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World's smallest LED screen: pixels smaller than a virus
Scientists at Zhejiang University have developed the smallest LED with 90 nanometer pixels, smaller than a virus.
World's smallest LED screen: pixels smaller than a virus
Physicists have created the smallest light-emitting diodes (LEDs) ever 1. The image above was displayed on a monochromatic display with pixels that are less than 100 micrometers in size - about the width of a human hair. However, Baodan Zhao of Zhejiang University in Hangzhou, China, and her colleagues were also able to develop an even smaller LED, with pixels measuring just 90 nanometers – the size of a typical virus. These are too small to be resolved by even the most powerful optical microscopes. The results are published today in the journal Nature.
LEDs are semiconductor, which emit light when an electric current flows through them. The researchers created a semiconductor from perovskite, a class of materials that includes not only common minerals from the Earth's mantle, but also those found in advanced solar panels be used. The perovskite allowed the team's LEDs to stay bright even with microscopic pixels. “Aside from our scientific curiosity, such experiments show that the perovskite LEDs can still achieve reasonable efficiencies at extremely small sizes,” explains Zhao. This gives them an advantage over conventional LEDs.
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Lian, Y. et al. Nature https://doi.org/10.1038/s41586-025-08685-w (2025).