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  - Milićević, Bojana R.
AU  - Đorđević, Vesna R.
AU  - Vuković, Katarina
AU  - Dražić, Goran
AU  - Dramićanin, Miroslav
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1799
AB  - Sol-gel technique for the synthesis of anatase TiO2 at 420 degrees C produces nanocrystals of 10-20 nm in size with Ti4+ in crystal volume and Ti3+ at terminal planes of the crystal. The study of Li+ co-doping effects on the structure, morphology, absorption, and luminescence of Eu3+ activated TiO2 anatase nanocrystals is presented. Pure anatase structure is achieved up to 9 at.% Li, with significant improvement in crystallinity of europium doped anatase TiO2. The Li+ co-doping reduces the unit cell volume of the crystal, induces the blue shift of the absorption edge, lengthens the lifetime of Eu3+ D-5(0) excited state, and improves the Eu3+ emission intensity up to 37.5%. Judd-Ofelt analysis of Eu3+ emission showed enhancement of quantum efficiency from 66.4% to 98.7% when TiO2:Eu3+ was co-doped with 9 at.% of Li. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Optical Materials
T1  - Effects of Li+ co-doping on properties of Eu3+ activated TiO2 anatase nanoparticles
VL  - 72
SP  - 316
EP  - 322
DO  - 10.1016/j.optmat.2017.06.029
ER  - 

@article{
author = "Milićević, Bojana R. and Đorđević, Vesna R. and Vuković, Katarina and Dražić, Goran and Dramićanin, Miroslav",
year = "2017",
abstract = "Sol-gel technique for the synthesis of anatase TiO2 at 420 degrees C produces nanocrystals of 10-20 nm in size with Ti4+ in crystal volume and Ti3+ at terminal planes of the crystal. The study of Li+ co-doping effects on the structure, morphology, absorption, and luminescence of Eu3+ activated TiO2 anatase nanocrystals is presented. Pure anatase structure is achieved up to 9 at.% Li, with significant improvement in crystallinity of europium doped anatase TiO2. The Li+ co-doping reduces the unit cell volume of the crystal, induces the blue shift of the absorption edge, lengthens the lifetime of Eu3+ D-5(0) excited state, and improves the Eu3+ emission intensity up to 37.5%. Judd-Ofelt analysis of Eu3+ emission showed enhancement of quantum efficiency from 66.4% to 98.7% when TiO2:Eu3+ was co-doped with 9 at.% of Li. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Optical Materials",
title = "Effects of Li+ co-doping on properties of Eu3+ activated TiO2 anatase nanoparticles",
volume = "72",
pages = "316-322",
doi = "10.1016/j.optmat.2017.06.029"
}

Milićević, B. R., Đorđević, V. R., Vuković, K., Dražić, G.,& Dramićanin, M.. (2017). Effects of Li+ co-doping on properties of Eu3+ activated TiO2 anatase nanoparticles. in Optical Materials, 72, 316-322.
https://doi.org/10.1016/j.optmat.2017.06.029

Milićević BR, Đorđević VR, Vuković K, Dražić G, Dramićanin M. Effects of Li+ co-doping on properties of Eu3+ activated TiO2 anatase nanoparticles. in Optical Materials. 2017;72:316-322.
doi:10.1016/j.optmat.2017.06.029 .

Milićević, Bojana R., Đorđević, Vesna R., Vuković, Katarina, Dražić, Goran, Dramićanin, Miroslav, "Effects of Li+ co-doping on properties of Eu3+ activated TiO2 anatase nanoparticles" in Optical Materials, 72 (2017):316-322,
https://doi.org/10.1016/j.optmat.2017.06.029 . .

