TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Periša, Jovana
AU  - Medić, Mina M.
AU  - Kuzman, Sanja
AU  - Ristić, Zoran
AU  - Antić, Željka
AU  - Dramićanin, Miroslav
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9907
AB  - The luminescence thermometry based on the intensity ratio of Cr3+ and host emissions in the Cr3+ activated MgTiO3 phosphor powder is demonstrated over the 100–350 K temperature range. Phosphor was prepared by a two-step procedure based on the sol-gel and molten salt methods. Rhombohedral crystal structure of the material is confirmed by X-ray diffraction analysis, and the mean crystallite size of the powder was calculated to be ~ 32 nm. Morphology was investigated using scanning electron microscopy showing ellipsoidal, densely packed grains with 100 nm–150 nm average size. Photoluminescence emission spectra recorded under 385 nm excitation showed the broad host emission centered at ~ 485 nm and the Cr3+ emission around ~ 700 nm. The temperature-dependent emission spectra showed that host-emission intensity is almost temperature invariant, while the intensity of the Cr3+ emission rapidly decreases from 200 K to 350 K. Such behavior theoretically modelled and further applied for the ratiometric luminescence temperature sensing showed the maximal relative sensitivity of ~ 2.6% K-1, temperature resolution of 0.3 K, and excellent repeatability.
T2  - Ceramics International
T1  - Sensitive temperature reading from intensity ratio of Cr3+ and defects’ emissions in MgTiO3:Cr3+
VL  - 47
IS  - 22
SP  - 31915
EP  - 31919
DO  - 10.1016/j.ceramint.2021.08.077
ER  - 

@article{
author = "Ćirić, Aleksandar and Periša, Jovana and Medić, Mina M. and Kuzman, Sanja and Ristić, Zoran and Antić, Željka and Dramićanin, Miroslav",
year = "2021",
abstract = "The luminescence thermometry based on the intensity ratio of Cr3+ and host emissions in the Cr3+ activated MgTiO3 phosphor powder is demonstrated over the 100–350 K temperature range. Phosphor was prepared by a two-step procedure based on the sol-gel and molten salt methods. Rhombohedral crystal structure of the material is confirmed by X-ray diffraction analysis, and the mean crystallite size of the powder was calculated to be ~ 32 nm. Morphology was investigated using scanning electron microscopy showing ellipsoidal, densely packed grains with 100 nm–150 nm average size. Photoluminescence emission spectra recorded under 385 nm excitation showed the broad host emission centered at ~ 485 nm and the Cr3+ emission around ~ 700 nm. The temperature-dependent emission spectra showed that host-emission intensity is almost temperature invariant, while the intensity of the Cr3+ emission rapidly decreases from 200 K to 350 K. Such behavior theoretically modelled and further applied for the ratiometric luminescence temperature sensing showed the maximal relative sensitivity of ~ 2.6% K-1, temperature resolution of 0.3 K, and excellent repeatability.",
journal = "Ceramics International",
title = "Sensitive temperature reading from intensity ratio of Cr3+ and defects’ emissions in MgTiO3:Cr3+",
volume = "47",
number = "22",
pages = "31915-31919",
doi = "10.1016/j.ceramint.2021.08.077"
}

Ćirić, A., Periša, J., Medić, M. M., Kuzman, S., Ristić, Z., Antić, Ž.,& Dramićanin, M.. (2021). Sensitive temperature reading from intensity ratio of Cr3+ and defects’ emissions in MgTiO3:Cr3+. in Ceramics International, 47(22), 31915-31919.
https://doi.org/10.1016/j.ceramint.2021.08.077

Ćirić A, Periša J, Medić MM, Kuzman S, Ristić Z, Antić Ž, Dramićanin M. Sensitive temperature reading from intensity ratio of Cr3+ and defects’ emissions in MgTiO3:Cr3+. in Ceramics International. 2021;47(22):31915-31919.
doi:10.1016/j.ceramint.2021.08.077 .

