured monoclinic scheelite-type BiVO4 powders were also fabricated through annealing of the as-prepared samples. A comparative study of the two BiVO4 polymorphs was conducted and it turned out that the novel synthetic approach had a significant impact on porosity and photocatalytic performance of zircon-structured BiVO4. All the prepared materials, as-prepared and annealed, were mesoporous, while measured values of specific surface area of some zircon-structured samples (∼34 m2/g) were ∼7 times higher than those reported thus far for this phase. Interestingly, for the first time, zircon-type BiVO4, previously considered to be a poor photocatalyst, exhibited a better overall performance in degradation of methyl orange compared to monoclinic scheelite-type BiVO4. Hence, it could be expected that the here-presented synthesis and observations will both arouse interest in scarcely studied tetragonal zircon-type BiVO4 and facilitate as well as speed up further research of its properties. © 2018 Elsevier Ltd and Techna Group S.r.l.
T2  - Ceramics International
T1  - A comparative study of photocatalytically active nanocrystalline tetragonal zyrcon-type and monoclinic scheelite-type bismuth vanadate
VL  - 44
IS  - 15
SP  - 17953
EP  - 17961
DO  - 10.1016/j.ceramint.2018.06.272
ER  - 

@article{
author = "Dolić, Slobodan D. and Jovanović, Dragana J. and Smits, Krisjanis and Babić, Biljana M. and Marinović-Cincović, Milena and Porobić, Slavica and Dramićanin, Miroslav",
year = "2018",
abstract = "Monoclinic scheelite-type BiVO4 is currently considered as one of the most promising non-titania photocatalysts, wheras tetragonal zircon-type BiVO4 is still poorly understood. Herein, a new and simple synthetic approach was applied and nanostructured single-phase zircon-type BiVO4 was successfully prepared by a controllable ethylene-glycol colloidal route. In addition, nanostructured monoclinic scheelite-type BiVO4 powders were also fabricated through annealing of the as-prepared samples. A comparative study of the two BiVO4 polymorphs was conducted and it turned out that the novel synthetic approach had a significant impact on porosity and photocatalytic performance of zircon-structured BiVO4. All the prepared materials, as-prepared and annealed, were mesoporous, while measured values of specific surface area of some zircon-structured samples (∼34 m2/g) were ∼7 times higher than those reported thus far for this phase. Interestingly, for the first time, zircon-type BiVO4, previously considered to be a poor photocatalyst, exhibited a better overall performance in degradation of methyl orange compared to monoclinic scheelite-type BiVO4. Hence, it could be expected that the here-presented synthesis and observations will both arouse interest in scarcely studied tetragonal zircon-type BiVO4 and facilitate as well as speed up further research of its properties. © 2018 Elsevier Ltd and Techna Group S.r.l.",
journal = "Ceramics International",
title = "A comparative study of photocatalytically active nanocrystalline tetragonal zyrcon-type and monoclinic scheelite-type bismuth vanadate",
volume = "44",
number = "15",
pages = "17953-17961",
doi = "10.1016/j.ceramint.2018.06.272"
}

Dolić, S. D., Jovanović, D. J., Smits, K., Babić, B. M., Marinović-Cincović, M., Porobić, S.,& Dramićanin, M.. (2018). A comparative study of photocatalytically active nanocrystalline tetragonal zyrcon-type and monoclinic scheelite-type bismuth vanadate. in Ceramics International, 44(15), 17953-17961.
https://doi.org/10.1016/j.ceramint.2018.06.272

Dolić SD, Jovanović DJ, Smits K, Babić BM, Marinović-Cincović M, Porobić S, Dramićanin M. A comparative study of photocatalytically active nanocrystalline tetragonal zyrcon-type and monoclinic scheelite-type bismuth vanadate. in Ceramics International. 2018;44(15):17953-17961.
doi:10.1016/j.ceramint.2018.06.272 .

Dolić, Slobodan D., Jovanović, Dragana J., Smits, Krisjanis, Babić, Biljana M., Marinović-Cincović, Milena, Porobić, Slavica, Dramićanin, Miroslav, "A comparative study of photocatalytically active nanocrystalline tetragonal zyrcon-type and monoclinic scheelite-type bismuth vanadate" in Ceramics International, 44, no. 15 (2018):17953-17961,
https://doi.org/10.1016/j.ceramint.2018.06.272 . .