TY  - JOUR
AU  - Papan, Jelena
AU  - Vuković, Katarina
AU  - Ahrenkiel, Scott Phillip
AU  - Jovanović, Dragana J.
AU  - Dramićanin, Miroslav
PY  - 2017
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1586
AB  - Nanocrystalline Y2-xEuxZr2O7 (0 LT = x LT = 1) phosphor particles were prepared by polymer facilitated combustion and subsequent calcination at 800 degrees C. The thorough study of Eu-concentration influence on particles structure, morphology and luminescence is presented. This type of synthesis provides particles of similar to 5 nm in diameter, which crystallize in a defect fluorite structure (space group Fm-3m), and where each particle consists of a single crystallite, as revealed by X-ray diffraction and high-resolution transmission electron microscopy. With the increase of Eu concentration, the unit-cell parameter slightly increases to accommodate larger Eu3+ ions at sites of smaller Y3+, while the shape and size of particles remain the same. Analysis of emission intensity and decay dependence on Eu concentration showed that this host material could be heavily doped with Eu since concentration quenching of emission occurs at high Eu content of 25-30 at.% (with respect to Y ions). The critical distance for energy transfer between Eu ions is estimated to 10.28 A and dipole-quadrupole interaction is found as the dominant mechanism responsible for the concentration quenching of emission. Radiative and non-radiative transition rates, the quantum efficiency of emission, Omega-intensity parameters, and branching ratios of Eu3+ emission are calculated for nanocrystals of all doping concentrations. It is found that more to-the-point expression 86% of emission comes from D-5(0) - GT F-7(2) and D-5(0) - GT F-7(1) transitions. Therefore, this phosphor emits pure red light with (0.661, 0.338) CIE color coordinates. (C) 2017 Elsevier B.V. All rights reserved.
T2  - Journal of Alloys and Compounds
T1  - Detailed study of structural and luminescent properties of Y2-xEuxZr2O7 (0 LT = x LT = 1) nanophosphors
VL  - 712
SP  - 437
EP  - 444
DO  - 10.1016/j.jallcom.2017.04.139
ER  - 

@article{
author = "Papan, Jelena and Vuković, Katarina and Ahrenkiel, Scott Phillip and Jovanović, Dragana J. and Dramićanin, Miroslav",
year = "2017",
abstract = "Nanocrystalline Y2-xEuxZr2O7 (0 LT = x LT = 1) phosphor particles were prepared by polymer facilitated combustion and subsequent calcination at 800 degrees C. The thorough study of Eu-concentration influence on particles structure, morphology and luminescence is presented. This type of synthesis provides particles of similar to 5 nm in diameter, which crystallize in a defect fluorite structure (space group Fm-3m), and where each particle consists of a single crystallite, as revealed by X-ray diffraction and high-resolution transmission electron microscopy. With the increase of Eu concentration, the unit-cell parameter slightly increases to accommodate larger Eu3+ ions at sites of smaller Y3+, while the shape and size of particles remain the same. Analysis of emission intensity and decay dependence on Eu concentration showed that this host material could be heavily doped with Eu since concentration quenching of emission occurs at high Eu content of 25-30 at.% (with respect to Y ions). The critical distance for energy transfer between Eu ions is estimated to 10.28 A and dipole-quadrupole interaction is found as the dominant mechanism responsible for the concentration quenching of emission. Radiative and non-radiative transition rates, the quantum efficiency of emission, Omega-intensity parameters, and branching ratios of Eu3+ emission are calculated for nanocrystals of all doping concentrations. It is found that more to-the-point expression 86% of emission comes from D-5(0) - GT F-7(2) and D-5(0) - GT F-7(1) transitions. Therefore, this phosphor emits pure red light with (0.661, 0.338) CIE color coordinates. (C) 2017 Elsevier B.V. All rights reserved.",
journal = "Journal of Alloys and Compounds",
title = "Detailed study of structural and luminescent properties of Y2-xEuxZr2O7 (0 LT = x LT = 1) nanophosphors",
volume = "712",
pages = "437-444",
doi = "10.1016/j.jallcom.2017.04.139"
}

Papan, J., Vuković, K., Ahrenkiel, S. P., Jovanović, D. J.,& Dramićanin, M.. (2017). Detailed study of structural and luminescent properties of Y2-xEuxZr2O7 (0 LT = x LT = 1) nanophosphors. in Journal of Alloys and Compounds, 712, 437-444.
https://doi.org/10.1016/j.jallcom.2017.04.139

Papan J, Vuković K, Ahrenkiel SP, Jovanović DJ, Dramićanin M. Detailed study of structural and luminescent properties of Y2-xEuxZr2O7 (0 LT = x LT = 1) nanophosphors. in Journal of Alloys and Compounds. 2017;712:437-444.
doi:10.1016/j.jallcom.2017.04.139 .

