Influence of cationic field strength of modifiers on the 1.53 μm spectroscopic properties of Er3+-doped tellurite glasses

Two series of Er3+-doped tellurite glasses with different glass modifiers were prepared by the conventional melt-quenching method. In order to estimate the effect of cationic field strength z/a2 of modifiers on the fluorescence properties, the fluorescence spectra were measured. The strength parameters Ωt (t = 2, 4, 6) for all the samples were calculated based on the absorption spectra and also compared between them. The values of Ω6 decrease with decreasing of the cationic field strength z/a2 of modifiers. As the cationic field strength decrease, the polarization effect of the ligand fields around Er3+ increase in the glasses, and which leads to the decreasing of fluorescence peak intensity and bandwidth. The strength of interactions between Er3+ ions and OH− groups, kOH–Er, depend on the glass composition, are changed with glass modifiers.