TY  - JOUR
AU  - Prashanthi, Kovur
AU  - Antić, Željka
AU  - Thakur, Garima
AU  - Dramićanin, Miroslav
AU  - Thundat, Thomas
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1912
AB  - Wide-bandgap semiconductor nanowires with surface defect emission centers have the potential to be used as sensitive thermometers and optical probes. Here, we show that the green luminescence of multiferroic BiFeO3 (BFO) nanowires shows an anomalous negative thermal quenching (NTQ) with increasing temperatures. The release of trapped carriers from localized surface defect states is suggested as the possible mechanism for the increased green luminescence which was experimentally observed at elevated temperatures. A reasonable interpretation of the photoluminescence (PL) processes in BFO nanowires is achieved, and the activation energies of the PL quenching and thermal hopping are deduced. Negative thermal quenching of BFO nanowires provides a new strategy for optical thermometry at higher temperatures.
T2  - Physica Status Solidi - Rapid Research Letters
T1  - Surface State-Induced Anomalous Negative Thermal Quenching of Multiferroic BiFeO3 Nanowires
VL  - 12
IS  - 1
DO  - 10.1002/pssr.201700352
ER  - 

@article{
author = "Prashanthi, Kovur and Antić, Željka and Thakur, Garima and Dramićanin, Miroslav and Thundat, Thomas",
year = "2018",
abstract = "Wide-bandgap semiconductor nanowires with surface defect emission centers have the potential to be used as sensitive thermometers and optical probes. Here, we show that the green luminescence of multiferroic BiFeO3 (BFO) nanowires shows an anomalous negative thermal quenching (NTQ) with increasing temperatures. The release of trapped carriers from localized surface defect states is suggested as the possible mechanism for the increased green luminescence which was experimentally observed at elevated temperatures. A reasonable interpretation of the photoluminescence (PL) processes in BFO nanowires is achieved, and the activation energies of the PL quenching and thermal hopping are deduced. Negative thermal quenching of BFO nanowires provides a new strategy for optical thermometry at higher temperatures.",
journal = "Physica Status Solidi - Rapid Research Letters",
title = "Surface State-Induced Anomalous Negative Thermal Quenching of Multiferroic BiFeO3 Nanowires",
volume = "12",
number = "1",
doi = "10.1002/pssr.201700352"
}

Prashanthi, K., Antić, Ž., Thakur, G., Dramićanin, M.,& Thundat, T.. (2018). Surface State-Induced Anomalous Negative Thermal Quenching of Multiferroic BiFeO3 Nanowires. in Physica Status Solidi - Rapid Research Letters, 12(1).
https://doi.org/10.1002/pssr.201700352

Prashanthi K, Antić Ž, Thakur G, Dramićanin M, Thundat T. Surface State-Induced Anomalous Negative Thermal Quenching of Multiferroic BiFeO3 Nanowires. in Physica Status Solidi - Rapid Research Letters. 2018;12(1).
doi:10.1002/pssr.201700352 .

Prashanthi, Kovur, Antić, Željka, Thakur, Garima, Dramićanin, Miroslav, Thundat, Thomas, "Surface State-Induced Anomalous Negative Thermal Quenching of Multiferroic BiFeO3 Nanowires" in Physica Status Solidi - Rapid Research Letters, 12, no. 1 (2018),
https://doi.org/10.1002/pssr.201700352 . .

