White light generation from Dy3+ doped tellurite glass

This paper reports on the spectral results of Dy3+ (1.0 mol%) ions-doped TeO2-ZnO-PbO-PbF2-Na2O (TZPPN) glass. Raman spectrum measurements, differential thermal analysis (DTA) profiles of this rare-earth ion-doped glass were carried out. From the DTA thermogram, glass transition (T-g), crystallization (T-c) and melting (T-m) temperatures were evaluated. Direct and indirect optical band gaps were calculated based on the glasses UV absorption spectra. From the absorption spectra, Judd-Ofelt (J-O) intensity parameters, Omega(k), were calculated. Using J-O intensity parameters, several radiative properties such as spontaneous transition probabilities (A(R)), radiative branching ratios (beta(R)) and radiative lifetimes (tau(R)) were determined for the excitation level F-4(9/2). From the emission spectra, a strong yellow emission at 574 nm (F-4(9/2) -> H-6(13/2)) was observed and it also showed a combination of blue and red emission bands for this glass. The stimulated emission cross-section sigma(lambda(p)) was also evaluated for the F-4(9/2) -> H-6(J) (J=11/2, 13/2, and 15/2) transitions. This study indicates that 1 mol% Dy(2)O(3)doped tellurite glass can be considered for white light generation with the excitation of blue light (454 nm). (C) 2013 Elsevier Ltd. All rights reserved.