Optimization of top polymer gratings to improve GaN LEDs light transmission

Xiaomin Jin; Bei Zhang; Tao Dai; Wei Wei; Xiangning Kang; Guoyi Zhang; Simeon Trieu; Fei Wang

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

Optimization of top polymer gratings to improve GaN LEDs light transmission

论文大纲

Xiaomin Jin ^1,2,*Bei Zhang ²Tao Dai ²Wei Wei ²Xiangning Kang ²Guoyi Zhang ²Simeon Trieu ¹Fei Wang ³

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

氮化镓激光二极管衍射光栅 140.0140 Lasers and laser optics 140.5960 Semiconductor lasers 050.1950 Diffraction gratings

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.

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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.

Optimization of top polymer gratings to improve GaN LEDs light transmission

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