Judd Ofelt Analysis and Optical Properties of Eu$^{3 + }$ Doped Tellurite Glasses

Abstract

In this work, the structural characteristic and photoluminescence properties of Eu$^{3 + }$ doped B$_{2}$O$_{3}$-TeO$_{2}$ -ZnO-Na$_{2}$O glasses were investigated. These glasses were prepared by a melting method in air, combined with thermal annealing at 350$^{\circ}$C, 450$^{\circ}$C and 550$^{\circ}$C for different duration times. The structural analysis results of these glasses revealed the formation of micro-crystals in the annealed host glass. The photoluminescence spectra of Eu$^{3 + }$ doped in these samples were observed. The local vibration mode around Eu$^{3 + }$ ions was investigated by the phonon side-band (PSB) associated with $^{7}\!F_{0}-^{5}D_{2}$ transition of Eu$^{3+}$. Judd-Ofelt parameters were then evaluated based on photoluminescence spectra and 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 were predicted. The obtained results were then used to calculate $\Omega _{2},\;\Omega _{4},\; \Omega _{6}$ parameters based on 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.