Optical diodes:
- LED (Light emitting 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.
Application:
LED'S are used for:
- Indicator lamps
- read out displays on wide variety of instruments.
- Seven segment display.
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