Researchers create efficient LEDs from mixed-dimensional perovskites on a fluoride interface

Researchers at The University of Cambridge and Zhejiang University recently created highly efficient LEDs by depositing mixed-dimensional perovskites on a thin lithium fluoride interface. The fabrication method they used reportedly resulted in LEDs with impressive external quantum efficiencies, while also enabling the deposition of perovskites on a material that they are typically incompatible with.

Efficient light-emitting diodes from mixed-dimensional perovskites on a fluoride interface imageImage from Nature Electronics

The researchers have been conducting research into perovskite-based LEDs for a few years now. Back in 2018, they created a near-infrared LED using perovskite-polymer heterostructures that achieved external quantum efficiencies of over 20% and internal quantum efficiencies of almost 100%.

Halide Perovskite Metasurface to aid AR and optoelectronic devices

Researchers from Russia-based ITMO University have created a perovskite-based surface that can turn normal glass into a smart surface. The surface will also be able to convert solar energy into electricity.

"Perovskite films are successfully implemented in LED production. We want to use these films to create surfaces that could be potentially used in AR screens. They have to be transparent enough for users to be comfortable looking through them. At the same time, they have to radiate light to display the necessary information on the screen," explains Sergey Makarov, lead researcher at ITMO's Faculty of Physics and Engineering.

Perovskite QD films get closer to market - Avantama qualifies its green pQD display film

An exciting application for perovskite QDs, which is likely to be the first commercial adoption of pQDs, is for the display market - films that convert blue LED LCD backlight to green.

Switzerland-based nanomaterial developer Avantama told us that the company passed the OEM qualification with its green pQD film, together with a KSF phosphor solution on the LED chip. Avantama expects the first commercial LCD display to adopt this solution to hit the market in 2021.

Researchers address the blue light issue of perovskite-based LEDs

A team of researchers at the Ulsan Institute of Science and Technology (UNIST) and Korea University, led by Professors Myung-Hoon Song, Sang-Gyu Kwak and Han-Young Woo, recently announced the development of a PeLED - a perovskite-based LED device, that emits blue light.

UNIST researchers resolve display blue light problem in PeLEDs image

The team explained that the perovskite light emitting device, which uses perovskite as a color material, is more than three times more efficient than before and has a high color purity, enabling a clear blue color.

New method for synthesizing halide perovskite nanocrystals could create better displays

Researchers at Northwestern University have developed a new method for synthesizing halide perovskite nanocrystals.

Schematic illustration of the synthesis process for the halide perovskite nanocrystal arrays imageThe synthesis process for the halide perovskite nanocrystal arrays. Image from Science Advances

“This method could be used to create optical displays with ‘true’ reds, greens, and blues that completely outshine current LEDs,” said Northwestern’s Chad A. Mirkin. “From color purity to pixel density, these nano-LEDs point toward a potentially dramatic improvement over current LEDs.”