What is light-emitting diode?

  • (noun): Diode such that light emitted at a p-n junction is proportional to the bias current; color depends on the material used.
    Synonyms: LED

Light-emitting Diode

A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for other lighting. Appearing as practical electronic components in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible, ultraviolet, and infrared wavelengths, with very high brightness.

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Some articles on light-emitting diode:

H. J. Round - Light-emitting Diode
... In some later experiments with cat's whisker detectors using a variety of substances, he passed current through them and noticed that some gave off light - the first known report of the effect of the light-emitting diode ... Round published his result in 1907 in Electrical World “ To the Editors of Electrical World SIRS – During an investigation of the unsymmetrical passage of current through a contact of carborundum and other substances a curious phenomenon was noted ...
Light-emitting Diode - Applications - Light Sources For Machine Vision Systems
... The size of the illuminated field is usually comparatively small and machine vision systems are often quite expensive, so the cost of the light source is usually a minor concern ... However, it might not be easy to replace a broken light source placed within complex machinery, and here the long service life of LEDs is a benefit ...