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Light-Emitting Diode
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The LED (Light-Emitting Diode) is a light source that differs in important ways from existing light sources. LEDs produce more light per watt than do incandescent bulbs. LEDs can emit light of an intended color without the use of color filters, which is more efficient. LEDs ... have an extremely long life span. LED lights are one of the most energy efficient green products available.
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Light-Emitting Diode -- A semiconductor diode, made from certain materials (e.g. Gallium Arsenide), in which light is emitted in response to the forward-bias current. The light results from the recombination of electrons and positive holes, with a transition to a lower energy state. see ... Diode [DC99]
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A solid state component that uses a light-emitting diode to transmit light through an optically transparent barrier between two isolated circuits. This barrier insulates circuits by allowing light to pass through, but not current.
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A light-emitting diode (LED) is a semiconductor device that emits incoherent narrow-spectrum light when electrically biased in the forward direction. This effect is a form of electroluminescence. The color of the emitted light depends on the chemical composition of the semiconducting material used, and can be near-ultraviolet, visible or infrared. Nick Holonyak Jr. (born 1928) of the University of Illinois at Urbana-Champaign developed the first practical visible-spectrum LED in 1962.[1]
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Like a normal diode, the LED consists of a chip of semiconducting material impregnated, or doped, with impurities to create a p-n junction. As in other diodes, current flows easily from the p-side, or anode, to the n-side, or cathode, but not in the reverse direction. Charge-carriers—electrons and holes—flow into the junction from electrodes with different voltages. When an electron meets a hole, it falls into a lower energy level, and releases energy in the form of a photon.
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The light-emitting diode (LED) is a new light source that differs in important ways from existing light sources. This section covers the basics on how LEDs work, some important terms to know, and the common shapes and sizes of LEDs currently on the market. Click on the links below for more information.
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Light-Emitting Diode