Optical characterization of Cu 2+ ion-doped zinc lead borate glasses

Abstract

We have developed a new series of zinc lead borate (ZLB) glasses by varying ZnO content, to enhance UV transmission, in the chemical composition of xZnO–15PbO–(85− x)B 2O 3, where x = 0 , 5, 10, 15, 20, 25, 30, 35, 40 and 45 mol% ZnO. From the measurement of UV absorption spectra both the direct and indirect band gaps have been evaluated. Also different physical properties of a reference glass of 45ZnO–15PbO–40B 2O 3 have been studied. From the measurement of refractive indices at six different wavelengths, Cauchy's constants ( A = 1.578743209 ; B = 131832.33 nm 2 and C = - 0.77756 × 1 0 10 nm 4 ) have been computed and a satisfactory correlation has been achieved between the theoretical and the experimental results. Absorption spectra of Cu 2+(45− x)ZnO–15PbO–40B 2O 3 (where x=0.1, 0.2, 0.5 and 1.0 mol%) have shown two absorption bands at 428 nm ( 2B 1g→ 2E g) and 777 nm ( 2B 1g→ 2B 2g). Emission spectra of (1.0 mol%) Cu 2+:ZLB have revealed two emission transitions at 400 and 493 nm with excitations at 288 and 316 nm.