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Flexible GaN-based microscale light-emitting diodes with a batch transfer by wet etching.

Jiangwen Wang, Qilin Hua, Wei Sha

    Optics Letters
    |October 1, 2022
    PubMed
    Summary

    Researchers developed a cost-effective method for fabricating flexible gallium nitride (GaN)-based microscale light-emitting diodes (µLEDs) using wet etching. These flexible µLEDs show improved efficiency, enabling applications in wearables and advanced displays.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Nanotechnology

    Background:

    • Flexible inorganic gallium nitride (GaN)-based microscale light-emitting diodes (µLEDs) are crucial for advanced applications like wearable electronics and human-machine interfaces.
    • Cost-effective manufacturing remains a significant hurdle for the widespread adoption of flexible GaN-based µLEDs.

    Purpose of the Study:

    • To propose a facile and stable fabrication method for array-scale flexible GaN-based µLEDs.
    • To demonstrate the transfer of µLEDs from silicon to flexible substrates while maintaining structural integrity and enhancing performance.

    Main Methods:

    • Fabrication of circular and square µLED arrays (500 µm size and pitch) on silicon substrates using wet etching.
    • Transfer of the fabricated µLED arrays onto a flexible acrylic/copper substrate.

    Main Results:

    • Successful fabrication and transfer of flexible GaN-based µLED arrays.
    • The flexible µLEDs maintained structural integrity after transfer.
    • A significant increase in external quantum efficiency was observed in the as-fabricated flexible µLEDs.

    Conclusions:

    • The developed wet etching and transfer method offers a simple, low-cost approach for producing flexible GaN-based µLEDs.
    • This advancement promotes the use of flexible µLED devices in emerging technologies such as virtual displays, wearables, and curvilinear displays.