Papan, Jelena, Vuković, Katarina, Ahrenkiel, Scott Phillip, Jovanović, Dragana J., Dramićanin, Miroslav, "Detailed study of structural and luminescent properties of Y2-xEuxZr2O7 (0 LT = x LT = 1) nanophosphors" in Journal of Alloys and Compounds, 712 (2017):437-444,
https://doi.org/10.1016/j.jallcom.2017.04.139 . .

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  - Antić, Željka
AU  - Prashanthi, Kovur
AU  - Ćulubrk, Sanja
AU  - Vuković, Katarina
AU  - Dramićanin, Miroslav
AU  - Thundat, Thomas
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/935
AB  - Here we report on preparation of Eu3+-doped Gd(2)Ti(2)O(7)pyrochlore luminescent thin films by pulsed laser deposition technique and their structural, morphological and optical characterization. The influence of annealing temperature and background gas (air vs. argon) on film photoluminescence is examined fort he optimization of post-deposition annealing conditions. As-deposited amorphous films become pure pyrochlore crystalline after calcination at temperatures higher than 1000 degrees C. Atomic force microscopy showed increase in the grain size from similar to 20 nm in the as-deposited to similar to 60 nm in the crystalline sample annealed at 1100 degrees C. Scanning electron microscopy showed dense films with the uniform thickness of about 700 nm. Luminescence spectra of crystalline films were complex and composed of better resolved emission lines than in the amorphous sample. Emission spectra showed that symmetry of Eu3+ sites become disturbed in annealed films due to the extrinsic thermal stress. Films treated in argon displayed similar emission and excitation spectral features like air-treated ones, but with better resolved emissionlines. Calculated quantum efficiency of emission showed that optimization of annealing conditions led to an enhancement of films luminescence. The highest quantum efficiency of emission and the longestlife time is found for the sample annealed at 1100 degrees C in presence of argon. Crown Copyright (C) 2015 Published by Elsevier B. V. All rights reserved.
PB  - Elsevier
T2  - Applied Surface Science
T1  - Effect of annealing conditions on structural and luminescencent properties of Eu3+-doped Gd2Ti2O7 thin films
VL  - 364
SP  - 273
EP  - 279
DO  - 10.1016/j.apsusc.2015.12.137
ER  - 

@article{
author = "Antić, Željka and Prashanthi, Kovur and Ćulubrk, Sanja and Vuković, Katarina and Dramićanin, Miroslav and Thundat, Thomas",
year = "2016",
abstract = "Here we report on preparation of Eu3+-doped Gd(2)Ti(2)O(7)pyrochlore luminescent thin films by pulsed laser deposition technique and their structural, morphological and optical characterization. The influence of annealing temperature and background gas (air vs. argon) on film photoluminescence is examined fort he optimization of post-deposition annealing conditions. As-deposited amorphous films become pure pyrochlore crystalline after calcination at temperatures higher than 1000 degrees C. Atomic force microscopy showed increase in the grain size from similar to 20 nm in the as-deposited to similar to 60 nm in the crystalline sample annealed at 1100 degrees C. Scanning electron microscopy showed dense films with the uniform thickness of about 700 nm. Luminescence spectra of crystalline films were complex and composed of better resolved emission lines than in the amorphous sample. Emission spectra showed that symmetry of Eu3+ sites become disturbed in annealed films due to the extrinsic thermal stress. Films treated in argon displayed similar emission and excitation spectral features like air-treated ones, but with better resolved emissionlines. Calculated quantum efficiency of emission showed that optimization of annealing conditions led to an enhancement of films luminescence. The highest quantum efficiency of emission and the longestlife time is found for the sample annealed at 1100 degrees C in presence of argon. Crown Copyright (C) 2015 Published by Elsevier B. V. All rights reserved.",
publisher = "Elsevier",
journal = "Applied Surface Science",
title = "Effect of annealing conditions on structural and luminescencent properties of Eu3+-doped Gd2Ti2O7 thin films",
volume = "364",
pages = "273-279",
doi = "10.1016/j.apsusc.2015.12.137"
}

