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

Dy 2 O 3 -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 4 F 9/2 → 6 H 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 Dy 2 O 3 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 Dy 3+ ions in LPDy glasses. The investigation shows the potential of LPDy glasses for the laser and white light generation application.