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<sup>2</sup>) 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.
© 2013 IEEE
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