Improvement in optical performance and color uniformity by optimizing the remote phosphor caps geometry for chip-on-board light emitting diodes

被引：14

作者：

Li, Jiasheng ^{[1
]}

Li, Zongtao ^{[1
,2
]}

Li, Zhi ^{[1
]}

Tang, Yong ^{[1
]}

Ding, Xinrui ^{[3
]}

Yu, Binhai ^{[1
]}

机构：

[1] South China Univ Technol, Guangdong High Educ Inst, Key Lab Surface Funct Struct Mfg, Guangzhou 510641, Guangdong, Peoples R China

[2] Foshan Nationstar Optoelect Co Ltd, Foshan 528000, Peoples R China

[3] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA

来源：

SOLID-STATE ELECTRONICS | 2016年 / 126卷

基金：

中国国家自然科学基金;

关键词：

Remote phosphor; Chip-on board (COB); Light-emitting diodes (LEDs); Optical performance; Color uniformity; CONVERTED WHITE LEDS; IN-GLASS; CONFIGURATION; EFFICIENCY; PACKAGE; DEVICES; FILM;

D O I：

10.1016/j.sse.2016.09.020

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The remote phosphor caps (RPCs) have been studied theoretically and experimentally based on chip-on-board (COB) devices. We have investigated the effect of RPCs on the blue light and the yellow light emission distributions by ray-tracing. Moreover, the geometry of RPCs have been optimized to simultaneously achieve an excellent optical performance and color uniformity. Corresponding to simulation results, both the optimized (conical shape without straight side) and the reference (semi-spherical shape with straight side) RPCs have been manufactured by the compression molding method. These RPCs were assembled to the same blue COB source and then the COB devices have been measured. Compared with the reference RPC, the optimized RPC is able to significantly increase the radiant power and the luminous flux by 15.9% and 17.0% at a driving current of 350 mA, respectively, and it can also decrease the standard deviation of the correlated color temperature (CCT) by 48.9% for a total CCT about 4800 K. Hence, the proposed RPCs can provide a superior improvement in optical performance and color uniformity to COB devices. (C) 2016 Elsevier Ltd. All rights reserved.

引用

页码：36 / 45

页数：10

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