Swiss researchers design ultra-pure green paper-thin LEDs

Chemical engineers from ETH Zurich have produced what they believe to be the purest green with an ultra-slim, bendable light-emitting diode. Their research stems from the need for improved colour quality in next generation ultra-high definition displays. Publishing their results in Nano Letters under the title "Ultrapure Green Light-Emitting Diodes Using Two-Dimensional Formamidinium Perovskites: Achieving Recommendation 2020 Color Coordinates", the researchers strived to meet the 2020 standard requirement with an optimized LED device whose color gamut covers 97% and 99% of the Rec. 2020 standard in the CIE 1931 and the CIE 1976 color space, compared to today's TV displays which cover on average only 73 to 78 percent of these color spaces.