Suppression of efficiency-droop effect of InGaN-based LEDs by using localized high indium quantum wells

Yung Chi Yao, Yi Ching Chen, Ya Ju Lee

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

    Abstract

    Staggered quantum wells (QWs) structures are numerically studied to reduce the influence of the efficiency-droop effect on the InGaN-based green light-emitting diode (LED). The location of high In-content InGaN layer in staggered QWs considerably affects the distribution of the electrostatic-field of an LED. When the high In-content InGaN layer is suitably located in the staggered QWs, the localized electrostatic-field with high intensity increases the transport efficiency of injected holes across the active region, improving the overall radiative efficiency of the LED. Most importantly, as accumulation of injected holes in the last QW is relieved, the Auger recombination process is quenched, suppressing the efficiency-droop in the LED. Theoretically, the incorporation of the staggered InGaN QWs in the green LED (λ = 530nm) can ensure an extremely low efficiency droop of 11.3%.

    Original languageEnglish
    Title of host publicationLight-Emitting Diodes
    Subtitle of host publicationMaterials, Devices, and Applications for Solid State Lighting XVI
    DOIs
    Publication statusPublished - 2012 Mar 5
    EventLight-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI - San Francisco, CA, United States
    Duration: 2012 Jan 242012 Jan 26

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    Volume8278
    ISSN (Print)0277-786X

    Other

    OtherLight-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XVI
    Country/TerritoryUnited States
    CitySan Francisco, CA
    Period2012/01/242012/01/26

    Keywords

    • Auger recombination
    • Shockley-Read-Hall
    • efficiency-droop
    • light-emitting diode

    ASJC Scopus subject areas

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

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