Ćirić, Aleksandar, Periša, Jovana, Medić, Mina M., Kuzman, Sanja, Ristić, Zoran, Antić, Željka, Dramićanin, Miroslav, "Sensitive temperature reading from intensity ratio of Cr3+ and defects’ emissions in MgTiO3:Cr3+" in Ceramics International, 47, no. 22 (2021):31915-31919,
https://doi.org/10.1016/j.ceramint.2021.08.077 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Sekulić, Milica
AU  - Shah, Kevil
AU  - Chakrabarty, Bishwajit S.
AU  - Dramićanin, Miroslav
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9885
AB  - Upconversion sub-micron particles are one of the most perspective materials due to their wide application range, the most important being in the bio-medicinal field where they can be used for labeling, sensing, treatment or drug delivery. Chemically stable upconversion sub-micron particles of La2O2S co-doped with Yb3+/Ho3+ and Yb3+/Tm3+ were synthesized and characterized. Different concentrations of Yb3+/Ho3+ and Yb3+/Tm3+ were successfully incorporated into the hexagonal crystal structure of lanthanum oxysulfide using the optimized solution combustion synthesis method with urea as a fuel. Sub-micron particles of less than 50 nm in diameter showed the typical upconversion photoluminescence when exited by 980 nm laser. The highest PL intensities were obtained in La2O2S co-doped with 8 wt% Yb and 1.5 wt% Ho, or in case of La2O2S:Yb3+/Tm3+ with 4 wt% Yb and 0.5 wt% Tm. The CIE 1976 chromaticity coordinates of Ho3+ photoluminescence emission are (0.119, 0.581), with color purity of 98.7 %. The chromaticity of upconversion emission was invariant to doping concentrations.
T2  - Optical Materials
T1  - Upconversion photoluminescence of sub-micron lanthanum oxysulfide particles co-doped with Yb3+/Ho3+ and Yb3+/Tm3+ synthesized by optimized combustion technique
VL  - 120
SP  - 111417
DO  - 10.1016/j.optmat.2021.111417
ER  - 

@article{
author = "Ćirić, Aleksandar and Sekulić, Milica and Shah, Kevil and Chakrabarty, Bishwajit S. and Dramićanin, Miroslav",
year = "2021",
abstract = "Upconversion sub-micron particles are one of the most perspective materials due to their wide application range, the most important being in the bio-medicinal field where they can be used for labeling, sensing, treatment or drug delivery. Chemically stable upconversion sub-micron particles of La2O2S co-doped with Yb3+/Ho3+ and Yb3+/Tm3+ were synthesized and characterized. Different concentrations of Yb3+/Ho3+ and Yb3+/Tm3+ were successfully incorporated into the hexagonal crystal structure of lanthanum oxysulfide using the optimized solution combustion synthesis method with urea as a fuel. Sub-micron particles of less than 50 nm in diameter showed the typical upconversion photoluminescence when exited by 980 nm laser. The highest PL intensities were obtained in La2O2S co-doped with 8 wt% Yb and 1.5 wt% Ho, or in case of La2O2S:Yb3+/Tm3+ with 4 wt% Yb and 0.5 wt% Tm. The CIE 1976 chromaticity coordinates of Ho3+ photoluminescence emission are (0.119, 0.581), with color purity of 98.7 %. The chromaticity of upconversion emission was invariant to doping concentrations.",
journal = "Optical Materials",
title = "Upconversion photoluminescence of sub-micron lanthanum oxysulfide particles co-doped with Yb3+/Ho3+ and Yb3+/Tm3+ synthesized by optimized combustion technique",
volume = "120",
pages = "111417",
doi = "10.1016/j.optmat.2021.111417"
}

Ćirić, A., Sekulić, M., Shah, K., Chakrabarty, B. S.,& Dramićanin, M.. (2021). Upconversion photoluminescence of sub-micron lanthanum oxysulfide particles co-doped with Yb3+/Ho3+ and Yb3+/Tm3+ synthesized by optimized combustion technique. in Optical Materials, 120, 111417.
https://doi.org/10.1016/j.optmat.2021.111417

Ćirić A, Sekulić M, Shah K, Chakrabarty BS, Dramićanin M. Upconversion photoluminescence of sub-micron lanthanum oxysulfide particles co-doped with Yb3+/Ho3+ and Yb3+/Tm3+ synthesized by optimized combustion technique. in Optical Materials. 2021;120:111417.
doi:10.1016/j.optmat.2021.111417 .

