15 September 2016 High light extraction efficiency LEDs with asymmetric obtuse angle micro-structured roofs
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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.
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Chang-Jiang Chen, Ju-Hung Chao, Wenbin Zhu, 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); doi: 10.1117/12.2239962; https://doi.org/10.1117/12.2239962
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