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Area of Science:

  • Optoelectronics
  • Semiconductor physics

Background:

  • Efficiency droop, a decline in light-emitting diode (LED) brightness at high currents, limits device performance.
  • Current submicrometer LEDs and lasers are restricted to nanowatt output powers due to this phenomenon.

Purpose of the Study:

  • To overcome efficiency droop in light-emitting diodes (LEDs).
  • To achieve linear increases in LED brightness with current.
  • To enhance the output power of microscale optoelectronic devices.

Main Methods:

  • Fabrication of a novel fin p-n junction LED pixel.
  • Characterization of device performance at high current densities.
  • Computational modeling to understand recombination dynamics.

Main Results:

  • The fin p-n junction LED pixel demonstrated elimination of efficiency droop.
  • Devices achieved record current densities of 1000 kA/cm², transitioning to lasing with brightness over 20 μW.
  • Output power exceeded previous micro-LEDs/lasers by 100-1000 times, despite 15% light extraction efficiency.

Conclusions:

  • Spreading of the recombination region in fin LEDs suppresses nonradiative Auger recombination at high injection levels.
  • This design enables a new generation of high-brightness LED and laser pixels.
  • Potential applications range from macroscale to microscale optoelectronics.