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Related Experiment Video

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Electrically Driven Sub-Micrometer Light-Emitting Diode Arrays Using Maskless and Etching-Free Pixelation.

Ji-Hwan Moon1, Baul Kim1, Minho Choi1

  • 1Department of Physics and KI for the NanoCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.

Advanced Materials (Deerfield Beach, Fla.)
|January 21, 2023
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Summary
This summary is machine-generated.

Researchers developed a maskless, etching-free method using focused ion beam (FIB) irradiation to create sub-micrometer micro-light-emitting diode (µLED) pixel arrays. This technique enables high-density displays by inducing optical quenching and electrical isolation without damaging the surface.

Keywords:
electrically driven devicesfocused ion beamsluminescence quenching and electrical isolationmaskless and etching-free pixelationsub-micrometer light-emitting diodes

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • Group-III-nitride-based light-emitting diodes (LEDs) offer high efficiency, brightness, and stability, making them promising for future displays.
  • Current pixelation methods limit the realization of high pixel density displays.

Purpose of the Study:

  • To develop a novel, maskless, and etching-free micro-LED (µLED) pixelation method.
  • To demonstrate electrically driven sub-micrometer-scale µLED pixel arrays.
  • To investigate the effects of focused ion beam (FIB) irradiation on µLEDs.

Main Methods:

  • Tailored Helium (He) focused ion beam (FIB) irradiation was employed for maskless and etching-free µLED pixelation.
  • Specific ion doses (approximately 10^14 ions cm^-2) were applied to induce simultaneous optical quenching and electrical isolation.
  • Sub-micrometer scale µLED pixel arrays (0.5 µm side length) were fabricated and characterized.

Main Results:

  • Electrically driven sub-micrometer µLED pixel arrays were successfully demonstrated.
  • Optical quenching and electrical isolation effects were confirmed at a specific ion dose without causing surface damage.
  • Highly efficient µLED pixel arrays at the sub-micrometer scale were fabricated and verified through cathodoluminescence, photoluminescence, and electroluminescence.

Conclusions:

  • The FIB-induced optical quenching and electrical isolation method offers a viable solution for µLED pixelation.
  • This technique can pioneer new defect engineering strategies for fabricating sub-micrometer optoelectronic devices.
  • The developed method is crucial for advancing high pixel density display technologies.