The researchers first successfully developed ultra pure green LED, ultra high definition screen is expected to break through

Zurich Federal Institute of chemical engineering laboratory researchers recently invented a thin light emitting diode (LED), bending it emits ultra pure green light, the researchers used the fine tone display three letters "ETH". The research team leader Chih-Jen Shih professor is very pleased with his research breakthrough: "so far, no one can successfully produce like us pure green."

Professor Shih pointed out that the production of ultra high resolution display for TV and intelligent mobile phone of the study will help the next generation. The screen of electronic equipment must be able to produce ultra pure red, blue and green light, so that the display can produce more clear and more abundant details and more precise color image range adjustment. Previous study has technology can realize the red and blue light green color purity production, however, seems to have encountered technical bottlenecks, it is difficult to achieve technological breakthroughs, the main reason is that by visual restrictions. Compared to the red and blue light, the naked eye is difficult to distinguish the changing shades of green, which makes the ultra pure green in technology becomes very complicated.

Professor Shih also pointed out that they have developed a thin light emitting diode can be bent, can use simple at room temperature in a pure green. He said: "because of our LED process without high temperature, simple and low cost of the light emitting diode for future ultra pure green industrial production opens up opportunities." The research team used perovskite as semiconductor crystal LED radiation light, in LED perovskite material thickness less than 4.8 nm. The LED material can be made of paper like flexible imaging, so as to achieve the rapid roll production process, not only improve the production efficiency, but also reduce the cost of production.

But the pure green light-emitting LED also needs some time in industry application. Shih the next step is to improve the efficiency of LED, the power of LED into the light efficiency is only 3%, the market of the TV screen electro-optic conversion efficiency value is 5% to 10%. He hopes to improve the efficiency of pure green LED to 6% to 7%. In addition, LED illuminate life at about 2 hours, and the screen on the market compared to the large gap, and these are the Shih team needs to be improved to the invention of the place.

Source: Wei Feng Network

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