Optimization of top polymer gratings to improve GaN LEDs light transmission  

作　　者：Xiaomin Jin 章蓓 代涛 魏伟 康香宁 张国义 Simeon Trieu Fei Wang 

机构地区：[1]Electrical Engineering Department, California Polytechnic State University, San Luis Obispo, CA 93407 USA [2]School of Physics and State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, Peking University, Beijing 100871 [3]Electrical Engineering Department, California State University at Long Beach, Long Beach, CA 90840, USA

出　　处：《Chinese Optics Letters》2008年第10期788-790,共3页中国光学快报（英文版）

基　　金：the Department of the Navy,Office of Naval Research,under Award # N00014-07-1-1152,USA;the"Chunhui"Exchange Research Fellow 2008,Ministry of Education of China,the National"973"Program of China(No.2007CB307004);the National"863"Program of China(No.2006AA03A113);and the National Natural Science Foundation of China(No.60276032,60577030,and 60607003)

摘　　要：We present a grating model of two-dimensional （2D） rigorous coupled wave analysis （RCWA） to study top diffraction gratings on light-emitting diodes （LEDs）. We compare the integrated-transmission of the non-grating, rectangular-grating, and triangular-grating cases for the same grating period of 6 μm, and show that the triangular grating has the best performance. For the triangular grating with 6-μm period, the LED achieves the highest light transmission at 6-μm grating bottom width and 2.9-μm grating depth. Compared with the non-grating case, the optimized light transmission improvement is about 74.6%. The simulation agrees with the experimental data of the thin polymer grating encapsulated flip-chip （FC） GaN-based LEDs for the light extraction improvement.We present a grating model of two-dimensional （2D） rigorous coupled wave analysis （RCWA） to study top diffraction gratings on light-emitting diodes （LEDs）. We compare the integrated-transmission of the non-grating, rectangular-grating, and triangular-grating cases for the same grating period of 6 μm, and show that the triangular grating has the best performance. For the triangular grating with 6-μm period, the LED achieves the highest light transmission at 6-μm grating bottom width and 2.9-μm grating depth. Compared with the non-grating case, the optimized light transmission improvement is about 74.6%. The simulation agrees with the experimental data of the thin polymer grating encapsulated flip-chip （FC） GaN-based LEDs for the light extraction improvement.

关 键 词：ABS resins Gallium alloys Gallium nitride Light emitting diodes Light transmission Optical properties Organic light emitting diodes (OLED) Polymers Semiconducting gallium TRANSPARENCY 

分 类 号：TN312.8[电子电信—物理电子学]