TY  - JOUR
AU  - Gavrilović, Tamara V.
AU  - Laganovska, Katrina
AU  - Zolotarjovs, Aleksejs
AU  - Smits, Krisjanis
AU  - Jovanović, Dragana J.
AU  - Dramićanin, Miroslav
PY  - 2018
UR  - http://linkinghub.elsevier.com/retrieve/pii/S0925346718303136
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7690
AB  - Nanoparticles (5 nm) and nanorods (2 nm × 15 nm and 4 nm × 20 nm) of monoclinic monazite LaPO4:Eu3+were prepared by reverse micelle and co-precipitation techniques. Effects of the particle size and surface defects on the intensity of luminescence and the emission spectrum shapes were analyzed by high resolution spectroscopy under laser (266 nm) and X-rays excitation. All synthesized LaPO4:Eu3+samples showed similar spectral features with characteristic Eu3+ions emission bands:5D0→7F0centered at 578.4 nm, magnetic-dipole transition5D0→7F1at 588–595 nm, electric-dipole transition5D0→7F2at 611.5–620.5 nm,5D0→7F3at (648–652 nm) and5D0→7F4at (684–702.5 nm), with the most dominant electric-dipole5D0→7F2transition. Additionally, the thermally stimulated luminescence was studied for the most dominant peak at 611.5 nm. It was shown that the Eu3+doping creates traps in all samples. Two prominent and well resolved glow peaks at 58.7 K and 172.3 K were detected for 5 nm nanoparticles, while low-intensity glow-peaks at 212.1 K and 212.2 K were observed in the X-rays irradiated nanorods. Displayed glows could be attributed to free and bound electrons and holes or to the recombination of electrons of ionized oxygen vacancies with photogenerated holes. To obtain information about the processes and specific defect type it is necessary to carry out additional analysis for all synthesized samples. The glow curves were analyzed and trap parameters were estimated and discussed throughout the paper.
T2  - Optical Materials
T1  - High resolution luminescence spectroscopy and thermoluminescence of different size LaPO4:Eu3+ nanoparticles
VL  - 82
SP  - 39
EP  - 46
DO  - 10.1016/j.optmat.2018.05.042
ER  - 

@article{
author = "Gavrilović, Tamara V. and Laganovska, Katrina and Zolotarjovs, Aleksejs and Smits, Krisjanis and Jovanović, Dragana J. and Dramićanin, Miroslav",
year = "2018",
abstract = "Nanoparticles (5 nm) and nanorods (2 nm × 15 nm and 4 nm × 20 nm) of monoclinic monazite LaPO4:Eu3+were prepared by reverse micelle and co-precipitation techniques. Effects of the particle size and surface defects on the intensity of luminescence and the emission spectrum shapes were analyzed by high resolution spectroscopy under laser (266 nm) and X-rays excitation. All synthesized LaPO4:Eu3+samples showed similar spectral features with characteristic Eu3+ions emission bands:5D0→7F0centered at 578.4 nm, magnetic-dipole transition5D0→7F1at 588–595 nm, electric-dipole transition5D0→7F2at 611.5–620.5 nm,5D0→7F3at (648–652 nm) and5D0→7F4at (684–702.5 nm), with the most dominant electric-dipole5D0→7F2transition. Additionally, the thermally stimulated luminescence was studied for the most dominant peak at 611.5 nm. It was shown that the Eu3+doping creates traps in all samples. Two prominent and well resolved glow peaks at 58.7 K and 172.3 K were detected for 5 nm nanoparticles, while low-intensity glow-peaks at 212.1 K and 212.2 K were observed in the X-rays irradiated nanorods. Displayed glows could be attributed to free and bound electrons and holes or to the recombination of electrons of ionized oxygen vacancies with photogenerated holes. To obtain information about the processes and specific defect type it is necessary to carry out additional analysis for all synthesized samples. The glow curves were analyzed and trap parameters were estimated and discussed throughout the paper.",
journal = "Optical Materials",
title = "High resolution luminescence spectroscopy and thermoluminescence of different size LaPO4:Eu3+ nanoparticles",
volume = "82",
pages = "39-46",
doi = "10.1016/j.optmat.2018.05.042"
}

Gavrilović, T. V., Laganovska, K., Zolotarjovs, A., Smits, K., Jovanović, D. J.,& Dramićanin, M.. (2018). High resolution luminescence spectroscopy and thermoluminescence of different size LaPO4:Eu3+ nanoparticles. in Optical Materials, 82, 39-46.
https://doi.org/10.1016/j.optmat.2018.05.042

Gavrilović TV, Laganovska K, Zolotarjovs A, Smits K, Jovanović DJ, Dramićanin M. High resolution luminescence spectroscopy and thermoluminescence of different size LaPO4:Eu3+ nanoparticles. in Optical Materials. 2018;82:39-46.
doi:10.1016/j.optmat.2018.05.042 .

