Spectrum regulation of YAG:Ce transparent ceramics with Pr, Cr doping for white light emitting diodes application
Spectrum regulation of YAG:Ce transparent ceramics with Pr, Cr doping for white light emitting diodes application
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白光发光二极管用Pr、Cr掺杂YAG:Ce透明陶瓷的光谱调控
DOI：
10.1016/j.jeurceramsoc.2017.03.061
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发表时间：
2017-08-01
影响因子：
5.7
通讯作者：
Jiang, Jun
中科院分区：
文献类型：
--
作者：
Feng, Shaowei;Qin, Haiming;Jiang, Jun
采用固相反应-真空烧结法制备了具有高发光效率和显色指数的YAG：Ce透明陶瓷。采用Cr ~（3+）和Pr ~（3+）对YAG：Ce透明陶瓷进行光谱扩展。所制备的陶瓷具有500 ~ 750 nm的发光光谱，几乎覆盖了整个可见光区。通过对Ce 3+、Pr 3+和Cr 3+的浓度进行优化，将YAG：Ce，Pr，Cr陶瓷与商用蓝光LED芯片耦合，获得了高质量的白色光。YAG：Ce，Pr，Cr陶瓷在450 nm LED激发下的色坐标从冷白色光区到暖白色光区变化。以YAG：Ce，Pr，Cr透明陶瓷封装的WLED的最高发光效率为89.3 Im/W，显色指数可达80左右。在共掺杂陶瓷体系中，证实了Ce ~（3+）-> Pr ~（3+）和Ce ~（3+）-> Cr ~（3+）之间的能量传递。本工作所制备的透明发光陶瓷在大功率WLED 5中具有很好的应用前景。(C)2017爱思唯尔有限公司版权所有
YAG:Ce transparent ceramics with high luminous efficiency and color render index were prepared via a solid state reaction-vacuum sintering method. Cr3+ and Pr3+ were applied to expand the spectrum of YAG:Ce transparent ceramics. As prepared ceramics exhibit luminescence spectrum ranging from 500 nm to 750 nm, which almost covers full range of visible light. After the concentration optimization of Ce3+, Pr3+ and Cr3+, high quality white light was obtained by coupling the YAG:Ce,Pr,Cr ceramics with commercial blue LED chips. Color coordinates of the YAG:Ce,Pr,Cr ceramics under 450 nm LED excitation vary from cold white light to warm white light region. The highest luminous efficiency of WLEDs encapsulated by transparent YAG:Ce,Pr,Cr ceramic was 89.3 Im/W, while its color render index can reach nearly 80. Energy transfers between Ce3+ -> Pr3+ and Ce3+ -> Cr3+ were proved in co-doped ceramic system. Transparent luminescence ceramics accomplished in this work can be quite prospective for high power WLED5 application. (C) 2017 Elsevier Ltd. All rights reserved.