Influence of optimized concentration of Dy3+ ions on optical and luminescence properties of P2O5 + Bi2O3 + Na2CO3 + SrF2 glasses for solid state visible laser and w-LED applications

Abstract The fluoride-based bismuth phosphate (PBNS) glasses are doped with Dysprosium ions are fabricated by using the method conventional melt quenching. For synthesized PBNS glasses physical parameters were evaluating, moreover, the structural, optical, and fluorescence properties were analyzed/studied by XRD, FTIR, EDAX, photoluminescence study analysis, and optical absorption. The optical band gap is estimated based on the tauc's curve extracted from the absorption spectrum, and the value obtained shows a non-linear behavior with the concentration of doping ions. The intensity parameters (Ω2, Ω4, Ω6.) were evaluated using Judd – Ofelt theory and which follows Ω2 > Ω4 > Ω6 trend. From the emission spectra, the PBNSDy glasses doped with 1.0 mol% Dysprosium ions (PBNSDy10) attains the higher emission peak intensity among the prepared glasses. The 6H15/2 → 6F11/2 transition emitting the radiation at 473 nm was more intense than the other transition and attains a higher value for optical gain bandwidth (28.66 × 10−25 cm2S), Stimulated emission cross-section (5.45 × 10−21 cm2) and branching ratio (0.63). The emission spectra are used to evaluate by colorimetric analysis of the 1931 CIE color coordinates, Y/B intensity ratio, and CCT values to see the adaptability of the fluorophosphate glass to solid-state white light LED applications.