Gavrilović, Tamara V., Laganovska, Katrina, Zolotarjovs, Aleksejs, Smits, Krisjanis, Jovanović, Dragana J., Dramićanin, Miroslav, "High resolution luminescence spectroscopy and thermoluminescence of different size LaPO4:Eu3+ nanoparticles" in Optical Materials, 82 (2018):39-46,
https://doi.org/10.1016/j.optmat.2018.05.042 . .

TY  - JOUR
AU  - Jovanović, Dragana J.
AU  - Gavrilović, Tamara V.
AU  - Dolić, Slobodan D.
AU  - Marinović-Cincović, Milena
AU  - Smits, Krisjanis
AU  - Dramićanin, Miroslav
PY  - 2018
UR  - http://linkinghub.elsevier.com/retrieve/pii/S0925346718303045
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7691
AB  - © 2018 Elsevier B.V. In recent years, there exists a tendency in research of up-conversion materials to shift excitation from 980 nm to shorter wavelengths. Here, in order to produce up-conversion luminescence emission of GdVO4-based materials under 808 nm excitation, polycrystalline powders of GdVO4:Er3+/Nd3+and GdVO4:Ho3+/Nd3+were successfully prepared by a high-temperature solid-state reaction technique. The prepared powders were highly crystalline with a single-phase zircon-type GdVO4structure and consisted of micrometer-sized irregular spherical particles (2–6 μm in diameter). In all studied samples, visible up-conversion luminescence was successfully achieved under 808 nm illumination. Near-infrared pumping produced emission bands in the green, yellow-orange and green regions of the visible spectrum. The bands in the green and red regions of GdVO4: Er3+/Nd3+as well as GdVO4:Ho3+/Nd3+were, respectively, characteristic of Er3+and Ho3+ions. The dominant band originating from the4G7/2→4I11/2transition in Nd3+ions was observed around 597 nm in all samples.
T2  - Optical Materials
T1  - Up-conversion luminescence of GdVO4:Nd3+/Er3+ and GdVO4:Nd3+/Ho3+ phosphors under 808 nm excitation
VL  - 82
SP  - 1
EP  - 6
DO  - 10.1016/j.optmat.2018.05.033
ER  - 

@article{
author = "Jovanović, Dragana J. and Gavrilović, Tamara V. and Dolić, Slobodan D. and Marinović-Cincović, Milena and Smits, Krisjanis and Dramićanin, Miroslav",
year = "2018",
abstract = "© 2018 Elsevier B.V. In recent years, there exists a tendency in research of up-conversion materials to shift excitation from 980 nm to shorter wavelengths. Here, in order to produce up-conversion luminescence emission of GdVO4-based materials under 808 nm excitation, polycrystalline powders of GdVO4:Er3+/Nd3+and GdVO4:Ho3+/Nd3+were successfully prepared by a high-temperature solid-state reaction technique. The prepared powders were highly crystalline with a single-phase zircon-type GdVO4structure and consisted of micrometer-sized irregular spherical particles (2–6 μm in diameter). In all studied samples, visible up-conversion luminescence was successfully achieved under 808 nm illumination. Near-infrared pumping produced emission bands in the green, yellow-orange and green regions of the visible spectrum. The bands in the green and red regions of GdVO4: Er3+/Nd3+as well as GdVO4:Ho3+/Nd3+were, respectively, characteristic of Er3+and Ho3+ions. The dominant band originating from the4G7/2→4I11/2transition in Nd3+ions was observed around 597 nm in all samples.",
journal = "Optical Materials",
title = "Up-conversion luminescence of GdVO4:Nd3+/Er3+ and GdVO4:Nd3+/Ho3+ phosphors under 808 nm excitation",
volume = "82",
pages = "1-6",
doi = "10.1016/j.optmat.2018.05.033"
}

Jovanović, D. J., Gavrilović, T. V., Dolić, S. D., Marinović-Cincović, M., Smits, K.,& Dramićanin, M.. (2018). Up-conversion luminescence of GdVO4:Nd3+/Er3+ and GdVO4:Nd3+/Ho3+ phosphors under 808 nm excitation. in Optical Materials, 82, 1-6.
https://doi.org/10.1016/j.optmat.2018.05.033

Jovanović DJ, Gavrilović TV, Dolić SD, Marinović-Cincović M, Smits K, Dramićanin M. Up-conversion luminescence of GdVO4:Nd3+/Er3+ and GdVO4:Nd3+/Ho3+ phosphors under 808 nm excitation. in Optical Materials. 2018;82:1-6.
doi:10.1016/j.optmat.2018.05.033 .

