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Performance Investigation of AlGaInP Light-Emitting Diodes.

Weiwei Sun1, Shaobo Ge1, Junyan Li1

  • 1Shaanxi Province Key Laboratory of Thin Films Technology and Optical Test, School of Optoelectronic Engineering, Institute for Interdisciplinary and Innovation Research, Xi'an Technological University, Xi'an 710021, China.

Nanomaterials (Basel, Switzerland)
|April 27, 2026
PubMed
Summary
This summary is machine-generated.

Optimizing red Micro-Light emitting diodes (Micro-LEDs) requires matching well-layer strain to device size. Introducing lattice mismatch in quantum wells enhances external quantum efficiency (EQE) in smaller Micro-LEDs, improving performance.

Keywords:
Micro-LED arraysexternal quantum efficiency (EQE)multiple quantum wells (MQWs)well-layer strain

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Semiconductor Physics

Background:

  • Conventional red Micro-Light emitting diodes (Micro-LEDs) suffer from decreased external quantum efficiency (EQE) as chip size reduces.
  • This efficiency drop is linked to sidewall defects and increased non-radiative recombination in smaller devices.

Purpose of the Study:

  • To investigate the impact of well-layer strain in AlGaInP multiple quantum wells (MQWs) on the EQE of red Micro-LEDs across various chip sizes.
  • To determine the optimal relationship between Micro-LED size and MQW material strain for enhanced performance.

Main Methods:

  • Epitaxial growth of AlGaInP MQW wafers with varying indium composition and lattice mismatch using metal-organic chemical vapor deposition (MOCVD).
  • Fabrication of Micro-LED arrays (10-100 μm pixel pitch) using wafer bonding, photolithography, etching, and metal evaporation.
  • Experimental characterization of EQE for Micro-LEDs with different lattice mismatches (0% to 1%) and pixel pitches.

Main Results:

  • Smaller Micro-LED arrays (10 μm pitch) showed significantly higher EQE with increased lattice mismatch (1% strain) compared to lattice-matched devices.
  • Larger Micro-LED arrays (100 μm pitch) performed better with lattice-matched (0% strain) MQW layers.
  • EQE for 10 μm Micro-LEDs with 1% lattice mismatch was ~3x higher than lattice-matched counterparts.

Conclusions:

  • The strain state of MQW materials is a critical factor for maximizing EQE in red Micro-LEDs.
  • Optimal EQE is achieved by matching the Micro-LED chip size with the appropriate well-layer growth strain.
  • Tailoring lattice mismatch in MQWs offers a viable strategy to overcome efficiency roll-off in small-sized Micro-LEDs.