摘要
In this work, the synthesis and photoluminescence characteristics of two new phosphors Pr3+: CaYAlO4(CYA) and Pr3+/Tb3+: CYA for light emitting diodes(LEDs) are investigated. 0.5%(atom percentage) Pr3+: CYA exhibits the largest bright yellow emission by varying the Pr3+ concentration, owing to the cross-relaxation process of 3P0 +3H4→ 1G4+1G4. The energy level diagram in Pr3+: CYA, especially the positions of 4f5 d level and 1S0 level, is discussed. By co-doping Tb3+ ions, the color coordinates of Pr3+/Tb3+: CYA phosphor can be tuned from yellow to white region. Finally, the strongest luminescence emission with color coordinates of(0.339, 0.364) located in the white region can be obtained in 0.3%Tb3+/0.5%Pr3+: CYA phosphor.
基金
supported by the Natural Science Foundation of Fujian University of Technology(No.4Y-Z15001)
