Is a light-emitting diode a semiconductor?
Release time
2022-11-28
Light-emitting diode is also known as LED. it uses a fixed semiconductor chip as the light-emitting material, so it is a semiconductor. Light-emitting diodes are relatively more environmentally friendly and energy efficient than traditional lamps and lanterns, with high color rendering. Semiconductor light-emitting diodes have a simple structure, small size, small operating current, easy to use, low cost, so the application in the photoelectric system is extremely common. In the forward bias, the semiconductor PN junction or its similar structure can emit visible or near-infrared light, this direct conversion of electrical energy into light energy devices called light-emitting diodes, referred to as LEDs. light-emitting is the internal energy stored in some way inside the object into the process of light radiation. Light-emitting objects light radiation is generated when electrons excited in the material leap to the ground state. Semiconductor (mainly the periodic table of elements in group III and V elements constitute the compound semiconductor) light-emitting diodes belong to the current excitation of electroluminescent devices. Electroluminescence phenomenon was discovered in 1923, when it did not attract attention. With the development of modern technology, the light-emitting devices put forward new requirements, hope that the light-emitting tube simple, reliable, long life, low price, miniaturization. So since the 1960s the research of electroluminescence is very active. The material used at the time was GaAsP, red light (λp = wavelength 650nm), in the drive current of 20mA, the luminous flux of only a few thousandths of a lumen, the corresponding light visual efficiency of about 0.1 lumen / watt.
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