Spectral conversion with fluorescent microspheres for light emitting diodes

被引:14
作者
Hui, K. N. [1 ]
Lai, P. T. [1 ]
Choi, H. W. [1 ]
机构
[1] Univ Hong Kong, Dept Elect & Elect Engn, Hong Kong, Hong Kong, Peoples R China
关键词
D O I
10.1364/OE.16.000013
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
An innovative spectral conversion scheme for light emitting diodes using fluorescent microspheres has been demonstrated. An optimally mixed proportion of green and red fluorescent microspheres were coated onto a high-extraction-efficiency GaN micro-LED with emission centred at 470 nm. The microspheres self-assemble into ordered hexagonally arrays, forming regular and uniform coating layers. Devices with cool and warm white emission were achieved. The bluish-white LED has a luminous efficacy of 27.3 lm/W (at 20 mA) with CIE coordinates of (0.26, 0.28) and 8500K CCT, while the yellowish-white LED has a luminous efficacy of 26.67 lm/W ( at 20 mA) with CIE coordinates of (0.36, 0.43) and 13000K CCT. (c) 2007 Optical Society of America.
引用
收藏
页码:13 / 18
页数:6
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