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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 21, Iss. S2 — Mar. 11, 2013
  • pp: A201–A207

Optics InfoBase > Energy Express > Volume 21 > Issue S2 > Page A201

High thermal stability of correlated color temperature using current compensation in hybrid warm white high-voltage LEDs

Kuo-Ju Chen, Hsuan-Ting Kuo, Hsin-Chu Chen, Min-Hsiung Shih, Chao-Hsun Wang, Shih-Hsuan Chien, Sheng Huan Chiu, Chien-Chung Lin, Ching-Jen Pan, and Hao-Chung Kuo  »View Author Affiliations


Optics Express, Vol. 21, Issue S2, pp. A201-A207 (2013)
http://dx.doi.org/10.1364/OE.21.00A201


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Abstract

This study experimentally and numerically examines the correlated color temperature (CCT) stability issue for hybrid warm white high-voltage light-emitting diodes (HV-LEDs) by using a current compensation method. This method could efficiently maintain the CCT stability factor at approximately 1.0 and yield greater color uniformity with Δ u ' v ' values ranging from 0.017 to 0.003 in CIE 1976 chromaticity coordinates. The simulation results show that the red chip intensity drop is the primary cause of CCT instability in the hybrid warm white system when the temperature increases. Therefore, Furthermore, results indicate that the relative lumen drop improves from 21% to 15% by using a current compensation method.

© 2013 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: August 1, 2012
Revised Manuscript: November 15, 2012
Manuscript Accepted: December 31, 2012
Published: January 14, 2013

Citation
Kuo-Ju Chen, Hsuan-Ting Kuo, Hsin-Chu Chen, Min-Hsiung Shih, Chao-Hsun Wang, Shih-Hsuan Chien, Sheng Huan Chiu, Chien-Chung Lin, Ching-Jen Pan, and Hao-Chung Kuo, "High thermal stability of correlated color temperature using current compensation in hybrid warm white high-voltage LEDs," Opt. Express 21, A201-A207 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-S2-A201


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