Jovanović, Dragana J., Gavrilović, Tamara V., Dolić, Slobodan D., Marinović-Cincović, Milena, Smits, Krisjanis, Dramićanin, Miroslav, "Up-conversion luminescence of GdVO4:Nd3+/Er3+ and GdVO4:Nd3+/Ho3+ phosphors under 808 nm excitation" in Optical Materials, 82 (2018):1-6,
https://doi.org/10.1016/j.optmat.2018.05.033 . .

TY  - JOUR
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7585
AB  - In this work, we focused on the syntheses, structure and spectroscopic properties of GdVO4:Dy3+ and DyVO4 (nano)particles of different sizes and shapes (spherical nanoparticles of 2 nm, 4 nm, and 20 nm in size, nanorods with a few nanometers in diameter and up to 10-20 nm in length and microparticles of 1 -8 mu m) obtained by four synthetic methods. The size effect on the structure, Raman active modes, and photoluminescence emission intensities was analyzed by X-ray diffraction, Raman and photo-luminescence spectroscopy, scanning and transmission electron microscopy, and diffuse reflection spectroscopy. All X-ray diffraction patterns clearly indicated presence of a single tetragonal zircon-type phase; absence of impurity phases indicate that the dopant Dy3+ ions were successfully and uniformly incorporated into the GdVO4 host lattice due to the equal valence and similar ionic radii. Micro-Raman measurements support the XRD measurements and showed Raman-active modes of the REVO4 systems (RE = Gd, Dy). The difference between the two hosts in the diffuse reflectance spectra was observed and it could be attributed to more effective Gd3+ ions on the charge transfer bands and different polarization (compared to bulk material) in smaller nanoparticles. Photoluminescence spectroscopy showed several bands in the visible and near-infrared regions which can be exclusively attributed to the f-f transitions of Dy3+ ions. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Optical Materials
T1  - Synthesis, structure and spectroscopic properties of luminescent GdVO4:Dy3+ and DyVO4 particles
VL  - 76
SP  - 308
EP  - 316
DO  - 10.1016/j.optmat.2017.12.046
ER  - 

@article{
year = "2018",
abstract = "In this work, we focused on the syntheses, structure and spectroscopic properties of GdVO4:Dy3+ and DyVO4 (nano)particles of different sizes and shapes (spherical nanoparticles of 2 nm, 4 nm, and 20 nm in size, nanorods with a few nanometers in diameter and up to 10-20 nm in length and microparticles of 1 -8 mu m) obtained by four synthetic methods. The size effect on the structure, Raman active modes, and photoluminescence emission intensities was analyzed by X-ray diffraction, Raman and photo-luminescence spectroscopy, scanning and transmission electron microscopy, and diffuse reflection spectroscopy. All X-ray diffraction patterns clearly indicated presence of a single tetragonal zircon-type phase; absence of impurity phases indicate that the dopant Dy3+ ions were successfully and uniformly incorporated into the GdVO4 host lattice due to the equal valence and similar ionic radii. Micro-Raman measurements support the XRD measurements and showed Raman-active modes of the REVO4 systems (RE = Gd, Dy). The difference between the two hosts in the diffuse reflectance spectra was observed and it could be attributed to more effective Gd3+ ions on the charge transfer bands and different polarization (compared to bulk material) in smaller nanoparticles. Photoluminescence spectroscopy showed several bands in the visible and near-infrared regions which can be exclusively attributed to the f-f transitions of Dy3+ ions. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Optical Materials",
title = "Synthesis, structure and spectroscopic properties of luminescent GdVO4:Dy3+ and DyVO4 particles",
volume = "76",
pages = "308-316",
doi = "10.1016/j.optmat.2017.12.046"
}

(2018). Synthesis, structure and spectroscopic properties of luminescent GdVO4:Dy3+ and DyVO4 particles. in Optical Materials, 76, 308-316.
https://doi.org/10.1016/j.optmat.2017.12.046

Synthesis, structure and spectroscopic properties of luminescent GdVO4:Dy3+ and DyVO4 particles. in Optical Materials. 2018;76:308-316.
doi:10.1016/j.optmat.2017.12.046 .

"Synthesis, structure and spectroscopic properties of luminescent GdVO4:Dy3+ and DyVO4 particles" in Optical Materials, 76 (2018):308-316,
https://doi.org/10.1016/j.optmat.2017.12.046 . .

