Chinese Optics Letters, 2008, 6 (10): 788, Published Online: Dec. 4, 2008  

Optimization of top polymer gratings to improve GaN LEDs light transmission

Author Affiliations
1 Electrical Engineering Department, California Polytechnic State University, San Luis Obispo, CA 93407, USA
2 School of Physics and State Key Laboratory for Artif icial Microstructures and Mesoscopic Physics, Peking University, Beijing 100871
3 Electrical Engineering Department, California State University at Long Beach, Long Beach, CA 90840, USA
Abstract
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 \mum, and show that the triangular grating has the best performance. For the triangular grating with 6-\mm period, the LED achieves the highest light transmission at 6-m grating bottom width and 2.9-\mum 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.

Xiaomin Jin, Bei Zhang, Tao Dai, Wei Wei, Xiangning Kang, Guoyi Zhang, Simeon Trieu, Fei Wang. Optimization of top polymer gratings to improve GaN LEDs light transmission[J]. Chinese Optics Letters, 2008, 6(10): 788.

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