December 2, 2013
Prize-nominated German scientists turn to alchemy to develop warm LED light (Deutsche-Welle, 12/02/13)
Posted by Orrin Judd at December 2, 2013 8:54 PM[A] German invention employing a luminescent material that imparts a warm tone to the light may now make LEDs more of a household item.Peter Schmidt, who co-developed the invention in the labs of electronics company Philips, says the material is applied as a thin layer directly over the LED semiconductor."A portion of the blue light passes through this layer," says Schmidt, "but another portion is transformed into green and red light, with the help of this luminescent material."The tone of light from the new LEDs appears to the human eye to be nearly the same as that from a conventional bulb, a halogen lamp or even a candle. But in contrast to these light sources, a LED is far more energy-efficient.
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