Filiform of LED are Light-emitting Diode.
When a conduction electron makes a transition to the valence band to fill up a hole in a p-n junction, the extra may be emitted as a photon. If the wavelength of this photon is in the visible range (380mm - 780mm), one can see the emitted light. Such a p-n junction is known as light-emitting diode abbreviated as LED. For silicon or germanium, the wavelength falls in the infrared region. LEDs may be made from semiconducting compounds like gallium such as, arsenide of indium phosphide. LEDs are very commonly used in electronic gadgets as indicator lights.
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