Spectroscopic investigations on Eu3+ ions in Li-K-Zn fluorotellurite glasses

Eu3+ ions incorporated Li-K-Zn fluorotellurite glasses, (70 - x)TeO2 + 10Li(2)O + 10K(2)O + 10ZnF(2) + xEu(2)O(3), (0 <= x <= 2 mol%) were prepared via melt quenching technique. Optical absorption from F-7(0) and F-7(1) levels of the Eu3+-doped glass has been studied to examine the covalent bonding characteristics, energy band gap and Judd-Ofelt intensity parameters. The emission spectra (D-5(0) -> F-7(0,1,2.3,4)) of theglasses were used to estimate the luminescence enhancement, asymmetric environment in the vicinity of Eu3+ ions, stimulated emission cross section and branching ratios. The phonon side band mechanism of D-5(2) level of the Eu3+ ions in the prepared glass was examined by considering the excitation and Raman spectra. The radiative lifetime calculated using Judd-Ofelt parameters was compared with the experimental lifetime to estimate the quantum efficiency of D-5(0) level of Eu3+ ions in Li-K-Zn fluorotellurite glass. (C) 2014 Elsevier B.V. All rights reserved.