Concentration dependent luminescence properties of Sm3+-ions in tellurite-tungsten-zirconium glasses

Tellutite glasses doped with Sm3+ ions with composition of TeO2 + WO3 + ZrO2 + Sm2O3 (TWZSm) have been prepared by conventional melt-quenching technique and investigated their vibrational, optical and luminescence properties through Raman, absorption, emission and decay analysis. The amorphous nature of the sample was confirmed by X-ray diffraction and SEM analysis. The Judd-Ofelt (JO) theory has been performed to investigate the intensity parameters (Omega(lambda), lambda = 2, 4 and 6) which intum used to predict luminescence properties. The chromaticity coordinates as well as pump wavelength dependent luminescence have been investigated. The decay curves are perfectly single exponential at lower concentration and gradually changes to non-exponential nature for higher concentrations (>0.1 mol%). The non-exponential decay curves are well fitted to the Inokuti-Hirayama (IH) model for S = 6 which indicates that the energy transfer between the donor and acceptor is of dipole-dipole type. The experimental lifetimes (tau(exp)) are found to be shortened with increase of Sm3+ ions due to the concentration quenching. Among the prepared glasses, 1.0 mol% Sm2O3 ions doped glass exhibits higher value of characteristic emission parameters and quantum efficiency for the (4)G(5/2) level suggests that it could be useful for optical devices, particularly visible laser applications. (C) 2014 Elsevier B.V. All rights reserved.