TY  - JOUR
AU  - Gavrilović, Tamara V.
AU  - Periša, Jovana
AU  - Papan, Jelena
AU  - Vuković, Katarina
AU  - Smits, Krisjanis
AU  - Jovanović, Dragana J.
AU  - Dramićanin, Miroslav
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1881
AB  - This paper provides the detailed study of (nano) particles size effect on structural and luminescent properties of LaPO4: Eu3+ synthesized by four different methods: high temperature solid-state, co-precipitation, reverse micelle and colloidal. These methods delivered monoclinic monazite-phase submicron particles ( GT 100 nm), 4 x 20 nm nanorods and 5 nm spheres (depending on the annealing temperature), 2 x 15 nm nanorods, and ultrasmall spheres (2 nm), respectively. The analysis of emission intensity dependence on Eu3+ concentration showed that quenching concentration increases with a decrease of the particle size. The critical distance for energy transfer between Eu3+ ions is found to be 18.2 angstrom, and the dipole-dipole interaction is the dominant mechanism responsible for the concentration quenching of emission. With the increase in Eu3+ concentration, the unit-cell parameter slightly increases to accommodate larger Eu3+ ions at sites of smaller La3+ ions. Photoluminescent emission spectra presented four characteristic bands in the red spectral region: at 592 nm (D-5(0) - GT F-7(1)), at 612 nm (D-5(0) - GT F-7(2)), at 652 nm (D-5(0) - GT F-7(3)) and at 684 nm (D-5(0) - GT F-7(4)), while in small colloidal nanoparticles additional emission bands from host defects appear at shorter wavelengths. Intensities of f-f electronic transitions change with particles size due to small changes in symmetry around europium sites, while emission bandwidths increase with the reduction of particle size due to increased structural disorder. Judd-Ofelt analysis showed that internal quantum yield of Eu3+ emission is strongly influenced by particles morphology.
T2  - Journal of Luminescence
T1  - Particle size effects on the structure and emission of Eu3+: LaPO4 and EuPO4 phosphors
VL  - 195
SP  - 420
EP  - 429
DO  - 10.1016/j.jlumin.2017.12.002
ER  - 

@article{
author = "Gavrilović, Tamara V. and Periša, Jovana and Papan, Jelena and Vuković, Katarina and Smits, Krisjanis and Jovanović, Dragana J. and Dramićanin, Miroslav",
year = "2018",
abstract = "This paper provides the detailed study of (nano) particles size effect on structural and luminescent properties of LaPO4: Eu3+ synthesized by four different methods: high temperature solid-state, co-precipitation, reverse micelle and colloidal. These methods delivered monoclinic monazite-phase submicron particles ( GT 100 nm), 4 x 20 nm nanorods and 5 nm spheres (depending on the annealing temperature), 2 x 15 nm nanorods, and ultrasmall spheres (2 nm), respectively. The analysis of emission intensity dependence on Eu3+ concentration showed that quenching concentration increases with a decrease of the particle size. The critical distance for energy transfer between Eu3+ ions is found to be 18.2 angstrom, and the dipole-dipole interaction is the dominant mechanism responsible for the concentration quenching of emission. With the increase in Eu3+ concentration, the unit-cell parameter slightly increases to accommodate larger Eu3+ ions at sites of smaller La3+ ions. Photoluminescent emission spectra presented four characteristic bands in the red spectral region: at 592 nm (D-5(0) - GT F-7(1)), at 612 nm (D-5(0) - GT F-7(2)), at 652 nm (D-5(0) - GT F-7(3)) and at 684 nm (D-5(0) - GT F-7(4)), while in small colloidal nanoparticles additional emission bands from host defects appear at shorter wavelengths. Intensities of f-f electronic transitions change with particles size due to small changes in symmetry around europium sites, while emission bandwidths increase with the reduction of particle size due to increased structural disorder. Judd-Ofelt analysis showed that internal quantum yield of Eu3+ emission is strongly influenced by particles morphology.",
journal = "Journal of Luminescence",
title = "Particle size effects on the structure and emission of Eu3+: LaPO4 and EuPO4 phosphors",
volume = "195",
pages = "420-429",
doi = "10.1016/j.jlumin.2017.12.002"
}

Gavrilović, T. V., Periša, J., Papan, J., Vuković, K., Smits, K., Jovanović, D. J.,& Dramićanin, M.. (2018). Particle size effects on the structure and emission of Eu3+: LaPO4 and EuPO4 phosphors. in Journal of Luminescence, 195, 420-429.
https://doi.org/10.1016/j.jlumin.2017.12.002

Gavrilović TV, Periša J, Papan J, Vuković K, Smits K, Jovanović DJ, Dramićanin M. Particle size effects on the structure and emission of Eu3+: LaPO4 and EuPO4 phosphors. in Journal of Luminescence. 2018;195:420-429.
doi:10.1016/j.jlumin.2017.12.002 .

