Influence of modifier oxide on emission features of Dy3+ ion in Pb3O4-ZnO-P2O5 glasses

Glasses of the composition Pb2O3-ZnO-P2O5: Dy3+ mixed with three different modifier oxides viz., MgO, CaO and SrO are prepared. The influence of modifier oxide on the luminescence characteristics of Dy3+ ions has been investigated. Using the intensities of various absorption bands of Dy3+ ions, the Judd-Ofelt parameters Omega(2), Omega(4) and Q(6) have been evaluated. Together with the J-O parameters and the luminescence spectra, various radiative properties like transition probability A, branching ratio beta(r), the radiative life time tau(r), and the emission cross-section sigma(E) for various emission levels of Dy3+ ions have been evaluated and reported. The values of these parameters were found to be influenced by modifier oxides. Among the three modifier oxides mixed glasses, the glasses mixed with CaO mixed glasses exhibited the highest luminescence efficiency. The results have been analyzed in the light of structural modifications taking place in the glass network with the help of IR spectral studies. (C) 2016 Elsevier B.V. All rights reserved.