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light-emitting diode |
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light-emitting diodeElectronic component that converts electrical energy into light or infrared radiation in the range of 550 nm (green light) to 1,300 nm (infrared). They are used for displaying symbols in electronic instruments and devices. An LED is a diode made of semiconductor material, such as gallium arsenide phosphide, that glows when electricity is passed through it. The first digital watches and calculators had LED displays, but many later models use liquid-crystal displays. In 1993 chemists at the University of Cambridge, England, developed LEDs from the polymer poly(p-phenylenevinyl) (PPV) that emit as much light as conventional LEDs and in a variety of colours. A new generation of LEDs that can produce light in the mid-infrared range (300–1,000 nm) safely and cheaply were developed by British researchers in 1995, using thin alternating layers of indium arsenide and indium arsenide antimonide. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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lt;p>Created exclusively for LaCie by Neil Poulton, who designs and develops best-selling, award-winning products for a variety of international clients, the unit features a sleek, mirror-polished black finish with blue LED strip on its underside, which hopefully creates an ambient glow and not an distraction. Blue LED lights are extensively used in emergency vehicle lighting. To improve illumination efficiency of warm light in LED lightings, which requires blue LED chips painted with red and green fluorescent powder, the firm invents its production process by adding one red LED chip to its MC LED chip, effectively avoiding red fluorescent powder from harming illumination efficiency. |
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