Antić, Ž., Prashanthi, K., Ćulubrk, S., Vuković, K., Dramićanin, M.,& Thundat, T.. (2016). Effect of annealing conditions on structural and luminescencent properties of Eu3+-doped Gd2Ti2O7 thin films. in Applied Surface Science
Elsevier., 364, 273-279.
https://doi.org/10.1016/j.apsusc.2015.12.137

Antić Ž, Prashanthi K, Ćulubrk S, Vuković K, Dramićanin M, Thundat T. Effect of annealing conditions on structural and luminescencent properties of Eu3+-doped Gd2Ti2O7 thin films. in Applied Surface Science. 2016;364:273-279.
doi:10.1016/j.apsusc.2015.12.137 .

Antić, Željka, Prashanthi, Kovur, Ćulubrk, Sanja, Vuković, Katarina, Dramićanin, Miroslav, Thundat, Thomas, "Effect of annealing conditions on structural and luminescencent properties of Eu3+-doped Gd2Ti2O7 thin films" in Applied Surface Science, 364 (2016):273-279,
https://doi.org/10.1016/j.apsusc.2015.12.137 . .

TY  - JOUR
AU  - Brik, Mikhail G.
AU  - Antić, Željka
AU  - Vuković, Katarina
AU  - Dramićanin, Miroslav
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7084
AB  - Preparation and spectroscopic studies of the TiO2 nanopowders doped with Eu3+ ions are described. Efficient emission in the red part of the visible spectrum can be obtained due to the D-5(0) - GT F-7(2) emission of europium ions. Quantum efficiency of such emission was estimated to be about 0.83, which indicates a rather weak role of the non-radiative losses. However, the increase of Eu3+ concentration up to 10 at% significantly lowers the quantum efficiency because of the energy transfer and re-absorption processes. Higher doping concentrations (larger than 3 at% of Eu3+) also decrease the covalency of the Eu3+-O2- chemical bonds.
T2  - Materials Transactions. JIM / Japan Institute of Metals
T1  - Judd-Ofelt Analysis of Eu3+ Emission in TiO2 Anatase Nanoparticles
VL  - 56
IS  - 9
SP  - 1416
EP  - 1418
DO  - 10.2320/matertrans.MA201566
ER  - 

@article{
author = "Brik, Mikhail G. and Antić, Željka and Vuković, Katarina and Dramićanin, Miroslav",
year = "2015",
abstract = "Preparation and spectroscopic studies of the TiO2 nanopowders doped with Eu3+ ions are described. Efficient emission in the red part of the visible spectrum can be obtained due to the D-5(0) - GT F-7(2) emission of europium ions. Quantum efficiency of such emission was estimated to be about 0.83, which indicates a rather weak role of the non-radiative losses. However, the increase of Eu3+ concentration up to 10 at% significantly lowers the quantum efficiency because of the energy transfer and re-absorption processes. Higher doping concentrations (larger than 3 at% of Eu3+) also decrease the covalency of the Eu3+-O2- chemical bonds.",
journal = "Materials Transactions. JIM / Japan Institute of Metals",
title = "Judd-Ofelt Analysis of Eu3+ Emission in TiO2 Anatase Nanoparticles",
volume = "56",
number = "9",
pages = "1416-1418",
doi = "10.2320/matertrans.MA201566"
}

Brik, M. G., Antić, Ž., Vuković, K.,& Dramićanin, M.. (2015). Judd-Ofelt Analysis of Eu3+ Emission in TiO2 Anatase Nanoparticles. in Materials Transactions. JIM / Japan Institute of Metals, 56(9), 1416-1418.
https://doi.org/10.2320/matertrans.MA201566

Brik MG, Antić Ž, Vuković K, Dramićanin M. Judd-Ofelt Analysis of Eu3+ Emission in TiO2 Anatase Nanoparticles. in Materials Transactions. JIM / Japan Institute of Metals. 2015;56(9):1416-1418.
doi:10.2320/matertrans.MA201566 .

