TY  - JOUR
AU  - Srivastava, Alok M.
AU  - Brik, Mikhail G.
AU  - Ma, Chong-Geng
AU  - Beers, William W.
AU  - Cohen, William E.
AU  - Piasecki, Michal
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13190
AB  - The spectroscopic properties of the Mn4+ ion are investigated in the series of isostructural double perovskite compounds, Ba2BTaO6 (B = Y, Lu, Sc). A comparison of these properties highlights the influence of covalent bonding within the perovskite framework and the degree of order between the B3+–Ta cations on the energy and intensity of the Mn4+2E → 4A2 emission transition (R-line). These two parameters of the emission spectrum are of importance for practical application since they determine the phosphor luminous efficacy. The influence of covalent bonding within the corner shared BO6/2 and TaO6/2 perovskite framework on the energy of the R-line energy is investigated. From the spectroscopic data, we have derived information on the influence of the degree of order between the B3+ and Ta5+ cations on the intensity of the R-line. The lowest energy and the highest intensity of the R-line are found in the double perovskite, Ba2ScTaO6. The purpose of this work is to propose for first time an explanation of these effects in the considered double perovskites. The obtained results are useful guidelines for practical improvement and tuning of key parameters of phosphors to the desired values.
T2  - The Journal of Physical Chemistry Letters
T1  - Effect of Covalence and Degree of Cation Order on the Luminous Efficacy of Mn4+ Luminescence in the Double Perovskites, Ba2BTaO6 (B = Y, Lu, Sc)
VL  - 15
SP  - 4175
EP  - 4184
DO  - 10.1021/acs.jpclett.4c00205
ER  - 

@article{
author = "Srivastava, Alok M. and Brik, Mikhail G. and Ma, Chong-Geng and Beers, William W. and Cohen, William E. and Piasecki, Michal",
year = "2024",
abstract = "The spectroscopic properties of the Mn4+ ion are investigated in the series of isostructural double perovskite compounds, Ba2BTaO6 (B = Y, Lu, Sc). A comparison of these properties highlights the influence of covalent bonding within the perovskite framework and the degree of order between the B3+–Ta cations on the energy and intensity of the Mn4+2E → 4A2 emission transition (R-line). These two parameters of the emission spectrum are of importance for practical application since they determine the phosphor luminous efficacy. The influence of covalent bonding within the corner shared BO6/2 and TaO6/2 perovskite framework on the energy of the R-line energy is investigated. From the spectroscopic data, we have derived information on the influence of the degree of order between the B3+ and Ta5+ cations on the intensity of the R-line. The lowest energy and the highest intensity of the R-line are found in the double perovskite, Ba2ScTaO6. The purpose of this work is to propose for first time an explanation of these effects in the considered double perovskites. The obtained results are useful guidelines for practical improvement and tuning of key parameters of phosphors to the desired values.",
journal = "The Journal of Physical Chemistry Letters",
title = "Effect of Covalence and Degree of Cation Order on the Luminous Efficacy of Mn4+ Luminescence in the Double Perovskites, Ba2BTaO6 (B = Y, Lu, Sc)",
volume = "15",
pages = "4175-4184",
doi = "10.1021/acs.jpclett.4c00205"
}

Srivastava, A. M., Brik, M. G., Ma, C., Beers, W. W., Cohen, W. E.,& Piasecki, M.. (2024). Effect of Covalence and Degree of Cation Order on the Luminous Efficacy of Mn4+ Luminescence in the Double Perovskites, Ba2BTaO6 (B = Y, Lu, Sc). in The Journal of Physical Chemistry Letters, 15, 4175-4184.
https://doi.org/10.1021/acs.jpclett.4c00205

Srivastava AM, Brik MG, Ma C, Beers WW, Cohen WE, Piasecki M. Effect of Covalence and Degree of Cation Order on the Luminous Efficacy of Mn4+ Luminescence in the Double Perovskites, Ba2BTaO6 (B = Y, Lu, Sc). in The Journal of Physical Chemistry Letters. 2024;15:4175-4184.
doi:10.1021/acs.jpclett.4c00205 .

Srivastava, Alok M., Brik, Mikhail G., Ma, Chong-Geng, Beers, William W., Cohen, William E., Piasecki, Michal, "Effect of Covalence and Degree of Cation Order on the Luminous Efficacy of Mn4+ Luminescence in the Double Perovskites, Ba2BTaO6 (B = Y, Lu, Sc)" in The Journal of Physical Chemistry Letters, 15 (2024):4175-4184,
https://doi.org/10.1021/acs.jpclett.4c00205 . .

