Date

Place

Room C (Room 323)
10. LEDs and Lighting II
August 19, 2015 (Wednesday)
14:00 ~ 15:30

[10-2]
14:25 ~ 14:50
Title:[Invited] Improvements in High-Voltage LEDs and Applications
Ping-Chen Wu, Sin-Liang Ou, and Dong-Sing Wuu (Nat'l Chung Hsing Univ., Taiwan)
Abstract: In this study, we have proposed several techniques to fabricate various types of high-voltage light-emitting diodes (HV-LEDs) and improve their optoelectronic performance. The optical and electrical characteristics of HV-LEDs were investigated both experimentally and numerically. These techniques consist of laser lift-off, metal bonding, self-aligning contact, phosphor coating, and so on. Through the laser lift-off and metal bonding processes, the thin-film HV-LED can be prepared on Cu metal substrate with highly thermal conductivity. In the thin-film HV-LEDs, the effect of micro-LED geometry on the device performance was analyzed in detail. Additionally, after performing the self-aligning contact technique, the chamfer angle structure was formed in the side wall of each micro-LED, which can enhance the light extraction of conventional HV-LED. The influence of the u-GaN thickness on the performance of HV-LED with the chamfer angle structure was also characterized. Moreover, the fabrications and device performances of flip-chip type and ultraviolet HV-LEDs will be presented in this research. Furthermore, by employing the phosphor coating process, the white HV-LED was fabricated. These HV-LEDs proposed in our work can be practically applied for automobile lighting, high-power solid state lighting, and medical lighting.
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