Researchers at the Chemical Engineering Laboratory at the Federal Institute of Technology in Zurich have recently invented an ultra-thin, flexible light-emitting diode (LED) that emits ultra-pure green light. The researchers used this fine tone to display the three letters "ETH". ". Professor Chih-Jen Shih, the head of the research team, is very satisfied with his research breakthrough: "So far, no one has succeeded in producing pure green light like ours."
Professor Shih pointed out that the research will help the next generation of ultra-high-resolution displays for televisions and smartphones. Electronic device screens must be capable of producing ultra-pure red, blue, and green light to allow the display to produce sharper, richer detail and finer color range adjustment images. Previous technical research has already achieved the purity production of red and blue light. However, solid color green light seems to encounter technical bottlenecks, and it is difficult to achieve technological breakthroughs. The main reason is that it is limited by vision. Compared to red and blue light, it is difficult for the naked eye to distinguish the change in green color, which makes ultra-pure green very complicated in technical production.
Professor Shih also pointed out that they have developed an ultra-thin, flexible LED 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, this opens up opportunities for simple, low-cost industrial production of ultra-pure green LEDs in the future." The research team used perovskites as semiconductor crystals for LED radiation. The thickness of the perovskite material in the LED is less than 4.8 nm. The LED material can be bent like the image forming paper, so that the roll-to-roll process can be quickly produced, which not only improves the production efficiency, but also reduces the production cost.
However, this ultra-pure green LED will take some time before it can be put into industrial applications. Shih's next step is to improve the efficiency of the LED. The power of the LED is only 3% when converted to light, and the TV screen's electro-optical conversion efficiency is 5% to 10%. He hopes to increase the efficiency of pure green LEDs to 6% to 7%. In addition, the LED's illumination life is currently about 2 hours, which is a big difference from the screen on the market, and these are the areas where the Shih team needs to improve the invention.
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