On the 20th, the reporter learned from the Chinese Zhejiang University that Professor David Di and researcher Zhao Baodan’s team from the school of Optoelectronics Science and engineering and international United College of Herning have successfully developed micro-and nano-perovskite leds, the downsizing process causes only slight performance loss. Among them, the smallest size of nano-perovskite LED is only 90 nm, which is the smallest LED pixel reported in public so far. The research was published in the international journal Nature.
“Downscaling” in electronic science refers specifically to the process of reducing the size of basic devices. With the development of information technology, device miniaturization has become the goal of scientists. The world’s most advanced display technology is based on micro light-emitting diode of III-V semiconductors, which can achieve ultra-high-definition and ultra-high-precision Photoelectric Displays, dedavid said. But light-emitting diode are extremely expensive to manufacture because of complex processing techniques, and their efficiency drops dramatically when the pixel size is reduced to about 10 microns or less.
Inspired by the miniaturization of the light-emitting diode of III-V semiconductors, David’s team began developing even smaller perovskite leds for future display technologies, in 2021, the concept of”Micro-perovskite LED” was first proposed and obtained national and international patents. Fabrication of micro-perovskite leds by conventional photolithography destroys the perovskite material.
To do this, the team devised a localized contact process that uses patterned windows created by lithography to keep the pixel area away from the edge of the electrode, enabling the fabrication of perovskite leds with pixel sizes ranging from a few hundred microns to 90 nanometers, at the same time, the luminous efficiency of LED is ensured.
The team’s micro-and nano-perovskite leds only started to show downsizing effects when they were reduced to about 180 nanometres in size, reducing their efficiency to 50 per cent of the maximum. David Dee said the team had collaborated with Hangzhou Lingzhi technology to produce a prototype of an active matrix micron LED microdisplay driven by a TFT backplane, capable of rendering complex images and video. It is reported that micro-and nano-perovskite leds have great potential applications in fields such as AR/VR displays.