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Developers from China have created innovative PeLED display with a record pixel density (127 thousand PPI) based on perovskite LEDs.
Home The problem of micro-LED displays is the high cost of production processes. Reducing the pixels to about 10 micrometers reduces the efficiency of such a display. In a new study, researchers from Zhejiang and Cambridge Universities have created the world’s smallest LEDs with pixels down to nanoscale using perovskite semiconductors.
Typically, two-component semiconductors based on arsenide and nitride of aluminum, boron, gallium, and indium are used for micro-LEDs. Developers from China decided to replace these materials with perovskite, that have proven to be effective in cells for advanced solar panels.
This allowed the team of scientists to produce perovskite light-emitting diodes (PeLEDs) with dimensions of about 90 nanometers wide. Their small size allowed them to achieve record pixel density in the display, which reached 127 thousand pixels per inch. For example, the Apple Vision Pro headset with a micro-LED display has a pixel width of 7.5 thousand nanometers and a density of 3386 pixels per inch.
Perovskite LEDs have demonstrated higher efficiency than similar micro-LED systems. With pixel sizes ranging from 3.5 to 650 micrometers, their external quantum efficiency ranged from 20%. In comparison, the efficiency of most micro-LEDs based on traditional materials was less than 10%.
The success of the technology was ensured by a new approach to creating a protective relief on the perovskite layers, as traditional laser processing would damage the perovskite material. Therefore, the developers created a lattice on the surface of stronger materials that make up the upper and lower electrical contacts. Thanks to this, the pixels were formed in free spaces in an additional insulating layer, away from the edges of the electrodes.
Currently, the developers are actively cooperating with Hangzhou-based technology company LinkZill to create programmable circuit. Together they created a prototype of an active micro-PeLED dot matrix display that drives the back panel thin-film transistors. The prototype is capable of displaying complex images and video clips.
The results of the study are presented in the journal Nature
Source: NewAtlas; Zhejiang University