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Researchers Create Silicon-Based LEDs

Scientists from Karlsruhe Institute of Technology and the University of Toronto report that they have made silicon-based LEDs using silicon nanocrystals that are able to emit various colors of light. These LEDs are free of heavy metals, which means the devices are not toxic. To date, scientists have been able to make silicon-based LEDs that emit only red light. The ability to produce LEDs capable of multicolored displays “is an absolutely novelty,” said Florian Maier-Flaig, a doctoral student at the Karlsruhe School of Optics and Photonics. The new system adjusts the color of light by separating the nanoparticles in the LED based on size, which helps their operational stability. Using multiple sizes of nanoparticles together typically triggers short circuits, but because the devices use a uniform size of nanoparticles, this technique also increases operational life. The researchers published their work in the journal Nano Letters. (PhysOrg)(Karlsruhe Institute of Technology)(Nano Letters)

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