Spectral analysis of Cu2+: B2O3-ZnO-PbO glasses

A new series of heavy metal oxide (PbO) based zinc borate glasses in the chemical composition of (95 - x)B-2 O-3-5ZnO-xPbO (x = 10, 15, 20, 25, 30, 35, 40, 45 and 50 mol%) have been prepared to verify their UV filtering performance. Both direct and indirect optical band gaps (E-opt) have been evaluated for these glasses. For a reference glass of 45B(2)O(3)-5ZnO-50PbO, refractive indices at different wavelengths are measured and found the results satisfactorily correlated with the theoretical data upon the computation of Cauchy's constants of A = 1.766029949, B = 159531.024 nm(2) and C = -1.078 x 10(10) nm(4). Measurements concerning X-ray diffraction (XRD), FT-IR, differential scanning colorimeter (DSC) profiles have been carried out for this glass. The FT-IR profile has revealed that the glass has both BO3 and BO4 units. From DSC thermogram, glass transition temperature (T-g), crystallization temperature (T-c) and melting temperature (T-m) have been located and from them, other related parameters of the glass have also been calculated. Visible absorption spectra of 45B(2)O(3)-5ZnO-(50- x)PbO-XcuO (x=0. 1, 0.2, 0.5 and 1.0 mol%) have revealed two absorption bands at around 400nm (B-2(1g) -> E-2(g)) and 780nm (B-2(1g) -> B-2(2g)) Of Cu2+ ions, respectively. Emission bands at 422 and 512nm are found for the 1 mol% CuO doped glass with excitations at 306 and 332 nm. (c) 2005 Elsevier B.V. All rights reserved.