Researchers at the Chemical Engineering Laboratory at the Federal Institute of Technology in Zurich recently invented an ultra-thin bendable light-emitting diode (LED) that emits ultra-pure green light that will help the next generation of ultra-high resolution displays.
It is worth noting that the electronic screen of the three primary colors is red, green and blue, and the purity of the three colors will affect the display of the display details and fine color range adjustment. Prior art research has made it possible to achieve high-purity displays of red and blue light, whereas solid-green light has been unattainable mainly due to the visual limitations of the human eye. Compared with the red and blue light, the naked eye is difficult to tell the change of green color, which makes ultra-pure green in the technical production has become very complicated.
It is understood that this research mainly made major breakthroughs in materials, methods and research results.
In material selection, indium gallium indium nitride (InGaN) is usually the case, but this material does not have the desirable properties to produce ultra-pure green light, so here researchers use perovskites to replace, of which perovskites are generally Is used to make solar cells, and can efficiently convert electricity into light.
In addition, methodologically, the research team used nanotechnology to develop LEDs, which make the thickness of light-emitting diode perovskite materials less than 4.8 nm, which is an important factor because the color quality depends on the nanocrystals used The thickness and form. In response, the researchers pointed out that thicker or thinner crystal materials will not make it emit pure green light.
Professor Chih-Jen Shih, the research team leader for the results of the study, said no one has so far succeeded in producing pure green light like us.
In addition, the ultrathin light-emitting diode is as paper-like as it is flexible, so existing production processes allow for rapid production, which Shih said will also help future industrial production.
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