Luminescence, structural and dielectric properties of Sm3+ impurities in strontium lithium bismuth borate glasses

Abstract

In the present work, different concentrations of Sm3+doped strontium lithium bismuth borate glasses (SLBiB) have been prepared by melt quench technique and investigated their optical, structural and dielectric properties. The amorphous nature of the prepared glass samples was confirmed by X-ray diffraction and SEM analysis. The spectroscopic properties of these glasses were investigated by recording optical absorption, photoluminescence and decay curve analysis. Judd–Ofelt (J–O) theory has been applied for the f↔f transitions of Sm3+ ions to evaluate J–O intensity parameters, Ωλ (λ=2, 4 and 6). Using the J–O intensity parameters, radiative properties such as transition probabilities (AR), calculated branching ratios (β) and radiative lifetimes (τ) are estimated. From the emission spectra, effective bandwidths (Δλeff) and stimulated emission cross-sections (σp) have been obtained for observed emission levels. From the emission spectra, a strong reddish-orange emission corresponding to the transition, 4G5/2→6H7/2 was observed. The nature of decay curves of 4G5/2 level for different Sm3+concentrations in SLBiB glass has been analyzed. FTIR spectra were recorded to analyze the functional groups present in the glass matrix. From the dielectric properties, variation of dielectric constant, dielectric loss and ac conductivity of Sm3+ doped different glass samples with the variation of frequency was studied.