Effect of lithium addition on Te4+ emission in TeO2-Li2O glasses
Nenhuma Miniatura disponível
Data
2019-11-15
Autores
Costa, Francine Bettio [UNESP]
Souza, Ana Kely Rufino
Silva, Junior Reis
Moraes, João Carlos Silos [UNESP]
de Oliveira Nunes, Luiz Antonio
da Cunha Andrade, Luis Humberto
El-Mallawany, Raouf
Lima, Sandro Marcio
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
Lithium tellurite glasses with xTeO2 + (100 − x)Li2O nominal composition, where x = 95, 90, 85, 80, 75 and 70 mol%, have been prepared to investigate the dependence of the Te4+ emission as a function of the lithium modifier. Optical and structural properties of the glasses were explored by using UV–Vis absorption, photoluminescence and photoluminescence excitation spectroscopies, photoluminescence lifetime and Raman spectroscopy. Besides, the influence of Li2O in the glass structure was verified by density, glass transition temperature, thermal stability, glass-forming tendency, optical band edge and the number of non-bridging oxygen. The results support there is a good correlation between the glass structure and the Te4+ center concentration: the Li2O content contributes to increase the Te4+ in the glass structure.
Descrição
Palavras-chave
Lithium as modifier, Photoluminescence, Te4+ centers, Tellurite glasses
Como citar
Journal of Non-Crystalline Solids, v. 524.