Gavrilović, Tamara V., Periša, Jovana, Papan, Jelena, Vuković, Katarina, Smits, Krisjanis, Jovanović, Dragana J., Dramićanin, Miroslav, "Particle size effects on the structure and emission of Eu3+: LaPO4 and EuPO4 phosphors" in Journal of Luminescence, 195 (2018):420-429,
https://doi.org/10.1016/j.jlumin.2017.12.002 . .

TY  - JOUR
AU  - Labrador-Paez, Lucia
AU  - Jovanović, Dragana J.
AU  - Marques, Manuel I.
AU  - Smits, Krisjanis
AU  - Dolić, Slobodan D.
AU  - Jaque, Francisco
AU  - Eugene Stanley, Harry
AU  - Dramićanin, Miroslav
AU  - Garcia-Sole, Jose
AU  - Haro-Gonzalez, Patricia
AU  - Jaque, Daniel
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1672
AB  - Nowadays a large variety of applications are based on solid nanoparticles dispersed in liquids-so called nanofluids. The interaction between the fluid and the nanoparticles plays a decisive role in the physical properties of the nanofluid. A novel approach based on the nonradiative energy transfer between two small luminescent nanocrystals (GdVO4:Nd3+ and GdVO4:Yb3+) dispersed in water is used in this work to investigate how temperature affects both the processes of interaction between nanoparticles and the effect of the fluid on the nanoparticles. From a systematic analysis of the effect of temperature on the GdVO4:Nd3+. GdVO4:Yb3+ interparticle energy transfer, it can be concluded that a dramatic increase in the energy transfer efficiency occurs for temperatures above 45 degrees C. This change is properly explained by taking into account a crossover existing in diverse water properties that occurs at about this temperature. The obtained results allow elucidation on the molecular arrangement of water molecules below and above this crossover temperature. In addition, it is observed that an energy transfer process is produced as a result of interparticle collisions that induce irreversible ion exchange between the interacting nanoparticles.
T2  - Small
T1  - Unveiling Molecular Changes in Water by Small Luminescent Nanoparticles
VL  - 13
IS  - 30
DO  - 10.1002/smll.201700968
ER  - 

@article{
author = "Labrador-Paez, Lucia and Jovanović, Dragana J. and Marques, Manuel I. and Smits, Krisjanis and Dolić, Slobodan D. and Jaque, Francisco and Eugene Stanley, Harry and Dramićanin, Miroslav and Garcia-Sole, Jose and Haro-Gonzalez, Patricia and Jaque, Daniel",
year = "2017",
abstract = "Nowadays a large variety of applications are based on solid nanoparticles dispersed in liquids-so called nanofluids. The interaction between the fluid and the nanoparticles plays a decisive role in the physical properties of the nanofluid. A novel approach based on the nonradiative energy transfer between two small luminescent nanocrystals (GdVO4:Nd3+ and GdVO4:Yb3+) dispersed in water is used in this work to investigate how temperature affects both the processes of interaction between nanoparticles and the effect of the fluid on the nanoparticles. From a systematic analysis of the effect of temperature on the GdVO4:Nd3+. GdVO4:Yb3+ interparticle energy transfer, it can be concluded that a dramatic increase in the energy transfer efficiency occurs for temperatures above 45 degrees C. This change is properly explained by taking into account a crossover existing in diverse water properties that occurs at about this temperature. The obtained results allow elucidation on the molecular arrangement of water molecules below and above this crossover temperature. In addition, it is observed that an energy transfer process is produced as a result of interparticle collisions that induce irreversible ion exchange between the interacting nanoparticles.",
journal = "Small",
title = "Unveiling Molecular Changes in Water by Small Luminescent Nanoparticles",
volume = "13",
number = "30",
doi = "10.1002/smll.201700968"
}

Labrador-Paez, L., Jovanović, D. J., Marques, M. I., Smits, K., Dolić, S. D., Jaque, F., Eugene Stanley, H., Dramićanin, M., Garcia-Sole, J., Haro-Gonzalez, P.,& Jaque, D.. (2017). Unveiling Molecular Changes in Water by Small Luminescent Nanoparticles. in Small, 13(30).
https://doi.org/10.1002/smll.201700968

Labrador-Paez L, Jovanović DJ, Marques MI, Smits K, Dolić SD, Jaque F, Eugene Stanley H, Dramićanin M, Garcia-Sole J, Haro-Gonzalez P, Jaque D. Unveiling Molecular Changes in Water by Small Luminescent Nanoparticles. in Small. 2017;13(30).
doi:10.1002/smll.201700968 .

Labrador-Paez, Lucia, Jovanović, Dragana J., Marques, Manuel I., Smits, Krisjanis, Dolić, Slobodan D., Jaque, Francisco, Eugene Stanley, Harry, Dramićanin, Miroslav, Garcia-Sole, Jose, Haro-Gonzalez, Patricia, Jaque, Daniel, "Unveiling Molecular Changes in Water by Small Luminescent Nanoparticles" in Small, 13, no. 30 (2017),
https://doi.org/10.1002/smll.201700968 . .

