Micro-LEDs for super-efficient displays

Important results from the project

In the project, the goal is to develop a new type of LEDs, micro-LEDs, which generate an efficient emission not only in the blue area, but also in the green and later also in the red area. These micro-LEDs, based on quantum structures of nitride semiconductors, should be made microscopically small, down to sub-um size, and have a high efficiency. There are many applications based on such micro-LEDs with bright emission in the red-green-blue (RGB) range, such as micro-LEDs in high-resolution displays and white light sources for lighting based on mixed RGB-LEDar.

Expected long term effects

In the project, pyramidal GaN structures, microscopically small, down to the sub-um range, have been fabricated with epitaxial growth in our unique hot-wall reactor. These pyramids have been covered with InGaN quantum wells on the facets and InGaN quantum dots on the top of the pyramids. An efficient emission, from both quantum wells and quantum dots, is demonstrated in different spectral ranges. Our pyramidal concept has a great potential to reach longer wavelengths, the green and red area with a maintained high efficiency, as one needs to increase the In content in the InGaN structure.

Approach and implementation

After many years of research and development, the pyramid concept has been able to enter a commercialization phase. Polar Light has hired two final-year students on the Y program as employees for this phase. One has participated in a LEAD incubator program in Mjärdevi Science Park, which has been very rewarding and resulted in an essential contact with a potential customer, a large company. To construct pixel arrays as a part of an entirely new display application with specific performance, collaborations with universities in Japan and Taiwan as well as RISE in Lund have been initiated.

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Polar Light Tech is developing a new generation of light technology for interconnects, displays, quantum cryptology