Crystal Quality and Light Output Power of GaN-Based LEDs Grown on Concave Patterned Sapphire Substrate

YewChung Sermon Wu; A Panimaya Selvi Isabel; Jian-Hsuan Zheng; Bo-Wen Lin; Jhen-Hong Li; Chia-Chen Lin

doi:10.3390/ma8041993

Crystal Quality and Light Output Power of GaN-Based LEDs Grown on Concave Patterned Sapphire Substrate

Materials (Basel). 2015 Apr 22;8(4):1993-1999. doi: 10.3390/ma8041993.

Authors

YewChung Sermon Wu¹, A Panimaya Selvi Isabel², Jian-Hsuan Zheng³, Bo-Wen Lin⁴, Jhen-Hong Li⁵, Chia-Chen Lin⁶

Affiliations

¹ Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan. sermonwu@stanfordalumni.org.
² Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan. selvi.isabel@gmail.com.
³ Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan. one123.piece@msa.hinet.net.
⁴ Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan. lbwferro@gmail.com.
⁵ Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan. lijhenhong.mse99@nctu.edu.tw.
⁶ Department of Materials Science and Engineering, National Chiao Tung University, 1001 University Road, Hsinchu 300, Taiwan. jdmhicp@yahoo.com.tw.

Abstract

The crystal quality and light output power of GaN-based light-emitting diodes (LEDs) grown on concave patterned sapphire substrate (CPSS) were investigated. It was found that the crystal quality of GaN-based LEDs grown on CPSS improved with the decrease of the pattern space (percentage of c-plane). However, when the pattern space decreased to 0.41 μm (S0.41-GaN), the GaN crystallinity dropped. On the other hand, the light output power of GaN-based LEDs was increased with the decrease of the pattern space due to the change of the light extraction efficiency.

Keywords: GaN-based LED; concave patterned sapphire substrate; crystal quality; light output power.