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Energy Express

  • Editor: Bernard Kippelen
  • Vol. 19, Iss. S4 — Jul. 4, 2011
  • pp: A930–A936

Patterned structure of REMOTE PHOSPHOR for phosphor-converted white LEDs

Hao-Chung Kuo, Cheng-Wei Hung, Hsin-Chu Chen, Kuo-Ju Chen, Chao-Hsun Wang, Chin-Wei Sher, Chia-Chi Yeh, Chien-Chung Lin, Cheng-Huan Chen, and Yuh-Jen Cheng  »View Author Affiliations


Optics Express, Vol. 19, Issue S4, pp. A930-A936 (2011)
http://dx.doi.org/10.1364/OE.19.00A930


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Abstract

High efficiency white light-emitting diodes with superior color-mixing have been investigated. It is suggested that the patterned remote phosphor structure could improve the uniformity of angular-dependent correlated color temperature (CCT) and achieve high chromatic stability in wider operating current range, as compared to the conventional remote phosphor coating structure. In this experiment, we employed a pulse spray coating method to place the patterned phosphor on the package and to leave a window region. The window area, a clear space without coating of the phosphor not only increases the extraction efficiency of blue rays at large angle, but also improves the stability of angular-dependent CCT. Moreover, the CCT deviation could be reduced from 1320 K to 266 K by this patterned remote phosphor method, and the stray blue/yellow light within the package can be effectively reduced and controlled. The design was verified both experimentally and theoretically.

© 2011 OSA

OCIS Codes
(230.2090) Optical devices : Electro-optical devices
(230.3670) Optical devices : Light-emitting diodes

ToC Category:
Light-Emitting Diodes

History
Original Manuscript: March 18, 2011
Revised Manuscript: June 21, 2011
Manuscript Accepted: June 22, 2011
Published: July 1, 2011

Virtual Issues
Optics in LEDS for Lighting (2011) Optics Express

Citation
Hao-Chung Kuo, Cheng-Wei Hung, Hsin-Chu Chen, Kuo-Ju Chen, Chao-Hsun Wang, Chin-Wei Sher, Chia-Chi Yeh, Chien-Chung Lin, Cheng-Huan Chen, and Yuh-Jen Cheng, "Patterned structure of REMOTE PHOSPHOR for phosphor-converted white LEDs," Opt. Express 19, A930-A936 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-S4-A930


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