UC Santa Barbara Engineers Boost Red MicroLED Efficiency
Researchers achieve 20.8% external quantum efficiency using gallium nitride at high temperatures.
Updated on Oct. 24, 2026 in Materials Science
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Engineers at UC Santa Barbara announced on October 7, 2026, that they reached a 20.8% external quantum efficiency with red microLEDs. Published in the journal ACS Photonics, this development marks a significant shift in producing red light from gallium nitride.
Why it matters
This breakthrough addresses long-standing difficulties in efficiently producing red light from gallium nitride, potentially enabling full-color displays and energy-efficient data center interconnects using a single material.
The devices feature a 619-nanometer emission wavelength and maintain over 74% of room-temperature light output at 200 degrees Celsius. The engineering team achieved these metrics using epitaxial growth of crystalline layers and a ring-shaped distributed Bragg reflector.
The players
UC Santa Barbara
This public research university in Santa Barbara serves as a leading center for advanced materials science and semiconductor engineering.
The details
The material development relies on epitaxial growth of thin crystalline semiconductor layers to stabilize performance. A specialized ring-shaped distributed Bragg reflector was integrated into the design to effectively redirect light out of the device.
Timeline
October 7, 2026: Results were published in the journal ACS Photonics.
The Big Picture
This development extends the capabilities of the Gallium Nitride semiconductor material platform by enabling efficient red light emission, which was previously a critical barrier for single-material full-color displays.
The transition to gallium nitride-based full-color displays could result in more energy-efficient consumer electronics and brighter, more durable screens. Additionally, improved optical interconnects may eventually lead to faster data transmission speeds within modern computing infrastructure.
The takeaway
This achievement demonstrates that gallium nitride can overcome traditional temperature and efficiency limitations for red light emission. Consumers may eventually benefit from smaller, more power-efficient display technologies as this semiconductor process scales toward commercial use.
Further reading
For more information on current developments in the field, explore the Materials Science section.
Source note: This article includes information reported by Edhat Santa Barbara.
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