Optical properties of Nd3+ and Er3+ ions in TeO2–WO3–PbO–La2O3 glasses

Multicomponent telluride-tungstate glasses containing Nd 3+ and Er 3+ ions were studied experimentally at 77 and 293 K using spectroscopic methods. The Judd–Ofelt intensity parameters were derived from the absorption spectra and used to calculate the radiative lifetimes and branching ratios. The quantum efficiency η = 0.95 of the 4 F 3/2 level of Nd 3+ ion is higher than the typical value of other tellurite-based glasses. For low concentration of Er 3+ ions, the luminescence decay of the 4 S 3/2 and 4 I 11/2 levels is governed by radiative transitions and multiphonon relaxation involving the Te-O highest energy vibrations.