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Enhancement of Flip-Chip Light-Emitting Diodes With Omni-Directional Reflector and Textured Micropillar Arrays

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8 Author(s)
Chia-En Lee ; Nat. Chiao Tung Univ., Hsinchu ; Yi-Jiun Lee ; Hao-Chung Kuo ; Meng-Ru Tsai
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The flip-chip light-emitting diodes (FC-LEDs) with a conductive omni-directional reflector and textured micropillar arrays were investigated. The micropillar arrays structure was formed on the bottom side of sapphire substrate by dry etching process to increase the light-extraction efficiency. The light output power of the FC-LED was increased by 65% for a 3.2-mum textured micropillar on the bottom side of the sapphire substrate. Our work offers promising potential for enhancing output powers of commercial light-emitting devices.

Published in:

Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 16 )