Photoluminescence Properties of Dy³⁺ Ion-Doped Li₂O-PbO-Gd₂O₃-SiO₂ Glasses for White Light Application

Dy₂O₃-doped lithium lead gadolinium silicate glass was prepared for physical, optical, structural, X-ray induced luminescence and PL-luminescence properties for various potential applications in solid state lighting applications. JO parameters were estimated using JO theory. For the developed samples using emission spectra, CIE color coordinates and yellow/blue ratio are measured for white light emission. The transition ⁴F_9/2 → ⁶H_13/2 has higher value of stimulated emission cross section and radiative transition probability for all concentration showing its potential for laser emission. This transition has calculated and experimental branching ratio (β_R) more than 0.50. The CCT value for developed glass samples is 4264 K which is more than warm CCT (CCT > 4000 K). The allowed indirect (n = 2) and direct (n = 1/2) band gaps were determined and found to be decreasing with increasing Dy₂O₃ concentration. The lifetime non-exponential nature is fitted well to IH model for S = 6. The energy transfer parameter (Q) increases and experimental lifetime decreases for concentration increase of Dy³⁺ ions in LPDy glasses. The investigation shows the potential of LPDy glasses for the laser and white light generation application.