摘要
Pr^(3+)-doped CaAl_(2)O_(4) phosphors with broad yellow emission were synthesized by conventional solid-state reaction in air and their structural and luminescent properties were investigated.A pure monoclinic structure can be obtained when the sintering temperature is 1400℃ or above.With photoluminescence(PL)measurement,the excitation was observed at 450–500 nm,which covered the emission of the blue light-emitting diode(LED)chips.Emission of the phosphors showed a green band and a red band.So these phosphors showed great potential in application of warm white LEDs without reabsorption.Additionally,the optimal emission intensity was obtained when Pr doping level was at 0.2 mol%.Furthermore,the Pr-doped CaAl_(2)O_(4) phosphors have the higher quenching temperature.With an increase in temperature,the emission bands of Pr-doped CaAl_(2)O_(4) showed an abnormal blue-shift.
基金
supported by the Natural Science Foundation of China(No.51072136)
Specialized Research Fund for the Doctoral Program of Higher Education(No.20090072120034).
