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Efficiency and Droop Improvement in Hybrid Warm White LEDs Using InGaN and AlGaInP High-Voltage LEDs

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9 Author(s)
Kuo-Ju Chen ; Dept. of Photonics, Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Hsuan-Ting Kuo ; Yen-Chih Chiang ; Hsin-Chu Chen
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This study investigates the optical and electrical characteristics in hybrid warm white high-voltage light-emitting diodes (HV-LEDs). The luminous efficiency of the hybrid warm white LED in this study improved by 11% and 51%, compared to conventional cool and warm LEDs, respectively, solving the warm white gap in white LEDs. The efficiency droop of the hybrid warm white LED was reduced to 21.8% from 26.8% for the conventional cool white LED, and from 26.3% in the conventional warm white LED at 40 mA (35 A/cm2) the operated current. Furthermore, the color rendering index (CRI) and angular correlated color temperature (CCT) were analyzed, indicating a significant improvement in hybrid warm white HV-LEDs.

Published in:

Display Technology, Journal of  (Volume:9 ,  Issue: 4 )

Date of Publication:

April 2013

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