Angular color uniformity enhancement of white light-emitting diodes integrated with freeform lenses

被引：70

作者：

Wang, Kai ^{[1
,2
]}

Wu, Dan ^{[1
,2
]}

Chen, Fei ^{[1
,2
]}

Liu, Zongyuan ^{[1
]}

Luo, Xiaobing ^{[1
]}

Liu, Sheng ^{[1
,2
]}

机构：

[1] Wuhan Natl Lab Optoelect, Div MOEMS, Wuhan 430074, Peoples R China

[2] Huazhong Univ Sci & Technol, Sch Optoelect Sci & Engn, Wuhan 430074, Peoples R China

来源：

OPTICS LETTERS | 2010年 / 35卷 / 11期

基金：

中国国家自然科学基金;

关键词：

LEDS;

D O I：

10.1364/OL.35.001860

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate a freeform lens to enhance the angular color uniformity (ACU) of white light-emitting diodes (LEDs) whose phosphor layers were coated by freely dispersed coating processes. Monte Carlo ray tracing simulation results indicated that the ACU of the modified LED integrated with the freeform lens significantly increased from 0.334 to 0.957, compared with the traditional LED. Enhancement of ACU reached as high as 186.5%. Moreover, the ACU of the modified LED was not only at a high level, but also stable when the shape of the phosphor layer changed. The freeform lens provided an effective way to achieve white LEDs with high ACU at low cost. (C) 2010 Optical Society of America

引用

页码：1860 / 1862

页数：3

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