Efficiency and droop improvement in hybrid warm white LEDs using InGaN and AlGaInP high-voltage LEDs

Kuo Ju Chen*, Hsuan Ting Kuo, Yen Chih Chiang, Hsin Chu Chen, Chao Hsun Wang, Min Hsiung Shih, Chien-Chung Lin, Ching Jen Pan, Hao-Chung Kuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

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/cm 2 ) 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.

Original languageEnglish
Article number6477169
Pages (from-to)280-284
Number of pages5
JournalIEEE/OSA Journal of Display Technology
Volume9
Issue number4
DOIs
StatePublished - 4 Apr 2013

Keywords

  • High voltage
  • light-emitting diodes (LEDs)
  • phosphor
  • warm white

Fingerprint Dive into the research topics of 'Efficiency and droop improvement in hybrid warm white LEDs using InGaN and AlGaInP high-voltage LEDs'. Together they form a unique fingerprint.

Cite this