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Color tunable inverted pyramid micro-LEDs based on nano-patterned sapphire substrates.

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    Color-tunable micro-LEDs achieve full-color display using 3D inverted pyramids. These devices offer a wide color gamut and high modulation bandwidths, suitable for future internet applications.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Semiconductor Physics

    Background:

    • Micro-scale light-emitting diodes (Micro-LEDs) offer a pathway to simple, low-cost full-color displays.
    • Achieving color tunability and high performance in Micro-LEDs is crucial for advanced display and communication technologies.

    Purpose of the Study:

    • To demonstrate the growth of 3D inverted pyramid Gallium Nitride (GaN) on nano-patterned sapphire substrates (NPSS) for Micro-LED fabrication.
    • To investigate the color-tunability and modulation bandwidth of these Micro-LEDs for potential applications in the Internet of Everything (IoE).

    Main Methods:

    • Growth of 3D inverted pyramid GaN structures on NPSS using a sputtered Aluminum Nitride (AlN) nucleation layer.
    • Epitaxial growth and fabrication of Micro-LED devices (20-100 µm) on the inverted pyramid structures.
    • Electroluminescence (EL) and modulation bandwidth measurements across varying current densities.

    Main Results:

    • Improved uniformity of inverted pyramids using sputtered AlN nucleation layer.
    • Significant color tunability observed, with electroluminescence (EL) wavelength shifting from 660 nm to 470 nm as current increases, covering 97% of the sRGB color gamut.
    • Observation of different modulation bandwidths for polar and semipolar Indium Gallium Nitride (InGaN) multi-quantum-well (MQW) facets, with a highest -3 dB electro-optic bandwidth of 1.28 GHz achieved.

    Conclusions:

    • 3D inverted pyramid GaN Micro-LEDs on NPSS enable wide color-tunable displays.
    • The distinct carrier recombination rates in polar and semipolar InGaN MQW facets influence modulation bandwidths.
    • These Micro-LEDs show promise for integrated display and communication functionalities in the IoE era.