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영어로 읽는 과학기사 KAIST said on January 25 that a research team led by Prof. Yang Min-yang from its mechanical engineering department had developed a technology that allows for the efficient production of OLEDs in atmosphere.
The technology developed by Prof. Yang was devised to allow for the production in liquid form of all functional layers (electron hole injection layer, light emitting layer, electron transport layer, and electron injection layer) in OELDs, excluding metallic electrodes such as anodes and cathodes. Since this liquid can be applied to solution processes such as printing technology, it will likely become possible to produce OLEDs at low cost.
Notably, alkaline and alkaline earth metal materials, which constitute electron injection layers of conventional OLEDs, are unstable in the atmosphere. But the new process, which the research team obtained by using a 5nm zinc oxide nanoparticle solution and ammonium ion solution, does not contain alkali and alkaline earth at all, and is thus stable in atmosphere.
Using the new technology, the research team has thus realized high-performance lighting of 10cd/A of light emitting efficiency, and 50,000 cd/ in luminance.
The study was published in the December 14, 2010 issue of 'Applied Physics Letters' an authoritative scientific journal. Meanwhile, the application process for domestic and overseas patents has already been completed.
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저작권자 2011.02.08 ⓒ ScienceTimes
