LYCOS RETRIEVER 
Light-Emitting Diode: Semiconductor Device
built 633 days ago
A Light Emitting Diode (LED) is a semiconductor device which converts electricity into light. LED lighting has been around since the 1960s, but is just now beginning to appear in the residential market for space lighting. At first white LEDs were only possible by "rainbow" groups of three LEDs -- red, green, and blue -- by controlling the current to each to yield an overall white light. This changed in 1993 when Nichia created a blue indium gallium chip with a phosphor coating that is used to create the wave shift necessary to emit white light from a single diode. This process is much less expensive for the amount of light generated.
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A light-emitting diode (LED) is a semiconductor device that emits visible light when an electric current passes through it. The light is not particularly bright, but in most LEDs it is monochromatic, occurring at a single wavelength. Compared to other lights, LED has low power requirement, high efficiency, and long life. Color: Red, Green, Amber.
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A light-emitting diode (LED) is a semiconductor device. It is a type of diode that makes one color of light when electrically biased in the forward direction. This effect is a form of electroluminescence. The color of the light depends on the chemical composition of the semiconducting material used, and can be near-ultraviolet, visible or infrared.[1]
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A light-emitting diode (LED) is a semiconductor device that emits visible light when an electric current passes through it. The light is not particularly bright, but in most LEDs it is monochromatic, occurring at a single wavelength. The output from an LED can range from red (at a wavelength of approximately 700 nanometers) to blue-violet (about 400 nanometers). Some LEDs emit infrared (IR) energy (830 nanometers or longer); such a device is known as an infrared-emitting diode (IRED).
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Semiconductor Device