Composition dependent structural and optical properties of Sm 3+ doped boro-tellurite glasses

Abstract

Boro-tellurite glasses with the composition (69– x)H 3BO 3+ xTeO 2+15MgCO 3+15K 2CO 3+1Sm 2O 3 (where x=0, 10, 20, 30 and 40 wt%) doped with trivalent samarium have been prepared and their structural and spectroscopic behavior were studied and reported. The FTIR spectra reveal the presence of BO 3 and BO 4 non-bridging oxygen as well as strong OH − bonds in the prepared glasses. Through the optical absorption spectra, Judd–Ofelt intensity parameters ( Ω λ , λ=2, 4 and 6) have been evaluated and the same is in turn used to predict radiative properties such as radiative transition probability ( A), stimulated emission cross-section ( σ P E ) and branching ratios ( β R) for the excited levels of Sm 3+ ions corresponding to 4G 5/2→ 6H 5/2, 4G 5/2→ 6H 7/2, 4G 5/2→ 6H 9/2 and 4G 5/2→ 6H 11/2 transitions. Structural and spectral dependence of the Sm 3+ ions due to the compositional changes have been examined and reported. The lifetime of the 4G 5/2 level is found to be non-exponential for all the prepared glasses indicating a cross-relaxation among the Sm 3+ ions. The structural and spectroscopic results corresponding to compositional changes have been compared with the similar studies and reported.