title: High thermal stability of correlated color temperature using current compensation in hybrid warm white high-voltage LEDs.
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.
authors.affiliation: Department of Photonics & Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan.
authors.forename: Kuo-Ju
authors.initials: KJ
authors.lastname: Chen
authors.forename: Hsuan-Ting
authors.initials: HT
authors.lastname: Kuo
authors.forename: Hsin-Chu
authors.initials: HC
authors.lastname: Chen
authors.forename: Min-Hsiung
authors.initials: MH
authors.lastname: Shih
authors.forename: Chao-Hsun
authors.initials: CH
authors.lastname: Wang
authors.forename: Shih-Hsuan
authors.initials: SH
authors.lastname: Chien
authors.forename: Sheng Huan
authors.initials: SH
authors.lastname: Chiu
authors.forename: Chien-Chung
authors.initials: CC
authors.lastname: Lin
authors.forename: Ching-Jen
authors.initials: CJ
authors.lastname: Pan
authors.forename: Hao-Chung
authors.initials: HC
authors.lastname: Kuo