Structural and spectroscopic studies on concentration dependent Sm3+ doped boro-tellurite glasses

Structural and spectroscopic dependence of Sm3+ ions in B2O3–TeO2–ZnO–Li2O glasses were studied and reported. The presence of asymmetric stretching vibration of B–O bonds in trigonal BO3 units, Te–O bond in TeO3 (tbp) and TeO4 (tp) units and the hydroxyl groups in the prepared glasses were explored through the FTIR spectral studies. The bonding parameters (β and δ) were calculated from the absorption spectral measurements. The Judd–Ofelt intensity parameters (Ωλ, λ = 2, 4, and 6) have been derived from the absorption spectra and are used to predict the radiative parameters for the excited levels 4G5/2 → 6H5/2, 4G5/2 → 6H7/2 and 4G5/2 → 6H9/2 of the Sm3+ ions. The lifetime spectra corresponding to the 4G5/2 level of the Sm3+ ion is found to be single exponential at lower concentration whereas it becomes non-exponential at higher concentration which is due to the energy transfer taking place among the neighboring Sm3+ ions.