light-emitting diode
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A light-emitting diode (LED) is a small electronic device made from semiconductor material that produces light when electricity flows through it. LEDs are important because they convert electrical energy directly into light efficiently, making them useful for everything from indicator lights to displays and general lighting.
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Parts of a conventional LED. The flat bottom surfaces of the anvil and post embedded inside the epoxy act as anchors, to prevent the conductors from being forcefully pulled out via mechanical strain or vibration. Close-up of an LED with the voltage being increased and decreased to show a detailed view of its operation Close-up image of a surface-mount LED A bulb-shaped retrofit LED lamp with aluminum heat sink, a light diffusing dome and E27 screw base, using a built-in power supply working on mains voltage
A light-emitting diode (LED) is an electronic component that uses a semiconductor to emit light when current flows through it. Electrons in the semiconductor recombine with electron holes, thereby releasing energy in the form of photons. The color of the light (corresponding to the energy of the photons) is determined by the energy required for electrons to cross the band gap of the semiconductor. White light is obtained by using multiple semiconductors or a layer of light-emitting phosphor on the semiconductor device.