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Origin of the discrepancy between photoluminescence brightness of TAG:Ce and electroluminescence brightness of TAG:Ce-based white LED expected from phosphor brightness

机译:荧光粉亮度可预测的TAG:Ce的光致发光亮度与TAG:Ce基白色LED的电致发光亮度之间的差异

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摘要

A yellow-emitting Tb3Al5O12:Ce (TAG:Ce) phosphor was coated on blue light-emitting diodes (LEDs) tonobtain white LEDs (WLEDs). Since TAG:Ce showed 90% of the brightness of Y3Al5O12:Ce3+ (YAG:Ce), itnwas expected that TAG:Ce-based WLEDs showed 90% of brightness of YAG:Ce-based ones. However, thenTAG:Ce-based WLED showed 74% of the brightness of YAG:Ce-based one. Considering the density and sizenof the phosphors, the higher density and larger size of TAG:Ce induced a great deal of sedimentation ofnTAG:Ce particles in an epoxy resin. It is believed that this is one of main reasons for the reduced opticalnpower of the TAG:Ce-based WLED compared to that of the WLED expected from the brightness of TAG:Ce.n© 2008 Optical Society of America
机译:将发黄光的Tb3Al5O12:Ce(TAG:Ce)荧光粉涂覆在发蓝光的二极管(LED)上,以获得白光LED(WLED)。由于TAG:Ce显示出Y3Al5O12:Ce3 +(YAG:Ce)亮度的90%,因此可以预期基于TAG:Ce的WLED显示出基于YAG:Ce的WLED亮度的90%。但是,基于TAG:Ce的WLED的亮度仅为基于YAG:Ce的WLED的74%。考虑到荧光粉的密度和尺寸,TAG:Ce的较高密度和较大尺寸引起了环氧树脂中nTAG:Ce颗粒的大量沉淀。可以认为,这是与TAG:Ce的亮度预期的WLED相比,基于TAG:Ce的WLED的光功率降低的主要原因之一。©2008美国光学学会

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  • 来源
    《Optics Letters》 |2008年第18期|p.2140-2142|共3页
  • 作者单位

    Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1,Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea* Corresponding author: dyj@kaist.ac.kr;

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