Published in ‘Nature Communications Materials’, Paper Details
Creation of Record-Setting Red Emission from InGaN Quantum Wells
Creation of Record-Setting Red Emission from InGaN Quantum Wells
GRENOBLE, France – Sept. 16, 2025 – CEA-Leti and the Centre for Research on Heteroepitaxy and its Applications (CRHEA) today announced R&D results that have cleared a path toward full-color microdisplays based on a single material system, a long-standing goal for augmented and virtual reality (AR/VR) technologies.
The project, presented in a paper published in Nature Communications Materials, developed a technique for growing high-quality InGaN-based quantum wells on sub-micron nanopyramids, enabling native emission of red, green, and blue (RGB) light from a single material system. Titled “Regular Red-Green-Blue InGaN Quantum Wells With In Content Up To 40% Grown on InGaN Nanopyramids”, the paper will be presented at the MicroLED Connect Conference on Sept. 24, in Eindhoven, the Netherlands.
Microdisplays for immersive devices require bright RGB sub-pixels smaller than 10 × 10 microns. According to the paper, “the use of III-nitride materials promises high efficiency micro-light emitting diodes (micro-LEDs) compared to their organic counterparts. However, for such a pixel size, the pick and place process is no longer suitable for combining blue and green micro-LEDs from III-nitrides and red micro-LEDs from phosphide materials on the same platform.” Red-emitting phosphide micro-LEDs also suffer from efficiency losses at small sizes, while color conversion methods face challenges in deposition precision and stability.
Implications for AR/VR Displays
This breakthrough enables native RGB emission from a single material system, simplifying integration and improving performance in future microdisplays. Because the nanopyramid structures can be patterned at sub-micron scale, they are well suited for the <10 micron pixel pitch demanded by AR/VR headsets, smart glasses, and other immersive devices. In the longer term, full color micro-display for AR/VR, fast optical communications (emission + reception), and beyond that: photovoltaic applications, renewable hydrogen production.
The team grew InGaN nanopyramids using metal organic vapor phase epitaxy (MOVPE) with an epitaxial graphene layer on silicon carbide serving as a selective mask.
“Using these nanostructures relieved the internal strain that usually limits indium incorporation,” said lead author Amélie Dussaigne of CEA-Leti. “As a result, we achieved record indium nitride mole fractions of 40 percent in the quantum wells—high enough to generate red light reliably without degrading crystal quality.”
“This new technology addresses one of the most difficult bottlenecks in display miniaturization,” said Adrien Michon, a research scientist in the project with the CRHEA. “It opens the door to manufacturing full-color microdisplays with unmatched brightness and resolution—critical for next-generation AR and VR.”
CRHEA is a French National Centre for Scientific Research (CNRS) and Université Côte d’Azur research laboratory specializing in the study of materials.
Very regular InGaN based quantum wells on the nanopyramid sidewals
High In content, 42% and up to 45% - Homogeneous red emission
Photo credit: CEA-Leti
About CEA-Leti (France)
CEA-Leti, a technology research institute at CEA, is a global leader in miniaturization technologies enabling smart, energy-efficient and secure solutions for industry. Founded in 1967, CEA-Leti pioneers micro-& nanotechnologies, tailoring differentiating applicative solutions for global companies, SMEs and startups. CEA-Leti tackles critical challenges in healthcare, energy and digital migration. From sensors to data processing and computing solutions, CEA-Leti’s multidisciplinary teams deliver solid expertise, leveraging world-class pre-industrialization facilities. With a staff of more than 2,000 talents, a portfolio of 3,200 patents, 11,000 sq. meters of cleanroom space and a clear IP policy, the institute is based in Grenoble (France) and has offices in San Francisco (United States), Brussels (Belgium), Tokyo (Japan), Seoul (South Korea) and Taipei (Taiwan). CEA-Leti has launched 80 startups and is a member of the Carnot Institutes network. Follow us on www.leti-cea.com and @CEA_Leti.
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CEA has a key role in transferring scientific knowledge and innovation from research to industry. This high-level technological research is carried out in particular in electronic and integrated systems, from microscale to nanoscale. It has a wide range of industrial applications in the fields of transport, health, safety and telecommunications, contributing to the creation of high-quality and competitive products.
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