Researchers at the Chemical Engineering Laboratory at the Federal Institute of Technology in Zurich recently invented an ultra-thin flexible LED that emits ultra-pure green light, and researchers use the fine tone to display the three-letter 'ETH. "Research Professor Chih-Jen Shih, Team Leader, is very satisfied with his research breakthrough: "So far, no one has succeeded in producing pure green light like us."
Professor Shih said the research will help power the next generation of ultra-high resolution displays for TVs and smartphones, which must produce ultra pure red, blue and green so the display can produce sharper , Richer details and finer color range adjustment images.Previous technical studies have been able to achieve the purity of the production of red and blue light, however, solid green seems to encounter a technical bottleneck, it is difficult to achieve technological breakthroughs, mainly due to the visual Restrictions: It is hard for the naked eye to tell the difference of green shades compared to the red and blue light, which makes ultra-pure green very complicated in technical production.
Professor Shih also pointed out that they have developed an ultra-thin bendable light-emitting diode that is simple to use and emits pure green light at room temperature.He said: 'Because our LED technology process does not require high temperatures, The simple, low-cost industrial production of ultra-pure green LEDs opens up the opportunity. "The team used perovskites as LED radiation-emitting semiconductor crystals with a perovskite thickness of less than 4.8 nm in LEDs, while LED materials could Made as paper-like flexible, so it can be achieved by the rapid roll-to-roll production process, not only improve production efficiency, while also reducing production costs.
However, this ultra-pure green LED will take some time before it is put into commercial use. The next step for Shih is to improve the efficiency of LED. When the power of the LED is converted to light, the efficiency is only 3%. The market efficiency of electro-optical conversion The value is 5% to 10% .He hopes to improve the efficiency of pure green LED to 6% to 7% .In addition, LED lighting life is about 2 hours, which is far behind the screen on the market, and these It's all where the Shih team needs to improve on this invention.
