Design of a novel freeform lens for LED uniform illumination and conformal phosphor coating

被引：98

作者：

Hu, Run ^{[1
,2
]}

Luo, Xiaobing ^{[1
,2
]}

Zheng, Huai ^{[1
,2
]}

Qin, Zong ^{[3
]}

Gan, Zhiqiang ^{[3
]}

Wu, Bulong ^{[2
]}

Liu, Sheng ^{[1
,4
]}

机构：

[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China

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

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

[4] Huazhong Univ Sci & Technol, Sch Mech Sci & Engn, Wuhan 430074, Peoples R China

来源：

OPTICS EXPRESS | 2012年 / 20卷 / 13期

关键词：

LIGHT-EMITTING-DIODES; COLOR DISTRIBUTION; ARRAY;

D O I：

10.1364/OE.20.013727

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A conformal phosphor coating can realize a phosphor layer with uniform thickness, which could enhance the angular color uniformity (ACU) of light-emitting diode (LED) packaging. In this study, a novel freeform lens was designed for simultaneous realization of LED uniform illumination and conformal phosphor coating. The detailed algorithm of the design method, which involves an extended light source and double refractions, was presented. The packaging configuration of the LED modules and the modeling of the light-conversion process were also presented. Monte Carlo ray-tracing simulations were conducted to validate the design method by comparisons with a conventional freeform lens. It is demonstrated that for the LED module with the present freeform lens, the illumination uniformity and ACU was 0.89 and 0.9283, respectively. The present freeform lens can realize equivalent illumination uniformity, but the angular color uniformity can be enhanced by 282.3% when compared with the conventional freeform lens. (C) 2012 Optical Society of America

引用

页码：13727 / 13737

页数：11

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