Spectral investigation of lithium-telluride based glasses doped with Sm3+-ions for lighting application

Glasses with compositions TeO2-BaO-Li2O-GeO2:Sm2O3 were prepared by melt-quenching technique and labeled 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 (4)G(5/2)-> H-6(5/2), (4)G(5/2)-> H-6(7/2), (4)G(5/2)-> H-6(9/2) and (4)G(5/2)-> H-6(11/2), 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. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study reports the radiative, physical, optical, and luminescence properties of glasses with compositions TeO2-BaO-Li2O-GeO2:Sm2O3. The emission spectra showed four emission peaks at specific wavelengths, with the highest emission intensity observed at 1.0 mol% Sm3+ ion concentration. Non-radiative energy transfer was identified as the main cause of the decrease in emission intensity.