Compare LED and Photo diode

Compare LED and Photo diode 
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1 Answer

Answer :

Parameters
LED (Light Emitting Diode)
Photodiode
Definition
Two terminal device which converts electrical energy into light energy. 
Two Terminal Device which converts light energy into electrical energy.
Working Principle
Works on the principle of Electroluminance.
Works on the principle of Photoconduction.
Semiconductor used 
Gallium Arsenide Phosphide (GaAsP) or Gallium Phosphide (GaP) Germanium and Silicon 
Biasing Mode
Forward Biased Only
Reversed Biased Only
Problem of Leakage Current
No leakage current
Reverse saturation current is significant. Dark current flows when no light rays are incident on it.
Applications
Indicator in AC circuit, Alphanumeric and Numeric display etc.
Switching, high speed counting, ac coupled signaling etc.
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