[13:15 Sat,22.March 2025 by Thomas Richter] |
Chinese researchers have created the smallest LED display ever, with individual pixels less than 100 nanometers in size, only as thin as a human hair. The following image is from this monochrome micro-display: ;) Display made of perovskite LEDs
But the team around Baodan Zhao from Zhejiang and Cambridge University has gone even further and manufactured even smaller LEDs, only 90 nanometers in size as big as a virus too small to be seen even with a strong optical microscope. This corresponds to a record pixel density of 127,000 pixels per inch. This record was made possible by the use of perovskite as the material for the LEDs. The researchers managed to make the perovskite LEDs shine brightly despite the enormous shrinkage. The experiments are a kind of feasibility study to show that LEDs made of perovskite have the potential to produce smaller LEDs than before. So far, digital displays are mostly based on micro-LEDs made of III-V semiconductors. However, their production reaches technical and economic limits with further shrinking sizes, because it becomes too expensive and inefficient. The research team therefore turned to the mineral perovskite, which is already considered a promising, because cheaper, replacement for silicon in solar cells. ;) They gradually produced smaller and smaller perovskite LEDs down to the ones that are only 90 nm in size and found that the new LEDs shine just as brightly as conventional LEDs with the same efficiency and significantly lower costs. Although the perovskite LEDs developed so far are still monochrome, further research should show whether colored perovskite LEDs can also be produced and last as long as conventional LEDs. If this succeeds, they could displace conventional technology and, thanks to the possibility of making them even smaller, also open up new application possibilities. Areas of application for such ultra-small pixels would be, for example, high-resolution augmented reality devices, as displays with such extremely high pixel densities would already overwhelm the human eye. The technology could thus enable a completely new generation of ultra-high-resolution devices. Perovskite is a mineral with the chemical formula CaTiO₃ (calcium titanate). It has a characteristic crystal structure, which is referred to as the "perovskite structure" after the mineral itself. Materials with this structure are currently of particular interest for technological applications, for example as semiconductors in solar cells, which are characterized by high efficiencies, simple manufacturing processes and low costs.  more infos at bei www.nature.comdeutsche Version dieser Seite: Kleinstes LED-Display der Welt - und Pixel so kein wie ein Virus |
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