Luminescence properties of Dy3+ doped different fluoro-phosphate glasses for solid state lighting applications

Dy3+ doped different fluoro-phosphate glasses are prepared and they are characterized by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR), Raman, optical absorption, and photoluminescence (PL) techniques. The structural characterization is accomplished by XRD, FTIR and Raman spectroscopy. The morphological analysis was performed by SEM. The absorption spectra have been analyzed using Judd-Ofelt theory and the intensity parameters have been evaluated. These parameters are used to calculate radiative properties such as emission probabilities (A(R)), radiative lifetimes (tau(R)) and integrated absorption cross-sections (Sigma) for different Dy3+ transitions. The PL spectra exhibit bands in the blue, yellow and red regions. Furthermore, the dependence of luminescence properties such as stimulated emission cross-sections (sigma(p)) and branching ratios (beta) on different metal cations in these glasses is studied. From decay curve analysis, the lifetimes of the excited state F-4(9/2) have been measured. The calorimetric property is also studied based on Commission International del'Eclairage (CIE) standards for Dy3+ doped different fluoro-phosphate glasses and discussed. (C) 2014 Elsevier B.V. All rights reserved.