Spectral Investigation of Lithium-Telluride based Glasses doped with Sm3+-Ions for lighting application

Abstract Glasses with compositions TeO2-BaO-Li2O-GeO2:Sm2O3 were prepared by melt-quenching technique and labelled by TBaLG-Sm. In this study, we report their radiative, physical, optical and luminescence properties. In the emission spectra, four emission peaks were observed at 563 nm, 599 nm, 645 nm, 707 nm wavelengths with corresponding transitions as 4G5/2→6H5/2, 4G5/2→6H7/2, 4G5/2→6H9/2 and 4G5/2→6H11/2, respectively. Up to 1.0 mol% of Sm3+-ion concentration the emission intensity increases, followed by decreasing with further increasing Sm3+-ion content. A non-radiative energy transfer via cross-relaxation channels between Sm-Sm ions is the main cause of decrease in emission intensity. Computing from the absorption and emission spectra, the Judd-Ofelt parameters, radiation transition probability, spectroscopic quality factors and emission cross section were evaluated. The color coordinates of all samples lie in the orange region of the Commission International de l'Eclairage diagram. The large values of branching ratios and stimulated emission cross-section reveal that the studied glass con be used as a lasing material and a lighting device.