Low thermal quenching and high-efficiency Ce 3+, Tb 3+-co-doped Ca 3Sc 2Si 3O 12 green phosphor for white light-emitting diodes

Abstract

Low thermal quenching and high-efficiency Ca 3Sc 2Si 3O 12:Ce 3+ (CSSO:Ce 3+) phosphors with co-doping Tb 3+ ion were prepared by a solid state method and the properties of these phosphors were investigated. The results showed that co-doping of Tb 3+ not only enhances the photoluminescence remarkably and decreases the thermal quenching of the phosphor, but also heightens the performances of the LEDs fabricated with the phosphor. A high-efficiency and low color temperature white LED was fabricated with the prepared CSSO:1%Ce 3+, 0.5%Tb 3+ and a red phosphor, indicating that CSSO:1%Ce 3+,0.5%Tb 3+ phosphor is a suitable green phosphor for the fabrication of high-efficiency white LEDs.