TY  - JOUR
AU  - Buryi, Maksym
AU  - Babin, Vladimir
AU  - Děcká, Kateřina
AU  - Ridzoňová, Katarína
AU  - Neykova, Neda
AU  - Hájek, František
AU  - Velkov, Zhivko
AU  - Remeš, Zdeněk
AU  - Tomala, Robert
AU  - Socha, Paweł
AU  - Bartosiewicz, Karol
AU  - Hostinský, Tomáš
AU  - Mošner, Petr
AU  - Yamamoto, Tomoyuki
AU  - Ma, Chong-Geng
AU  - Brik, Mikhail G.
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/13180
AB  - Cesium lead bromide (CsPbBr3, CPB) powder formed by micro-, nanocrystals (MC, NC) and quantum dots (QD) was synthesized as free-standing and polystyrene covered. Luminescence was multicomponent, in general, ranging from below 1.9 eV up to about 2.6 eV. The ultrafast decay kinetics exhibited strong decay time component with the value of 260 ps. Electron paramagnetic resonance (EPR) revealed surface defects like O2 and some spin transitions most likely originating from some complex defect, supposedly F-Vk(H) dimer center under the constant ultraviolet (UV) light irradiation at the temperature T =10 K. The thermal release of the electrons from the O2 center was correlated with the 117 K thermally stimulated luminescence (TSL) peak. Coating with polystyrene resulted in the about doubly increased decay time of luminescence. The O2 and F-Vk(H) EPR resonances were not observed as well. The TSL peak which might be ascribed to the O2 was not clearly detected anymore. The glow curve was composed of one very broad peak typical for the amorphous materials. At the same time, the polystyrene prevented the MCs creation. The existence of charge/energy transfer between the CPB and polystyrene due to the chemical bonding was assumed and confirmed also by calculations.
T2  - Optical Materials
T1  - Charge trapping and luminescence of the mixed size CsPbBr3 particles grown in one batch
VL  - 151
SP  - 115279
DO  - 10.1016/j.optmat.2024.115279
ER  - 

@article{
author = "Buryi, Maksym and Babin, Vladimir and Děcká, Kateřina and Ridzoňová, Katarína and Neykova, Neda and Hájek, František and Velkov, Zhivko and Remeš, Zdeněk and Tomala, Robert and Socha, Paweł and Bartosiewicz, Karol and Hostinský, Tomáš and Mošner, Petr and Yamamoto, Tomoyuki and Ma, Chong-Geng and Brik, Mikhail G.",
year = "2024",
abstract = "Cesium lead bromide (CsPbBr3, CPB) powder formed by micro-, nanocrystals (MC, NC) and quantum dots (QD) was synthesized as free-standing and polystyrene covered. Luminescence was multicomponent, in general, ranging from below 1.9 eV up to about 2.6 eV. The ultrafast decay kinetics exhibited strong decay time component with the value of 260 ps. Electron paramagnetic resonance (EPR) revealed surface defects like O2 and some spin transitions most likely originating from some complex defect, supposedly F-Vk(H) dimer center under the constant ultraviolet (UV) light irradiation at the temperature T =10 K. The thermal release of the electrons from the O2 center was correlated with the 117 K thermally stimulated luminescence (TSL) peak. Coating with polystyrene resulted in the about doubly increased decay time of luminescence. The O2 and F-Vk(H) EPR resonances were not observed as well. The TSL peak which might be ascribed to the O2 was not clearly detected anymore. The glow curve was composed of one very broad peak typical for the amorphous materials. At the same time, the polystyrene prevented the MCs creation. The existence of charge/energy transfer between the CPB and polystyrene due to the chemical bonding was assumed and confirmed also by calculations.",
journal = "Optical Materials",
title = "Charge trapping and luminescence of the mixed size CsPbBr3 particles grown in one batch",
volume = "151",
pages = "115279",
doi = "10.1016/j.optmat.2024.115279"
}

Buryi, M., Babin, V., Děcká, K., Ridzoňová, K., Neykova, N., Hájek, F., Velkov, Z., Remeš, Z., Tomala, R., Socha, P., Bartosiewicz, K., Hostinský, T., Mošner, P., Yamamoto, T., Ma, C.,& Brik, M. G.. (2024). Charge trapping and luminescence of the mixed size CsPbBr3 particles grown in one batch. in Optical Materials, 151, 115279.
https://doi.org/10.1016/j.optmat.2024.115279

Buryi M, Babin V, Děcká K, Ridzoňová K, Neykova N, Hájek F, Velkov Z, Remeš Z, Tomala R, Socha P, Bartosiewicz K, Hostinský T, Mošner P, Yamamoto T, Ma C, Brik MG. Charge trapping and luminescence of the mixed size CsPbBr3 particles grown in one batch. in Optical Materials. 2024;151:115279.
doi:10.1016/j.optmat.2024.115279 .

Buryi, Maksym, Babin, Vladimir, Děcká, Kateřina, Ridzoňová, Katarína, Neykova, Neda, Hájek, František, Velkov, Zhivko, Remeš, Zdeněk, Tomala, Robert, Socha, Paweł, Bartosiewicz, Karol, Hostinský, Tomáš, Mošner, Petr, Yamamoto, Tomoyuki, Ma, Chong-Geng, Brik, Mikhail G., "Charge trapping and luminescence of the mixed size CsPbBr3 particles grown in one batch" in Optical Materials, 151 (2024):115279,
https://doi.org/10.1016/j.optmat.2024.115279 . .