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

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

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Scopus citations

    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.

    Original languageEnglish (US)
    Title of host publicationPhotonic Fiber and Crystal Devices
    Subtitle of host publicationAdvances in Materials and Innovations in Device Applications X
    EditorsRuyan Guo, Shizhuo Yin
    PublisherSPIE
    ISBN (Electronic)9781510603073
    DOIs
    StatePublished - Jan 1 2016
    EventPhotonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications X - San Diego, United States
    Duration: Aug 28 2016Aug 29 2016

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    Volume9958
    ISSN (Print)0277-786X
    ISSN (Electronic)1996-756X

    Other

    OtherPhotonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications X
    CountryUnited States
    CitySan Diego
    Period8/28/168/29/16

    All Science Journal Classification (ASJC) codes

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Computer Science Applications
    • Applied Mathematics
    • Electrical and Electronic Engineering

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  • Cite this

    Chen, C. J., Chao, J. H., Zhu, W., & Yin, S. (2016). High light extraction efficiency LEDs with asymmetric obtuse angle micro-structured roofs. In R. Guo, & S. Yin (Eds.), Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications X [99580T] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9958). SPIE. https://doi.org/10.1117/12.2239962