New perovskite growth method enables ultra-high resolution micro-LED displays

Remotely epitaxial crystalline perovskites for ultra-high resolution micro-LED displays. Credit: Professor Wu Yuchen’s group
Microscale light-emitting diodes (micro-LEDs) are emerging as the next generation display technology for optical communications, augmented and virtual reality, and wearable devices. Metal halide perovskites show great potential for efficient light emission, long-range carrier transport, and scalable fabrication, and could be ideal candidates for bright LED displays.
However, the fabrication of thin-film perovskites suitable for micro-LED displays faces serious challenges. For example, thin film perovskites can exhibit non-uniform emission and their surfaces can become unstable when subjected to lithography. For these reasons, solutions are needed to make thin-film perovskites compatible with micro-LED devices.
Recently, a team of Chinese researchers led by Professor Wu Yucheng of the Institute of Physical and Chemical Technology, Chinese Academy of Sciences, has made significant progress in overcoming these challenges. A research team has developed a new method for the remote epitaxial growth of continuous-crystal perovskite thin films. This advancement enables seamless integration into ultra-high resolution micro-LEDs with pixels less than 5 μm.
Their findings, published January 15 in the journal Nature Nanotechnology, describe a remote epitaxial growth technique that utilizes a graphene interlayer to create continuous crystalline perovskite thin films over an area of ​​4 cm2. This method effectively removes grain boundaries and achieves pure out-of-plane crystal orientation.
Using these single-crystal free-standing perovskite thin films, researchers have demonstrated remarkable results for micro-LEDs, including electroluminescence efficiency of 16.1%, brightness of 4 × 105 cd m-2, and ultra-high resolution at a pixel size of 4 μm. achieved great results.
Freestanding perovskites can be easily integrated with commercially available electronic platforms, allowing independent dynamic control of each pixel. This feature is applicable to both still image and video displays.
This method makes it possible to build full-color micro-LED displays by integrating multiple perovskite components. Additionally, perovskite films can be monolithically integrated with nanophotonic structures such as resonant metasurfaces and photonic crystals, paving the way for the development of ultrasmall photonic devices.
More information: Meng Yuan et al. Remote epitaxial crystalline perovskites for ultra-high resolution micro-LED displays, Nature Nanotechnology (2025). DOI: 10.1038/s41565-024-01841-9
Provided by Chinese Academy of Sciences
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