Friday, 10 May 2013

Special purpose diodes....!

Optical diodes:
  • LED (Light emitting diodes)
  • Optical diodes
Optical diodes:
LED is a type of semiconductor that emits light when it is forward biased. due to forward bias, electron across the PN junction from N-type material recombine with holes in P type material. the recombining electrons release energy in form of  light & heat.

LED'S are used for:
  • Indicator lamps
  • read out displays on wide variety of instruments.
  • Seven segment display.


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