Highly efficient downconversion white light in Tm^3+/Tb^3+/Mn^2+tridoped P_2O_5-Li_2O-Sb_2O_3 glass

Tm3+/Tb3+/Mn2+ tridoped phosphate glasses containing different Mn2+ ion concentrations were synthesized to explore new white-light-emitting material. Under 355 nm excitation, the CIE coordinates (x=0.328, y=0.337) of the Mn0.10 sample doped with 0.10 wt. %Mn2+ are close to the standard equal energy white-light illumination (x=0.333, y=0.333). The quantum efficiency of the Mn0.01 sample is very high (∼72.32%). The concentration of Mn2+ ions has a great effect on the emission color, and the energy transitions from Tm3+, Tb3+ to Mn2+ become more intense with an increase in Mn2+ ion concentrations. The phenomenon is reasonably interpreted based on the analysis of the luminescence lifetime.