High light extraction efficiency LEDs with asymmetric obtuse angle micro-structured roofs

Chang-Jiang Chen; Ju-Hung Chao; Wenbin Zhu; Stuart Yin

doi:10.1117/12.2239962

15 September 2016 High light extraction efficiency LEDs with asymmetric obtuse angle micro-structured roofs

Chang-Jiang Chen, Ju-Hung Chao, Wenbin Zhu, Stuart Yin

Proceedings Volume 9958, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications X; 99580T (2016) https://doi.org/10.1117/12.2239962
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

Abstract

This study reports a high light extraction efficiency (LEE) light emitting diode (LED) by harnessing asymmetric obtuse angle micro-structured roofs. In comparison to conventional symmetric micro-structured roofs, the LEE has been improved from 62% to 73%. This represents an 11% improvement in LEE, which is significant for LED. It is speculated that this improvement is largely due to the increased surface area and better randomization on the direction of transmitted/reflected light, which enhances the escaping probability after multiple reflections.

Citation Download Citation

Chang-Jiang Chen, Ju-Hung Chao, Wenbin Zhu, and Stuart Yin "High light extraction efficiency LEDs with asymmetric obtuse angle micro-structured roofs", Proc. SPIE 9958, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications X, 99580T (15 September 2016); https://doi.org/10.1117/12.2239962

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