Ćirić, Aleksandar, Sekulić, Milica, Shah, Kevil, Chakrabarty, Bishwajit S., Dramićanin, Miroslav, "Upconversion photoluminescence of sub-micron lanthanum oxysulfide particles co-doped with Yb3+/Ho3+ and Yb3+/Tm3+ synthesized by optimized combustion technique" in Optical Materials, 120 (2021):111417,
https://doi.org/10.1016/j.optmat.2021.111417 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Shah, Kevil
AU  - Sekulić, Milica
AU  - Chakrabarty, Bishwajit S.
AU  - Dramićanin, Miroslav
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9884
AB  - Nanoparticles of less than 100 nm of La2O2S co-doped with Er3+ and Yb3+ in 2% and 12% concentrations, respectively, were synthesized by the improved furnace combustion technique that limits the precursor usage and without the hazardous chemicals. The lanthanum oxysulfide was identified in hexagonal crystal phase. Under 980 nm excitation the sample exhibits a typical upconversion photoluminescence for Yb3+/Er3+. Due to the high concentration of Yb3+, the red emission of Er3+ is of high intensity due to the energy back-transfer. The red emission is less pronounced in downshifting spectrum. Chromaticity analysis shows high color purities of emissions. La2O2S:Er3+/Yb3+ nanoparticle performances as a luminescent temperature sensor were first predicted by the Judd-Ofelt theory and then compared with the conventional experimental thermometry by Luminescence intensity ratio method, with an excellent match in all parameters. The relative sensitivity at 300 K is 1.14 K−1 and it remains relatively high at the physiologically relevant range. The obtained temperature resolution was 0.17 K at 300 K.
T2  - Optik
T1  - La2O2S:Er3+/Yb3+ nanoparticles synthesized by the optimized furnace combustion technique and their high-resolution temperature sensing
VL  - 245
SP  - 167690
DO  - 10.1016/j.ijleo.2021.167690
ER  - 

@article{
author = "Ćirić, Aleksandar and Shah, Kevil and Sekulić, Milica and Chakrabarty, Bishwajit S. and Dramićanin, Miroslav",
year = "2021",
abstract = "Nanoparticles of less than 100 nm of La2O2S co-doped with Er3+ and Yb3+ in 2% and 12% concentrations, respectively, were synthesized by the improved furnace combustion technique that limits the precursor usage and without the hazardous chemicals. The lanthanum oxysulfide was identified in hexagonal crystal phase. Under 980 nm excitation the sample exhibits a typical upconversion photoluminescence for Yb3+/Er3+. Due to the high concentration of Yb3+, the red emission of Er3+ is of high intensity due to the energy back-transfer. The red emission is less pronounced in downshifting spectrum. Chromaticity analysis shows high color purities of emissions. La2O2S:Er3+/Yb3+ nanoparticle performances as a luminescent temperature sensor were first predicted by the Judd-Ofelt theory and then compared with the conventional experimental thermometry by Luminescence intensity ratio method, with an excellent match in all parameters. The relative sensitivity at 300 K is 1.14 K−1 and it remains relatively high at the physiologically relevant range. The obtained temperature resolution was 0.17 K at 300 K.",
journal = "Optik",
title = "La2O2S:Er3+/Yb3+ nanoparticles synthesized by the optimized furnace combustion technique and their high-resolution temperature sensing",
volume = "245",
pages = "167690",
doi = "10.1016/j.ijleo.2021.167690"
}

Ćirić, A., Shah, K., Sekulić, M., Chakrabarty, B. S.,& Dramićanin, M.. (2021). La2O2S:Er3+/Yb3+ nanoparticles synthesized by the optimized furnace combustion technique and their high-resolution temperature sensing. in Optik, 245, 167690.
https://doi.org/10.1016/j.ijleo.2021.167690

Ćirić A, Shah K, Sekulić M, Chakrabarty BS, Dramićanin M. La2O2S:Er3+/Yb3+ nanoparticles synthesized by the optimized furnace combustion technique and their high-resolution temperature sensing. in Optik. 2021;245:167690.
doi:10.1016/j.ijleo.2021.167690 .

Ćirić, Aleksandar, Shah, Kevil, Sekulić, Milica, Chakrabarty, Bishwajit S., Dramićanin, Miroslav, "La2O2S:Er3+/Yb3+ nanoparticles synthesized by the optimized furnace combustion technique and their high-resolution temperature sensing" in Optik, 245 (2021):167690,
https://doi.org/10.1016/j.ijleo.2021.167690 . .

