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Related Concept Videos

Zener Diodes01:16

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Related Experiment Video

Updated: Jan 22, 2026

Production and Characterization of Vacuum Deposited Organic Light Emitting Diodes
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Highly efficient GaN-based high-power flip-chip light-emitting diodes.

Shengjun Zhou, Xingtong Liu, Han Yan

    Optics Express
    |June 30, 2019
    PubMed
    Summary

    A novel silver-based reflector significantly enhances light extraction efficiency and current spreading in high-power flip-chip light-emitting diodes (FCLEDs), boosting external quantum efficiency (EQE) by 6.0%. Further improvements are possible with advanced electrode designs.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Semiconductor Devices

    Background:

    • High-power flip-chip light-emitting diodes (FCLEDs) face efficiency limitations due to poor p-type contacts and current crowding.
    • Existing indium-tin oxide (ITO)/distributed Bragg reflector (DBR) structures offer suboptimal performance.

    Purpose of the Study:

    • To improve light extraction efficiency (LEE) and current spreading in FCLEDs.
    • To investigate the efficacy of a novel silver (Ag)-based metallic reflector.

    Main Methods:

    • Fabrication of an Ag-based reflector (Ag film with TiW/Pt multilayers).
    • Characterization of reflector reflectance at 460 nm.
    • Numerical simulations and experimental validation of FCLED performance.
    • Comparison with FCLEDs using ITO/DBR.

    Main Results:

    • The Ag-based reflector achieved 95.0% reflectance at 460 nm.
    • FCLEDs with the Ag-based reflector showed enhanced LEE and current spreading compared to ITO/DBR.
    • External quantum efficiency (EQE) increased by 6.0% at 750 mA injection current.
    • Simulations indicated a potential 5.2% EQE enhancement with 3D via n-electrodes.

    Conclusions:

    • A highly reflective Ag-based metallic reflector effectively improves FCLED performance.
    • This technology offers a pathway to higher-efficiency LED devices.
    • Advanced electrode designs can further optimize current distribution and EQE.