Displays - Page 6

UK-based Quantum Solutions published this video below that demonstrates its latest perovskite QD film for LCD color conversion:

Quantum Solutions now offers its QDot SharpGreen Perovskite QDs Film, which is a polymer composite with embedded QDot SharpGreen Perovskite QDs. It is designed to be used in LCD backlighting units and sensor devices for X-rays and UV lights. The material has green emission 520-535 nm (depending on the concentration), high PLQY (up to 80-100 %) and narrow FWHM ( 70-80 % of initial photoluminescence within 1000 hours of exposing by heat (85 °C and blue light 10 mW/cm² exposure) and high relative humidity (90 % RH at 60 °C).

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.

Image 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%.

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.

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.

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.

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.

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

The 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.'

Research using the Canadian Light Source (CLS) at the University of Saskatchewan could help bring perovskite QDs display technology closer to commercilization.

Quantum dots are nanocrystals that glow, a property that scientists have been working with to develop next-generation LEDs. When a quantum dot glows, it creates very pure light in a precise wavelength of red, blue or green. Conventional LEDs, found in TV screens today, produce white light that is filtered to achieve desired colors, a process that leads to less bright and muddier colors.

Singapore-based Nanolumi unveiled several display prototypes that adopt the company's perovskite quantum dots films.

In the video above, you can see a 32" mini-LED display, a 24" edge-lit LCD monitor and a 10-inch tablet. The company says its cadmium-free films combine the industry's narrowest color spectrum.

Helio Display Materials, based in the UK, was spun-off from both Oxford and Cambridge University, to commercialize photoluminescent and electroluminescent perovskite-based materials for the display industry.

Following is an interview with Helio's CEO, Simon B. Jones, discussing the company's technology and business.

Florida State University (FSU) researchers have discovered a novel structure for metal halide perovskite materials that shows potential for more efficient technologies.

Professor of Chemistry and Biochemistry Biwu Ma and his team's new study explains how they created a hollow nanostructure for metal halide perovskites that would allow the material to emit a highly efficient blue light.