Photoluminescence and white light generation behavior of lithium gadolinium silicoborate glasses

The Dy³⁺-doped lithium gadolinium silica borate glasses with composition (in mol%) 40Li₂O:15Gd₂O₃:5SiO₂: (40-x)B₂O₃:xDy₂O₃, x = 0.01, 0.1, 0.5, 1.0, 2.0 were prepared by melt quenching technique and characterized through absorption and emission spectra, CIE chromaticity coordinates and decay rate analysis. Judd-Oflet parameters have been calculated for lithium gadolinium silico borate glass and used for the derivation of radiative properties for excited luminescent levels of Dy³⁺ ions. The feasibility of white light generation have been evaluated by the yellow-to-blue emission intensity ratios and CIE chromaticity coordinates as a function of Dy³⁺ concentration. The non-exponential decay rates are well-fitted to Inokuti-Hirayama model for S = 6. The perceived non-exponential decay nature and life time quenching have been ascribed to the energy transfer between excited and unexcited Dy³⁺ ions through dipole–dipole interaction. The CCT values for the present studied glasses obtained in the 4584-4235 K at λ_exc = 387 nm. These CCT values are below the warm CCT (i.e CCT 4000 K). The reasonably good luminescence properties of LGSiBDy10 glass indicates the potentiality of the title of glass to be applied as lasing medium for white light generation.