Electrons from the Pm-147 make the phosphor glow, and its light is turned into electricity by a photoelectric surface of silicon on each side of the plastic wafer.
It consists of a sheet of "electroluminescent" phosphor that glows when it is excited by an electrical voltage.
Inside is a layer of phosphor that when hit with an alternating current, shines bright white (not bluish like other electroluminescent light).
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Mike Simpson in guardian.co.uk Instead of producing one phosphor that produced white light, we took three - green, red and blue - and mixed them to get white,explains Mike Simpson, technical and design director of Philips Lighting. "One of the spin-offs was that these...