Judd Ofelt Analysis and Optical Properties of Rare Earth Doped Tellurite Glasses

Abstract

In this work, the structural characteristic and photoluminescence properties were investigated in Eu$^{3 + }$ ions-doped B$_{2}$O$_{3}$-TeO$_{2}$ --ZnO-Na$_{2}$O glasses. These glasses were prepared by the melting method in air, after that thermal annealed 350\rc{}C, 450\rc{}C and 550\rc{}C for different times. The analysis results of structure on these glasses showed the formation of micro-crystals in host glass after thermal annealed process. The photoluminescence spectra of Eu$^{3 + }$ ions in these samples were observed. The local vibration mode around Eu$^{3 + }$ ions was investigated by the phonon side band associated with $^{7}$F$_{0}$- $^{5}$D$_{2}$ transition of Eu$^{3 + }$. Judd-Ofelt parameters have been evaluated from photoluminescence spectra and were to predict the luminescence intensity ratios of $^{5}$D$_{0} \to ^{7}$F$_{J}$ (J=2, 4 and 6) to $^{5}$D$_{0} \to ^{7}$F$_{1}$ transition. The obtained results have been used for calculating $\Omega_{2}$, $\Omega _{4}$, $\Omega _{6}$ parameters by using Judd-Ofelt theory. These $\Omega _{2}$, $\Omega _{4}$, $\Omega _{6}$ parameters allow to derive radiative properties of Eu$^{3 + }$ ions in glass material such as transition probabilities, radiative lifetimes and peak stimulated emission cross-section for the $^{5}$D$_{0} \to ^{7}$F$_{J}$ transitions.