Ultra-low-current driven InGaN blue micro light-emitting diodes for electrically efficient and self-heating relaxed
Woo Jin Baek1, Juhyuk Park1, Joonsup Shim1
1School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea.
Nature Communications
|March 18, 2023
Summary
We optimized indium gallium nitride (InGaN) micro-light-emitting diodes (LEDs) for displays by engineering epitaxial structures. This reduces efficiency loss in small pixels, improving power consumption and thermal management.
Area of Science:
- Semiconductor physics
- Materials science
- Optoelectronics
Background:
- Indium gallium nitride (InGaN) micro-light-emitting diodes (LEDs) are key for advanced displays.
- Efficiency degradation in small pixels increases display power consumption.
Purpose of the Study:
- To engineer epitaxial structures for InGaN micro-LEDs to mitigate efficiency loss.
- To enhance performance in low current injection regimes for small-sized pixels.
Main Methods:
- Epitaxial structure engineering focusing on quantum barrier and electron blocking layers.
- Reducing lateral carrier diffusion and electron tunneling rates.
- Achieving balanced carrier injection.
Main Results:
- High external quantum efficiency (EQE) of 3.00% at 0.1 A/cm² for 10 × 10 μm² pixels.
- Negligible Jmax EQE shift during pixel size reduction, overcoming sidewall recombination challenges.
- Effective reduction in micro-LED self-heating and average pixel temperature.
Conclusions:
- Epitaxial structure optimization significantly improves InGaN micro-LED efficiency and stability.
- The developed strategies address critical challenges in micro-display technology.
- Reduced self-heating offers further advantages for display performance and longevity.
