Recently, Lumileds and Eindhoven University of Technology jointly released a major technological achievement. Through innovative cooperation, the two parties successfully used chip-level integrated metasurface technology to greatly improve the light-emitting directionality and efficiency of MicroLED. This technology has shown great potential in the field of LED applications. The relevant research results have been published in the journal Nature - Communications Engineering on April 6.
The core of this technological breakthrough is that the researchers embedded the metasurface composed of nanoscale disks into the p-type contact layer of MicroLED. By stimulating the collective resonance of the emission dipoles in the active region, the light coupling and radiation recombination effects are significantly enhanced, thereby effectively improving the luminous efficiency of the LED. At the same time, the carefully designed nanostructured lattice can accurately control the far-field emission mode of the LED. Experimental data show that while maintaining the same output power, this technology can double the on-axis candela flux.
Toni Lopez, a distinguished scientist at Lumileds R&D, said that in applications such as augmented reality and data communications, the traditional LED Lambertian radiation mode is difficult to efficiently couple with secondary optical devices due to the large beam divergence range, and in strong light environments, it will limit the brightness performance of direct-view displays. "To break through this technical bottleneck, we will turn our attention to the field of nanophotonics."
Lumileds Chief Technology Officer Oleg Shchekin further pointed out that a major advantage of this technology is that it integrates metasurfaces into commonly used composite contact technology, which not only avoids damage to semiconductor materials, but also makes full use of existing mature manufacturing processes. This technology is not only suitable for MicroLED, but may also be widely used in various LED products in the future, and is expected to promote the efficiency of LED products beyond the current most advanced composite contact technology level.
It is reported that Lumileds and Professor Jaime Gomez Rivas' team at Eindhoven University of Technology have established a long-term cooperative relationship. This breakthrough in MicroLED technology is one of the important results of the long-term cooperation between the two parties, demonstrating the powerful power of scientific research cooperation in promoting technological innovation.
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