Emission analysis of Dy3+ and Pr3+:Bi2O3-ZnF2-B2O3-Li2O-Na2O glasses

In this paper, we present the spectral results of Dy3+ and Pr3+ (1.0 mol%) ions doped Bi2O3-ZnF2-B2O3-Li2O-Na(2)o glasses. Measurements of X-ray diffraction (XRD), differential scanning calorimetry (DSC) profiles of these rare-earth ions doped glasses have been carried out. From the DSC thermograms, glass transition (T-g), crystallization (T-c) and melting (T-m) temperatures have been evaluated. The direct and indirect optical band gaps have been calculated based on the glasses UV absorption spectra. The emission spectrum of Dy3+ :glass has shown two emission transitions F-4(7/2) -> H-6(15/2) (482 nm) and F-4(7/2) H-6(13/2) (576 nm) with an excitation at 390 nm wavelength and Pr3+: glass has shown a strong emission transition D-1(2) -> H-3(4) (610 nm) with an excitation at 445 nm. Upon exposure to UV radiation, Dy3+ and Pr3+ glasses have shown bright yellow and reddish colors, respectively, from their surfaces. (C) 2007 Elsevier B.V. All rights reserved.