Light-extraction enhancement and directional emission control of GaN-based LED with transmission grating |
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| Authors: | Suihu Dang Chunxia Li Tianbao Li Wei Jia Peide Han Bingshe Xu |
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| Institution: | 1. Interface Science and Engineering in Advanced Materials of Taiyuan University of Technology, Ministry of Education, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;2. Department of Physics and Electronic & Information Engineering, Yangtze Normal University, Chongqing 408003, China |
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| Abstract: | We theoretically analyze the improvement in light extraction efficiency (LEE) of GaN-based LEDs with transmission grating. Light propagation and extraction was simulated using the finite-difference time-domain (FDTD) method for conical, cylindrical, and hemispherical grating. The simulations show that the use of transmission grating leads to increase in the LEE of GaN-based LEDs. The enhancement in LEE is attributed to the decrease in the Fresnel reflection and the effective increase in the photon escape cone. The maximum LEE enhancement of 2.3 times was achieved by employing hemispherical grating. The directional emission pattern converged by employing conical grating. |
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| Keywords: | Light extraction efficiency Transmission gratings Light-emitting diodes |
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