TY  - JOUR
AU  - Ćirić, Aleksandar
AU  - Ristić, Zoran
AU  - Barudžija, Tanja
AU  - Srivastava, Alok
AU  - Dramićanin, Miroslav
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9848
AB  - Judd–Ofelt (JO) theory explains the optical properties of trivalent lanthanides using only three intensity parameters. The JO parametrization is a complicated procedure of absorption spectra analysis, especially cumbersome for powders and non-transparent materials. For the Pr3+ activated materials, the procedure is additionally complicated due to strong interaction of low-lying Pr3+ 4f5d energy levels with the 4f levels. Here, the straightforward JO parametrization method that uses the emission spectrum and the excited state lifetime of the Pr3+ 3P0 level which does not require any fitting procedure are shown. In addition, the theory and software for calculations of JO parameters from Pr3+ emission are explained. The method requirements are low-temperature photoluminescence measurements of Pr3+ introduced in low phonon energy hosts with a relatively high lying 4f5d energy level. The method is demonstrated on emissions of YF3:Pr3+ and LaF3:Pr3+ powders.
T2  - Advanced Theory and Simulations
T1  - Judd–Ofelt Parametrization from the Emission Spectrum of Pr3+ Doped Materials: Theory, Application Software, and Demonstration on Pr3+ Doped YF3 and LaF3
VL  - 4
IS  - 6
SP  - 2100082
DO  - 10.1002/adts.202100082
ER  - 

@article{
author = "Ćirić, Aleksandar and Ristić, Zoran and Barudžija, Tanja and Srivastava, Alok and Dramićanin, Miroslav",
year = "2021",
abstract = "Judd–Ofelt (JO) theory explains the optical properties of trivalent lanthanides using only three intensity parameters. The JO parametrization is a complicated procedure of absorption spectra analysis, especially cumbersome for powders and non-transparent materials. For the Pr3+ activated materials, the procedure is additionally complicated due to strong interaction of low-lying Pr3+ 4f5d energy levels with the 4f levels. Here, the straightforward JO parametrization method that uses the emission spectrum and the excited state lifetime of the Pr3+ 3P0 level which does not require any fitting procedure are shown. In addition, the theory and software for calculations of JO parameters from Pr3+ emission are explained. The method requirements are low-temperature photoluminescence measurements of Pr3+ introduced in low phonon energy hosts with a relatively high lying 4f5d energy level. The method is demonstrated on emissions of YF3:Pr3+ and LaF3:Pr3+ powders.",
journal = "Advanced Theory and Simulations",
title = "Judd–Ofelt Parametrization from the Emission Spectrum of Pr3+ Doped Materials: Theory, Application Software, and Demonstration on Pr3+ Doped YF3 and LaF3",
volume = "4",
number = "6",
pages = "2100082",
doi = "10.1002/adts.202100082"
}

Ćirić, A., Ristić, Z., Barudžija, T., Srivastava, A.,& Dramićanin, M.. (2021). Judd–Ofelt Parametrization from the Emission Spectrum of Pr3+ Doped Materials: Theory, Application Software, and Demonstration on Pr3+ Doped YF3 and LaF3. in Advanced Theory and Simulations, 4(6), 2100082.
https://doi.org/10.1002/adts.202100082

Ćirić A, Ristić Z, Barudžija T, Srivastava A, Dramićanin M. Judd–Ofelt Parametrization from the Emission Spectrum of Pr3+ Doped Materials: Theory, Application Software, and Demonstration on Pr3+ Doped YF3 and LaF3. in Advanced Theory and Simulations. 2021;4(6):2100082.
doi:10.1002/adts.202100082 .

Ćirić, Aleksandar, Ristić, Zoran, Barudžija, Tanja, Srivastava, Alok, Dramićanin, Miroslav, "Judd–Ofelt Parametrization from the Emission Spectrum of Pr3+ Doped Materials: Theory, Application Software, and Demonstration on Pr3+ Doped YF3 and LaF3" in Advanced Theory and Simulations, 4, no. 6 (2021):2100082,
https://doi.org/10.1002/adts.202100082 . .