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Jpn. J. Appl. Phys. 42 (2003) pp. 2284-2287  |Next Article|  |Table of Contents|
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n-UV+Blue/Green/Red White Light Emitting Diode Lamps

Cheng-Huang Kuo1, Jinn-Kong Sheu2, Shoou-Jinn Chang1, Yan-Kuin Su1, Liang-Wen Wu1, Ji-Ming Tsai3, C. H. Liu4 and R. K. Wu5

1Institute of Microelectronics, Department of Electrical Engineering, National Cheng Kung University Tainan 701, Taiwan
2Optical Science Center, National Central University, Chung-Li 320, Taiwan
3South Epitaxy Corporation, Hsin-shi 744, Tainan County, Taiwan
4Department of Electronic Engineering Nan-Jeon Junior College of Technology and Commerce, Yan-Hsui, 737, Taiwan
5Nantex Industry Corporation, Lin-Yuan 832, Kaohsiung County, Taiwan

(Received September 17, 2002; accepted for publication November 18, 2002)

Phosphor-conversion light-emitting diode (LED) lamps were fabricated by precoating blue/green/red phosphors onto near-ultraviolet (n-UV) LED chips prior to packaging them into LED lamps. With a 20 mA injection current, it was found that the color temperature, Tc, was approximately 5900 K, the color rendering index, Ra, was approximately 75, and the CIE color coordinates were x=0.33 and y=0.35 for the “n-UV+blue/green/red” white LED lamps. No obvious changes in color temperature, Tc, or color-rendering index, Ra, could be observed when we increased the injection from 20 mA to 60 mA. These results indicate that such “n-UV+blue/green/red” white LED lamps are much more optically stable than the conventional “blue+yellow” LED lamps.

URL: http://jjap.jsap.jp/link?JJAP/42/2284/
DOI: 10.1143/JJAP.42.2284
KEYWORDS:white light, LED, phosphor, color temperature, color-rendering index


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