The Chinese Academy of Sciences and other university teams jointly developed ultra-high-resolution MicroLED displays

It is reported that Micro LED is emerging as the next generation of display technology for optical communications, augmented reality and virtual reality, and wearable devices. Metal halide perovskites are considered to be ideal candidates for high-brightness LED displays due to their efficient luminescence capability, long-range carrier transport, and scalable fabrication characteristics.

However, there are technical challenges in fabricating perovskite films suitable for Micro LED displays. For example, perovskite films may exhibit uneven light emission, and their surfaces may be unstable during the lithography process. Therefore, solutions are needed to make perovskite films compatible with Micro LED devices.

Recently, a joint research team consisting of the Technical Institute of Physics and Chemistry of the Chinese Academy of Sciences, Jilin University, and the University of Science and Technology of China has made significant progress in overcoming these challenges. The team has developed a novel method for the remote epitaxial growth of continuous crystalline perovskite films. This technology enables the seamless integration of ultra-high-resolution Micro LEDs with pixels of less than 5 μm.

The research results were published in the academic journal Nature Nanotechnology on January 15 under the title "Remote epitaxial crystalline perovskites for ultrahigh.resolution micro-LED displays". In this study, a technique is described to achieve the remote epitaxial growth of continuous crystalline perovskite films over an area of 4 square centimeters using a graphene interlayer. This method effectively eliminates grain boundaries and achieves pure crystal out-of-plane orientation.

Image source: Nature Nanotechnology

Using these single-crystal perovskite free-suspension films, the researchers achieved remarkable results in Micro LEDs, including an EQE electroluminescence efficiency of 16.1%, a brightness of 400,000 nits, and an ultra-high resolution with a pixel size of 4 μm.

This crystal film can be integrated with the electronic back plane to build a Micro LED display with independent dynamic control of each pixel for static image and video display. The research results provide a new technology platform for epitaxial perovskites, which can integrate bright, efficient and uniform light emission with LED electronics to fabricate ultra-high-resolution Micro LED displays with a pixel size of less than 10μm. (LEDinside finishing)