Communications
Revolution 		Communications
Networks 		Optical
Fibres 		Photonic
Devices 		Future of
Communications 		Credits

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What is a LED?
A light-emitting diode is a p-n junction that emits light when forward-biased:
  • one side of the diode is a semiconductor of type p (majority carriers are holes)
  • the other side is of type n (majority carriers are electrons) 
    •
    Forward bias means that:
  • a positive bias is applied on the p side of the diode
  • a negative bias is applied on the n side of the diode 
    •
    Click here for a quick introduction to doping: type n and p semiconductors

    Click here for a quick introduction to p-n junction
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