TY  - JOUR
AU  - Papan, Jelena
AU  - Jovanović, Dragana J.
AU  - Vuković, Katarina
AU  - Smits, Krisjanis
AU  - Đorđević, Vesna R.
AU  - Dramićanin, Miroslav
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7132
AB  - The detailed analyses of structure and luminescence of europium(III)-doped A(2)Hf(2)O(7) (A = Y, Gd, Lu) nanoparticles is presented. Samples were prepared by time and cost effective combustion method that utilize polyethylene glycol both as a chelating agent and as a fuel, with different europium(III) concentrations (from 1 to 12 at.%), annealed at temperatures ranging from 800 to 1400 degrees C, and with alternating A(3+) cation in the A(2)Hf(2)O(7) host. Then, structural variations between materials were analysed by Xray diffraction and structural refinement, while the changes in the luminescence were assessed from the Judd-Ofelt analyses of emission spectra. Nanoparticles prepared at the lowest temperature (800 degrees C) had the smallest particle size of similar to 6 nm and showed the highest quantum efficiency when doped with 1 and 2 at.% of europium(III). Radiative transition rate and quantum efficiency of emission showed Lu2Hf2O7 GT Gd2Hf2O7 GT Y2Hf2O7 trend. (C) 2016 Elsevier B.V. All rights reserved.
T2  - Optical Materials
T1  - Europium(III)-doped A(2)Hf(2)O(7) (A = Y, Gd, Lu) nanoparticles: Influence of annealing temperature, europium(III) concentration and host cation on the luminescent properties
VL  - 61
SP  - 68
EP  - 76
DO  - 10.1016/j.optmat.2016.04.007
ER  - 

@article{
author = "Papan, Jelena and Jovanović, Dragana J. and Vuković, Katarina and Smits, Krisjanis and Đorđević, Vesna R. and Dramićanin, Miroslav",
year = "2016",
abstract = "The detailed analyses of structure and luminescence of europium(III)-doped A(2)Hf(2)O(7) (A = Y, Gd, Lu) nanoparticles is presented. Samples were prepared by time and cost effective combustion method that utilize polyethylene glycol both as a chelating agent and as a fuel, with different europium(III) concentrations (from 1 to 12 at.%), annealed at temperatures ranging from 800 to 1400 degrees C, and with alternating A(3+) cation in the A(2)Hf(2)O(7) host. Then, structural variations between materials were analysed by Xray diffraction and structural refinement, while the changes in the luminescence were assessed from the Judd-Ofelt analyses of emission spectra. Nanoparticles prepared at the lowest temperature (800 degrees C) had the smallest particle size of similar to 6 nm and showed the highest quantum efficiency when doped with 1 and 2 at.% of europium(III). Radiative transition rate and quantum efficiency of emission showed Lu2Hf2O7 GT Gd2Hf2O7 GT Y2Hf2O7 trend. (C) 2016 Elsevier B.V. All rights reserved.",
journal = "Optical Materials",
title = "Europium(III)-doped A(2)Hf(2)O(7) (A = Y, Gd, Lu) nanoparticles: Influence of annealing temperature, europium(III) concentration and host cation on the luminescent properties",
volume = "61",
pages = "68-76",
doi = "10.1016/j.optmat.2016.04.007"
}

Papan, J., Jovanović, D. J., Vuković, K., Smits, K., Đorđević, V. R.,& Dramićanin, M.. (2016). Europium(III)-doped A(2)Hf(2)O(7) (A = Y, Gd, Lu) nanoparticles: Influence of annealing temperature, europium(III) concentration and host cation on the luminescent properties. in Optical Materials, 61, 68-76.
https://doi.org/10.1016/j.optmat.2016.04.007

Papan J, Jovanović DJ, Vuković K, Smits K, Đorđević VR, Dramićanin M. Europium(III)-doped A(2)Hf(2)O(7) (A = Y, Gd, Lu) nanoparticles: Influence of annealing temperature, europium(III) concentration and host cation on the luminescent properties. in Optical Materials. 2016;61:68-76.
doi:10.1016/j.optmat.2016.04.007 .

Papan, Jelena, Jovanović, Dragana J., Vuković, Katarina, Smits, Krisjanis, Đorđević, Vesna R., Dramićanin, Miroslav, "Europium(III)-doped A(2)Hf(2)O(7) (A = Y, Gd, Lu) nanoparticles: Influence of annealing temperature, europium(III) concentration and host cation on the luminescent properties" in Optical Materials, 61 (2016):68-76,
https://doi.org/10.1016/j.optmat.2016.04.007 . .

