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, Hao-Chung Kuo

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

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 Δu ’ 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.

Original languageEnglish
Pages (from-to)A201-A207
Number of pages7
JournalOptics Express
Volume21
Issue number102
DOIs
StatePublished - 11 Mar 2013

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