Spectroscopic investigations on Pr3+ and Nd3+ doped strontium–lithium–bismuth borate glasses

Abstract

Spectroscopic investigations on different concentrations (0.1, 0.5, 1.0, 1.5 and 2.0mol%) of Pr3+ and Nd3+ doped strontium lithium bismuth borate glasses have been done. X-ray diffraction, SEM with EDS, absorption and luminescence spectra were recorded for all the glass matrices and analyzed. X-ray diffraction profiles and SEM images conformed amorphous nature of investigated glass samples. EDS spectra of host glass and Pr3+doped glass matrices gave information about the chemical composition of glass samples. From the absorption spectra of Pr3+ and Nd3+ ions, Judd–Ofelt (J–O) intensity parameters (Ωλ,λ=2, 4 and 6) have been calculated and compared with other glass matrices. The emission characteristics such as radiative lifetimes (τR), measured and calculated branching ratios (β) and stimulated emission cross-sections (σP) have been obtained for the observed emission transitions of Pr3+ and Nd3+ ions in the above glass matrix for all the concentrations. From the emission spectra of Pr3+ and Nd3+ doped glass matrices, the effect of concentration on the quenching of intensity of 1D2→3H4 transition of Pr3+ ion and 4F3/2→4I9/2, 4I11/2 and 4I13/2 transitions of Nd3+ have been studied and discussed.