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Researchers in Japan have developed pure-blue organic light-emitting diodes (OLEDs) with high efficiency and long lifetimes. They say that this blue light source matches the excellent performance of red and green OLEDs, overcoming one of the major hurdles hindering the development of OLED displays. The team achieved this by stacking two novel emitter molecules on top of each other and splitting the energy conversion and emission processes between them.

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