Q.9 What is a Light Emitting Diode? Draw its circuit symbol.
Best answer
Answer: A Light Emitting Diode (LED) is a heavily doped p-n junction diode which emits light when it is forward biased.
When forward biased, electrons from the n-region and holes from the p-region cross the junction and recombine. In materials like GaAs, GaAsP or GaN the energy released in recombination is emitted as photons of light (energy about equal to the band gap). The colour of light depends on the semiconductor material used.
Circuit symbol: [Symbol: the ordinary diode symbol, a triangle (anode, p-side) pointing towards a vertical bar (cathode, n-side), enclosed in a circle, with two small arrows pointing outwards away from the diode, showing emitted light.]
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