Brik, Mikhail G., Antić, Željka, Vuković, Katarina, Dramićanin, Miroslav, "Judd-Ofelt Analysis of Eu3+ Emission in TiO2 Anatase Nanoparticles" in Materials Transactions. JIM / Japan Institute of Metals, 56, no. 9 (2015):1416-1418,
https://doi.org/10.2320/matertrans.MA201566 . .

TY  - JOUR
AU  - Vuković, Katarina
AU  - Medić, Mina M.
AU  - Sekulić, Milica
AU  - Dramićanin, Miroslav
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/692
AB  - Eu3+ doped Mg-2 TiO4 (2 at% of Eu) nanoparticles which are 5 to 10 nm in diameter are prepared by Pechini-type polymerized complex route followed with the calcination in the temperature range from 400 degrees C to 700 degrees C. Emission spectra display characteristic D-5(0) - GT F-7(J) (J = 0, 1, 2, 3, and 4) spin forbidden f-f electronic transitions of the Eu3+ ions with the most pronounced emission coming from D-5(0) - GT F-7(2) transition and with the emission decays varying between 0.57 and 0.87ms for samples prepared at different temperatures. Judd-Ofelt theoretical analysis of the emission spectra of Eu3+ ions was performed, which allowed calculating radiative and nonradiative emission probabilities, Judd-Ofelt intensity parameters, and the quantum efficiency of the Eu3+ emission in the Mg-2 TiO4 nanoparticles. The analyses showed the existence of high asymmetry around the metal ion sites. Also, the largest quantum efficiency of emission of 58.5% is found in nanoparticles prepared at 600 degrees C.
T2  - Advances in Condensed Matter Physics
T1  - Analysis of Eu3+ Emission from Mg2TiO4 Nanoparticles by Judd-Ofelt Theory
DO  - 10.1155/2015/736517
ER  - 

@article{
author = "Vuković, Katarina and Medić, Mina M. and Sekulić, Milica and Dramićanin, Miroslav",
year = "2015",
abstract = "Eu3+ doped Mg-2 TiO4 (2 at% of Eu) nanoparticles which are 5 to 10 nm in diameter are prepared by Pechini-type polymerized complex route followed with the calcination in the temperature range from 400 degrees C to 700 degrees C. Emission spectra display characteristic D-5(0) - GT F-7(J) (J = 0, 1, 2, 3, and 4) spin forbidden f-f electronic transitions of the Eu3+ ions with the most pronounced emission coming from D-5(0) - GT F-7(2) transition and with the emission decays varying between 0.57 and 0.87ms for samples prepared at different temperatures. Judd-Ofelt theoretical analysis of the emission spectra of Eu3+ ions was performed, which allowed calculating radiative and nonradiative emission probabilities, Judd-Ofelt intensity parameters, and the quantum efficiency of the Eu3+ emission in the Mg-2 TiO4 nanoparticles. The analyses showed the existence of high asymmetry around the metal ion sites. Also, the largest quantum efficiency of emission of 58.5% is found in nanoparticles prepared at 600 degrees C.",
journal = "Advances in Condensed Matter Physics",
title = "Analysis of Eu3+ Emission from Mg2TiO4 Nanoparticles by Judd-Ofelt Theory",
doi = "10.1155/2015/736517"
}

Vuković, K., Medić, M. M., Sekulić, M.,& Dramićanin, M.. (2015). Analysis of Eu3+ Emission from Mg2TiO4 Nanoparticles by Judd-Ofelt Theory. in Advances in Condensed Matter Physics.
https://doi.org/10.1155/2015/736517

Vuković K, Medić MM, Sekulić M, Dramićanin M. Analysis of Eu3+ Emission from Mg2TiO4 Nanoparticles by Judd-Ofelt Theory. in Advances in Condensed Matter Physics. 2015;.
doi:10.1155/2015/736517 .

Vuković, Katarina, Medić, Mina M., Sekulić, Milica, Dramićanin, Miroslav, "Analysis of Eu3+ Emission from Mg2TiO4 Nanoparticles by Judd-Ofelt Theory" in Advances in Condensed Matter Physics (2015),
https://doi.org/10.1155/2015/736517 . .