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Low temperature quenching and high efficiency Tm, La or Tb co-doped CaSc2O4:Ce phosphors for light-emitting diodes |
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| Authors: | Yibo Chen Kok Wai Cheah |
| Institution: | a School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China b State Key Laboratory of Optoelectronic Materials and Technologies, Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China c Department of Physics, Hong Kong Baptist University, Hong Kong, China |
| Abstract: | Low temperature quenching and high efficiency CaSc2O4:Ce3+ (CSO:Ce3+) phosphors co-doped with Tm3+, La3+ and Tb3+ ions were prepared by a solid state method and the phase-forming, morphology, luminescence and application properties of these phosphors were investigated. The results showed that co-doping of Tm3+, La3+ and Tb3+ ions can improve the luminescence properties and decrease temperature quenching of CSO:Ce3+ phosphor remarkably. High efficiency green-light-emitting diodes were fabricated with the prepared phosphors and InGaN blue-emitting (∼460 nm) chips. The good performances of the green-light-emitting LEDs made from co-doped CSO:Ce3+ phosphors confirm the luminescence enhancement and indicate that Tm3+, La3+ and Tb3+ co-doped CSO:Ce3+ phosphors are suitable candidates for the fabrication of high efficiency white LEDs. |
| Keywords: | LED Phosphor CaSc2O4:Ce3+ Co-doping |
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