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Prospects for 100% wall-plug efficient III-nitride LEDs.

Leah Y Kuritzky, Claude Weisbuch, James S Speck

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    |August 19, 2018
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    Summary

    Achieving 100% wall-plug efficiency in III-nitride LEDs is explored. While thermoelectric pumping aids efficiency in smaller bandgap LEDs, it

    Area of Science:

    • Solid State Physics
    • Optoelectronics
    • Materials Science

    Background:

    • Recent studies show mid-infrared LEDs can exceed 100% wall-plug efficiency (WPE) via thermoelectric pumping.
    • This phenomenon, driven by lattice heat, is less pronounced in wider bandgap materials like III-nitrides.
    • III-nitride LEDs are crucial for visible light applications but face efficiency challenges.

    Purpose of the Study:

    • To investigate the potential for achieving 100% or greater WPE in III-nitride LEDs.
    • To assess the performance of current III-nitride devices under relevant operating conditions.
    • To identify requirements and prospects for high-efficiency III-nitride LED operation.

    Main Methods:

    • Evaluation of electrical and optical performance of state-of-the-art III-nitride LED devices.

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  • Analysis of the impact of thermoelectric effects on WPE in wider bandgap semiconductors.
  • Theoretical assessment of conditions necessary for ultra-high efficiency operation.

    • Main Results:

    • Thermoelectric pumping effect is weaker in III-nitrides compared to mid-IR LEDs.
    • Current III-nitride devices show performance limitations for achieving ultra-high WPE.
    • Specific requirements for approaching 100% WPE at high current densities are outlined.

    Conclusions:

    • Achieving 100% WPE in III-nitride LEDs requires overcoming weaker thermoelectric effects.
    • Further advancements in device design and material properties are necessary.
    • Prospects for ultra-high efficiency III-nitride LEDs are discussed in relation to current densities.