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Area of Science:

  • Optoelectronics
  • Semiconductor Devices
  • Nanotechnology

Background:

  • Ultrasmall micro-light-emitting diodes (μLEDs) below 10 μm are key for next-generation augmented reality (AR) and virtual reality (VR) devices.
  • These devices offer high brightness and low power consumption, enhancing visual experience and device longevity.
  • A significant challenge is the observed decrease in efficiency as μLED size reduces.

Purpose of the Study:

  • To investigate the underlying mechanism of size-dependent efficiency reduction in ion-implanted μLEDs.
  • To analyze the impact of lateral carrier diffusion on the performance of ultrasmall μLEDs.
  • To understand how carrier behavior changes with decreasing μLED dimensions.

Main Methods:

  • Fabrication of ion-implanted μLEDs with diameters of 10, 5, and 2 μm.
  • Electroluminescence analysis using a Gaussian beam telescope to study light intensity profiles.
  • Measurement of spatial carrier distribution and lateral diffusion length at varying current densities.

Main Results:

  • Efficiency was observed to decrease with smaller μLED sizes, consistent with conventional etched μLEDs.
  • Lateral carrier diffusion length was quantified, showing a decrease from 11.2 μm at 1 A/cm² to 2.4 μm at 1000 A/cm².
  • The study confirmed that lateral carrier diffusion is the primary factor causing efficiency roll-off in smaller μLEDs.

Conclusions:

  • Lateral carrier diffusion significantly impacts the efficiency of ultrasmall μLEDs.
  • Understanding and mitigating lateral diffusion is crucial for optimizing μLEDs for AR/VR applications.
  • Ion implantation provides a method to define μLED size without introducing nonradiative recombination centers.