TY  - JOUR
AU  - Antić, Željka
AU  - Đorđević, Vesna R.
AU  - Dramićanin, Miroslav
AU  - Thundat, Thomas
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/914
AB  - Europium (III)-doped (YxSc1-x)(2)O-3 nanocrystalline powders of different compositions (x=0, 0.25, 0.5, 0.75 and 1) are synthesized using a polymer complex solution method. Comparative structural and optical characterization is carried out with powder X-ray diffraction and photoluminescence excitation, emission and emission decay measurements. Detailed information about unit cell parameter and energy levels of europium (III) ions are presented for all powder compositions. The second rank crystal field parameters (B-0(2)) and (B-2(2)) and crystal field strength (N-v) are calculated from the energies of Stark components of the F-7(1) manifold of the europium (III) emissions. It has been shown that the crystal field parameter changes with the powder composition and shows a linear relationship with the average ionic radii of cations in the solid solutions. A similar dependence is also found for the magnitude of splitting of F-7(1) manifold vs. unit cell parameter values. Moreover, this linear relationship is demonstrated for the whole family of europium (III)-doped mixed rare-earth sesquioxide hosts (RRO-3; R, R=rare earth ions) by taking into consideration results published in the literature so far. A simple, semi-empirical equation which relates structural properties (unit cell parameters, ionic radii) of the sesquioxide host material and the emission properties of europium (III) ions (energy splitting of the F-7(1) manifold, crystal field parameters and crystal field strength) are presented. Crown Copyright (C) 2015 Published by Elsevier Ltd and Techna Group S.r.l. All rights reserved.
PB  - Elsevier
T2  - Ceramics International
T1  - Photoluminescence of europium(III)-doped (YxSc1-x)(2)O-3 nanoparticles: Linear relationship between structural and emission properties
VL  - 42
IS  - 3
SP  - 3899
EP  - 3906
DO  - 10.1016/j.ceramint.2015.11.056
ER  - 

@article{
author = "Antić, Željka and Đorđević, Vesna R. and Dramićanin, Miroslav and Thundat, Thomas",
year = "2016",
abstract = "Europium (III)-doped (YxSc1-x)(2)O-3 nanocrystalline powders of different compositions (x=0, 0.25, 0.5, 0.75 and 1) are synthesized using a polymer complex solution method. Comparative structural and optical characterization is carried out with powder X-ray diffraction and photoluminescence excitation, emission and emission decay measurements. Detailed information about unit cell parameter and energy levels of europium (III) ions are presented for all powder compositions. The second rank crystal field parameters (B-0(2)) and (B-2(2)) and crystal field strength (N-v) are calculated from the energies of Stark components of the F-7(1) manifold of the europium (III) emissions. It has been shown that the crystal field parameter changes with the powder composition and shows a linear relationship with the average ionic radii of cations in the solid solutions. A similar dependence is also found for the magnitude of splitting of F-7(1) manifold vs. unit cell parameter values. Moreover, this linear relationship is demonstrated for the whole family of europium (III)-doped mixed rare-earth sesquioxide hosts (RRO-3; R, R=rare earth ions) by taking into consideration results published in the literature so far. A simple, semi-empirical equation which relates structural properties (unit cell parameters, ionic radii) of the sesquioxide host material and the emission properties of europium (III) ions (energy splitting of the F-7(1) manifold, crystal field parameters and crystal field strength) are presented. Crown Copyright (C) 2015 Published by Elsevier Ltd and Techna Group S.r.l. All rights reserved.",
publisher = "Elsevier",
journal = "Ceramics International",
title = "Photoluminescence of europium(III)-doped (YxSc1-x)(2)O-3 nanoparticles: Linear relationship between structural and emission properties",
volume = "42",
number = "3",
pages = "3899-3906",
doi = "10.1016/j.ceramint.2015.11.056"
}

Antić, Ž., Đorđević, V. R., Dramićanin, M.,& Thundat, T.. (2016). Photoluminescence of europium(III)-doped (YxSc1-x)(2)O-3 nanoparticles: Linear relationship between structural and emission properties. in Ceramics International
Elsevier., 42(3), 3899-3906.
https://doi.org/10.1016/j.ceramint.2015.11.056

Antić Ž, Đorđević VR, Dramićanin M, Thundat T. Photoluminescence of europium(III)-doped (YxSc1-x)(2)O-3 nanoparticles: Linear relationship between structural and emission properties. in Ceramics International. 2016;42(3):3899-3906.
doi:10.1016/j.ceramint.2015.11.056 .

Antić, Željka, Đorđević, Vesna R., Dramićanin, Miroslav, Thundat, Thomas, "Photoluminescence of europium(III)-doped (YxSc1-x)(2)O-3 nanoparticles: Linear relationship between structural and emission properties" in Ceramics International, 42, no. 3 (2016):3899-3906,
https://doi.org/10.1016/j.ceramint.2015.11.056 . .