Dependence of Yellow Phosphor on Optical and Electrical Properties of the White Light Emitting Diode Chip

Abstract:

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We prepared the surface mounted white light emitting diode (LED) chips by using yellow phosphors on the blue LED chip. The optical and electrical properties of prepared white LED chips were investigated. The yellow phosphor mixed with transparent epoxy was coated on the prepared LED chip. The optimum mixing conditions with epoxy and yellow phosphor is obtained at the mixing ration of epoxy: yellow phosphor = 97 : 3 wt %. The maximum luminance and light emitting efficiency are above 80,000 cd/m2 and 23.2 lm/W, respectively, at the bias voltage of 2.9 V. There was no distinct change in the luminance strength with changing of the yellow phosphor ratios. The flowing current of the white LED chip is about 30 mA at 2.9 V.

Info:

Periodical:

Materials Science Forum (Volumes 510-511)

Edited by:

Hyung Sun Kim, Yu Bao Li and Soo Wohn Lee

Pages:

106-109

DOI:

10.4028/www.scientific.net/MSF.510-511.106

Citation:

C. S. Son et al., "Dependence of Yellow Phosphor on Optical and Electrical Properties of the White Light Emitting Diode Chip", Materials Science Forum, Vols. 510-511, pp. 106-109, 2006

Online since:

March 2006

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Price:

$35.00

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