TY  - JOUR
AU  - Gavrilović, Tamara V.
AU  - Jovanović, Dragana J.
AU  - Smits, Krisjanis
AU  - Dramićanin, Miroslav
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/937
AB  - Lanthanide-doped GdVO4 nanorods that exhibit upconversion emission under 982 nm excitation have been prepared by a facile room-temperature chemical co-precipitation method followed by a subsequent annealing at temperatures of 600 degrees C, 800 degrees C and 1000 degrees C. Multicolor upconversion emission, including white, was achieved by tuning the concentrations of dopant lanthanide ions (Ho3+, Er3+, Tm3+ and Yb3+) in GdVO4. It is found that four GdVO4 samples emit light with the white chromaticity coordinates of (0.326, 0.339), (0.346, 0.343), (0.323, 0327) and (0.342, 0.340) respectively, under a single-wavelength NIR excitation. These coordinates are very close to the standard equal energy white light coordinates (0333, 0.333) according to the 1931 CIE diagram. By varying dopant lanthanide concentrations in nanorods it is possible to produce upconversion emission with colors between red (0.504, 0369), green (0.282, 0.577) and blue (0.142, 0.125) coordinates. (C) 2015 Elsevier Ltd. All rights reserved.
PB  - Elsevier
T2  - Dyes and Pigments
T1  - Multicolor upconversion luminescence of GdVO4:Ln(3+)/Yb3+ (Ln(3+) = Ho3+, Er3+, Tm3+, Ho3+/Er3+/Tm3+) nanorods
VL  - 126
SP  - 1
EP  - 7
DO  - 10.1016/j.dyepig.2015.11.005
ER  - 

@article{
author = "Gavrilović, Tamara V. and Jovanović, Dragana J. and Smits, Krisjanis and Dramićanin, Miroslav",
year = "2016",
abstract = "Lanthanide-doped GdVO4 nanorods that exhibit upconversion emission under 982 nm excitation have been prepared by a facile room-temperature chemical co-precipitation method followed by a subsequent annealing at temperatures of 600 degrees C, 800 degrees C and 1000 degrees C. Multicolor upconversion emission, including white, was achieved by tuning the concentrations of dopant lanthanide ions (Ho3+, Er3+, Tm3+ and Yb3+) in GdVO4. It is found that four GdVO4 samples emit light with the white chromaticity coordinates of (0.326, 0.339), (0.346, 0.343), (0.323, 0327) and (0.342, 0.340) respectively, under a single-wavelength NIR excitation. These coordinates are very close to the standard equal energy white light coordinates (0333, 0.333) according to the 1931 CIE diagram. By varying dopant lanthanide concentrations in nanorods it is possible to produce upconversion emission with colors between red (0.504, 0369), green (0.282, 0.577) and blue (0.142, 0.125) coordinates. (C) 2015 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier",
journal = "Dyes and Pigments",
title = "Multicolor upconversion luminescence of GdVO4:Ln(3+)/Yb3+ (Ln(3+) = Ho3+, Er3+, Tm3+, Ho3+/Er3+/Tm3+) nanorods",
volume = "126",
pages = "1-7",
doi = "10.1016/j.dyepig.2015.11.005"
}

Gavrilović, T. V., Jovanović, D. J., Smits, K.,& Dramićanin, M.. (2016). Multicolor upconversion luminescence of GdVO4:Ln(3+)/Yb3+ (Ln(3+) = Ho3+, Er3+, Tm3+, Ho3+/Er3+/Tm3+) nanorods. in Dyes and Pigments
Elsevier., 126, 1-7.
https://doi.org/10.1016/j.dyepig.2015.11.005

Gavrilović TV, Jovanović DJ, Smits K, Dramićanin M. Multicolor upconversion luminescence of GdVO4:Ln(3+)/Yb3+ (Ln(3+) = Ho3+, Er3+, Tm3+, Ho3+/Er3+/Tm3+) nanorods. in Dyes and Pigments. 2016;126:1-7.
doi:10.1016/j.dyepig.2015.11.005 .

Gavrilović, Tamara V., Jovanović, Dragana J., Smits, Krisjanis, Dramićanin, Miroslav, "Multicolor upconversion luminescence of GdVO4:Ln(3+)/Yb3+ (Ln(3+) = Ho3+, Er3+, Tm3+, Ho3+/Er3+/Tm3+) nanorods" in Dyes and Pigments, 126 (2016):1-7,
https://doi.org/10.1016/j.dyepig.2015.11.005 . .