Spectroscopic studies on Sm3+ ions doped modifiers incited calcium phospho-silicate glasses for photonic and optoelectronic applications

Abstract

In order to learn the effect of incorporating the alkaline modifiers into the network of Sm3+ ions incorporated calcium-phospho silicate glass matrices, the glasses were synthesized by the usual melt-quench procedure with the novel compositional matrix 40P2O5+11SiO2+(30‒X) CaO+XMgO+6Sr2F+6LiF+6BaF+1Sm2O3 where (X=0, 5, 10, 15, 20, 25). The impact of concentration variation in alkaline modifiers (CaO and MgO) is carried out by several spectroscopic scrutinize such as UV–Vis-NIR absorption, and luminescence spectra on Sm3+ doped glasses. Incremental trend of absorption intensity is observed while decreasing the MgO's concentration and similarly, luminescence intensity gets increased. The trend of Judd-Ofelt (Ω6˃Ω4˃Ω2) parameters casts the ionic temperament of Sm−O bond and rigid binding between Sm3+ and chosen host. The ionic nature is further justified by the negative significance of the bonding parameter (δ) and also the provision of symmetric character of the Sm3+ ions by the calcium-phospho silicate host. Through Ω6, Ω4, and Ω2 parameter values, vital characteristics like emission cross-sections (σPE), effective bandwidth (Δλeff) or FWHM (full-width half maximum), branching ratio (βR), transition probabilities (A), and experimental lifetime (τexp) were calculated for the grading of lasing potential. Glass with 30% of CaO exhibits about 57% of branching ratio deliberated for 4G5/2→ 6H7/2 transition, shorter bandwidth, and higher transition probability are the disclosure of potential for lasing and LED applications. Quantum efficiency (η) is observed to be on the higher side for the glass with equal wt% of both CaO and MgO. The decay of 4G5/2 states was monitored, showing a non-exponential manner and it is consistent with all the prepared glasses. Along with color purity, Color coordinates (x, y) suggested that the emission wavelength of all other glasses is located at the reddish-orange region except for the glass with 30% of CaO. The emission line shifted nearer to the white light region.