Correlated EPR and optical study of charge trapping phenomena in tellurite glasses. The role of barium oxide

0576494 - ÚJF 2024 RIV NL eng J - Journal Article
Hrabovský, J. - Buryi, M. - Babin, V. - Ridzonova, K. - Paurová, K. - John, David
Correlated EPR and optical study of charge trapping phenomena in tellurite glasses. The role of barium oxide.
Journal of Non-Crystalline Solids. Roč. 620, NOV (2023), č. článku 122596. ISSN 0022-3093. E-ISSN 1873-4812
Institutional support: RVO:61389005
Keywords : TeO2-ZnO-BaO * Electron paramagnetic resonance * Photoluminescence * Radioluminescence * Thermoluminescence * Charge-trapping centers
OECD category: Materials engineering
Impact factor: 3.5, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.jnoncrysol.2023.122596

Tellurite glasses of the compositions TeO2(60%)-ZnO(40%) and TeO2(60%)-ZnO(20%)-BaO(20%) were prepared in the bulk form with following grinding into powders. The samples were X-ray irradiated. The created charge trapping centers were studied in both types of samples using electron paramagnetic resonance (EPR) spectroscopy. The O- defect and two types of F+ centers were discovered. One of the F+ center remained unchanged whereas the other one as well as the O- defect were affected by the presence of BaO. Moreover, photo-, radioand thermoluminescence (PL, RL, TL, respectively) methods were applied as well. The discovered charge trapping centers have been proven to influence luminescence properties as well - improving them in the TeO2(60%)ZnO(40%) and vice versa degrading them in the TeO2(60%)-ZnO(20%)-BaO(20%) glasses. The effect was even stronger in the grinded samples as compared to the bulk ones. The role of the BaO has been disclosed as supporting oxygen leakage from the host.
Permanent Link: https://hdl.handle.net/11104/0346049