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Proceedings Paper

Characteristics of high-efficiency InGaN-based white LED lighting
Author(s): Yuji Uchida; Tatsumi Setomoto; Tsunemasa Taguchi; Yoshinori Nakagawa; Kazuto Miyazaki
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Paper Abstract

The basic illumination characteristics of an efficient white LEDs lighting source, which is composed of cannon-ball type 10 cd-class InGaN-based white LEDs, are described. It is noted that the temperature and forward-bias current dependence under full wave rectification of AC 100 V gives a significant effect to both electroluminescence properties and luminous efficacy. We have obtained a maximum luminous intensity of 95000 cd/m2 and a luminous efficacy of about 27 lm/W at an electric power of 20 W (at a constant current of 10 mA). The developed white LEDs lighting source indicates two injection electroluminescence peaks at 465 and 555 nm, which are originated from a blue LED and a YAG:Ce3+ phosphor, respectively. The illuminance distribution of the LED lighting source was analyzed using our `multi sources of LED light' theory. We have performed the design of a street lighting as the practical application using the 700 LEDs array lighting source.

Paper Details

Date Published: 30 June 2000
PDF: 7 pages
Proc. SPIE 4079, Display Technologies III, (30 June 2000); doi: 10.1117/12.389397
Show Author Affiliations
Yuji Uchida, Yamaguchi Univ. (Japan)
Tatsumi Setomoto, Yamaguchi Univ. (Japan)
Tsunemasa Taguchi, Yamaguchi Univ. (Japan)
Yoshinori Nakagawa, Nichia Corp. (Japan)
Kazuto Miyazaki, Nichia Corp. (Japan)

Published in SPIE Proceedings Vol. 4079:
Display Technologies III
I-Wei Wu; Heiju Uchiike, Editor(s)

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