Studies on the influence of structure units on the state of ytterbium ions in TeO2-based glasses

A simple composition of TeO 2 –Yb 2 O 3 binary glass was selected as the host glass matrix for discussing the structure of tellurite glass with increasing Yb 2 O 3 content. Raman spectra were measured to investigate the structure of the binary tellurite glasses, and upconversion and downconversion fluorescence characteristics were employed for discussing the relationship between the structural units and the state of Yb 3+ in the tellurite glasses. The results suggested that the decrease of TeO 4/2 in the glasses would result in the formation of Yb 3+ clusters and Yb 3+ –O 2− couple in the tellurite glasses, and then results in the decrease of cooperative upconversion and downconversion fluorescence intensity.