“Researchers at Zhejiang University and their collaborators at the University of Cambridge showed that it is possible to make extremely small LEDs based on perovskite semiconductors, reaching a new size limit not achieved before with conventional LEDs. They created micro- and nano-perovskite LEDs (micro/nano-PeLEDs) with characteristic pixel lengths from hundreds of microns down to 90 nanometers. For their green and near-infrared PeLEDs, high external quantum efficiencies of ~20% are maintained across a wide range of pixel lengths (650 to 3.5 microns). Unlike the conventional micro-LEDs based on III-V semiconductors, the micro/nano-PeLEDs exhibit minimum performance reduction upon downsizing. The nano-PeLEDs with pixel lengths of 90 nanometers are the world’s smallest LEDs, enabling a record-high pixel density of 127,000 pixels per inch (PPI) amongst all classes of LED arrays.”

From Zhejiang University.