Single-Phase White Light-Emitting CaxBa(9–x)Lu2Si6O24:Eu2+/Mn2+ Phosphors

Single-phase white light-emitting Ca x Ba (9- x ) Lu 2 Si 6 O 24 :Eu 2+ /Mn 2+ codoped phosphors were successfully synthesized, and their photoluminescence properties were experimentally determined. The analysis of the experimental results suggests that the partial substitution of Ba 2+ ions by smaller Ca 2+ ions alters the distribution of the Eu 2+ luminescence center among the three available Ba 2+ sites in the host lattice, which enables the emission to be efficiently tuned from blue to blue-green-yellow region. The incorporation of Mn 2+ ions resulted in a red light emission at around 618 nm, through energy transfer from Eu 2+ to Mn 2+ ions via dipole-dipole interactions. The incorporation of Ca 2+ and Mn 2+ ions also resulted in improved thermal stability. The results qualify the produced Ca x Ba (9- x ) Lu 2 Si 6 O 24 :Eu 2+ /Mn 2+ composition as a potential ultraviolet-convertible white light-emitting phosphor.