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Near UV and blue-based LED fabricated with Ca8Zn(SiO4)4Cl2:Eu as green-emitting phosphor |
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| Authors: | Wei Lü Zhendong HaoXiaojun Wang Jiahua Zhang |
| Affiliation: | a Key Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China b Graduate School of Chinese Academy of Sciences, Beijing 100039, China c Department of Physics, Georgia Southern University, Statesboro, GA 30460, USA |
| Abstract: | Green-emitting phosphor Ca8Zn(SiO4)4Cl2:Eu2+ has been prepared by the solid state reaction method and there luminescence properties are investigated. The excitation spectrum of Ca8Zn(SiO4)4Cl2:Eu2+ shows an intense excitation band in the blue centered at 450 nm and emits with a maximum at 505 nm. The concentration quenching mechanism is studied and verified to be the energy transfer among the nearest-neighbor ions. Upon 450 nm excitation, the emission intensity of Ca8Zn(SiO4)4Cl2:Eu2+ is much stronger than the green emitting Ca3SO4Cl2:Eu2+ phosphor and even higher than YAG:Ce3+. This excitation spectrum range matches UV and blue light-emitting diodes (LEDS) chips very well, suggesting Ca8Zn(SiO4)4Cl2:Eu2+ could be a promising green emitting phosphor candidate for LED devices. |
| Keywords: | Phosphor Luminescence properties LED devices |
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