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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 29, Iss. 17 — Sep. 1, 2004
  • pp: 2001–2003

Warm-white light-emitting diode with yellowish orange SiAlON ceramic phosphor

Ken Sakuma, Koji Omichi, Naoki Kimura, Masakazu Ohashi, Daiichiro Tanaka, Naoto Hirosaki, Yoshinobu Yamamoto, Rong-Jun Xie, and Takayuki Suehiro  »View Author Affiliations


Optics Letters, Vol. 29, Issue 17, pp. 2001-2003 (2004)
http://dx.doi.org/10.1364/OL.29.002001


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Abstract

A warm-white light-emitting diode (LED) without blending of different kinds of phosphors is demonstrated. An approach that consists of a blue LED chip and a wavelength-conversion phosphor is carried out. The phosphor is a newly developed yellowish orange CaEuSiAlON ceramic phosphor with high efficiency. The CIE1931 chromaticity coordinates (x, y) are (0.458, 0.414), the color temperature is 2750 K, and the luminous efficacy of this LED is 25.9 lm/W at room temperature and with a forward-bias current of 20 mA. The chromaticity of the assembled LED is more thermally stable than that of a LED with a conventional oxide phosphor (YAG:Ce) because of the better thermal stability of the oxynitride phosphor.

© 2004 Optical Society of America

OCIS Codes
(160.2540) Materials : Fluorescent and luminescent materials
(160.5690) Materials : Rare-earth-doped materials
(230.3670) Optical devices : Light-emitting diodes

Citation
Ken Sakuma, Koji Omichi, Naoki Kimura, Masakazu Ohashi, Daiichiro Tanaka, Naoto Hirosaki, Yoshinobu Yamamoto, Rong-Jun Xie, and Takayuki Suehiro, "Warm-white light-emitting diode with yellowish orange SiAlON ceramic phosphor," Opt. Lett. 29, 2001-2003 (2004)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-29-17-2001

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