单词	light-emitting diode
释义	light-emitting diode(LED) A semiconductor device that converts electrical energy into light or infrared radiation in the range 550 nm (green light) to 1300 nm (infrared radiation). The most commonly used LED (see illustration) emits red light and consists of gallium arsenide-phosphide on a gallium arsenide substrate, light being emitted at a p-n junction, when electrons and holes recombine (see recombination process). LEDs are extensively used for displaying letters and numbers in digital instruments in which a self-luminous display is required. Light-emitting diode
随便看	Bunsen cell Bunsen, Robert Wilhelm buoyancy bus busbar butterfly effect BWR bypass capacitor byte Bénard cell c.g.s. units cadmium cell caesium clock Cahn-Hilliard model calculus californium caloric theory calorie Calorie calorific value calorimeter calx camera Canada balsam canal rays

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