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    Bridging “green gap” of LEDs: Giant light output enhancement and directional control of LEDs via embedded nano-void photonic crystals

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    c5nr05555e.pdf
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    Description:
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    Type
    Article
    Authors
    Tsai, Yu-Lin
    Liu, Che-Yu
    Krishnan, Chirenjeevi
    Lin, Da-Wei
    Chu, You-Chen
    Chen, Tzu-Pei
    Shen, Tien-Lin
    Kao, Tsung-Sheng
    Charlton, Martin
    Yu, Peichen
    Lin, Chien-Chung
    Kuo, Hao-Chung
    He, Jr-Hau cc
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    KAUST Solar Center (KSC)
    Date
    2016
    Permanent link to this record
    http://hdl.handle.net/10754/583403
    
    Metadata
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    Abstract
    Green LEDs do not show the same level of performance as their blue and red cousins, greatly hindering the solid-state lighting development, which is so-called “green gap”. In this work, nano-void photonic crystals (NVPCs) were fabricated to embed within the GaN/InGaN green LEDs by using epitaxial lateral overgrowth (ELO) and nano-sphere lithography techniques. The NVPCs act as an efficient scattering back-reflector to outcouple the guided and downward photons, which not only boosting light extraction efficiency of LEDs with an enhancement of 78% but also collimating the view angle of LEDs from 131.5゜to 114.0゜. This could be because the highly scattering nature of NVPCs which reduce the interference giving rise to Fabry-Perot resonance. Moreover, due to the threading dislocation suppression and strain relief by the NVPCs, the internal quantum efficiency was increased by 25% and droop behavior was reduced from 37.4% to 25.9%. The enhancement of light output power can be achieved as high as 151% at a driving current of 350 mA. Giant light output enhancement and directional control via NVPCs points the way towards a promising avenue of solid-state lighting.
    Citation
    Bridging “green gap” of LEDs: Giant light output enhancement and directional control of LEDs via embedded nano-void photonic crystals 2015 Nanoscale
    Publisher
    Royal Society of Chemistry (RSC)
    Journal
    Nanoscale
    DOI
    10.1039/C5NR05555E
    PubMed ID
    26666367
    Additional Links
    http://pubs.rsc.org/en/Content/ArticleLanding/2015/NR/C5NR05555E
    ae974a485f413a2113503eed53cd6c53
    10.1039/C5NR05555E
    Scopus Count
    Collections
    Articles; Electrical and Computer Engineering Program; KAUST Solar Center (KSC); Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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