23 August 2017 A two-dimensional analysis on high light extraction efficiency (LEE) LEDs with asymmetric microstructured substrate
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Abstract
This paper presents a quantitative two-dimensional (2D) analysis on high power GaN light emitting diodes (LEDs) fabricated on asymmetric micro-structured substrates. It is found that the light extraction efficiency (LEE) can be substantially improved from conventional symmetric structure to asymmetric structure. The increase of LEE is mainly dedicated to the increased surface area and better randomization on the direction of transmitted/reflected light, which enhances the escaping probability after multiple reflections. This quantitative 2D analysis lays down a solid foundation for the future quantitative 3D analysis.
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Chang-Jiang Chen, Chang-Jiang Chen, Wenbin Zhu, Wenbin Zhu, Ju-Hung Chao, Ju-Hung Chao, Haonan Zhou, Haonan Zhou, Stuart (Shizhuo) Yin, Stuart (Shizhuo) Yin, } "A two-dimensional analysis on high light extraction efficiency (LEE) LEDs with asymmetric microstructured substrate", Proc. SPIE 10382, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XI, 103820F (23 August 2017); doi: 10.1117/12.2276512; https://doi.org/10.1117/12.2276512
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