The major difference between the photodiode and LED is that, photodiode work on the principal of the photoconduction while LED operates on the principle of electro-luminance. This post gives information about photodiode and LED to know more details about the topic.
Photodiode:
- A photodiode is a light detecting device.
- A photodiode is a two terminal device which can convert light into electrical energy.
- Photodiode work on the principle of photoconduction.
- Photodiode must be used germanium and silicon semiconductor used.
- It works only reverse bias mode.
- A photodiode is used in fiber optic communication, fluxmeter up to a couple, etc.
- Reverse saturation current is significant so dark current flow when no light rays are incident on it.
- Photodiode must be used switching, high-speed counting, AC coupled signaling, etc.
LED :
- LED has a light emitting diode.
- LED is a two terminal device which can convert electrical energy into light energy.
- LED is work on the principle of electro-luminance.
- Gallium Arsenide or Gallium phosphide semiconductor used.
- It works only forward biasing mode.
- LED generated radiated power due to change in temperature.
- LED has no leakage current.
- The LED must be used indicator in AC circuit, Alphanumeric and numeric.
A key difference between photodiode and LED:
- We all know that photodiode is a light detecting device while LED is a light-emitting diode.
- LED and photodiode both are two-terminal devices.
- Photodiode work on reverse biased, LED work on forwarding bias.
- The major difference is that the photodiode works on the principle of photoconduction while in when we are using LED it to work on the electro-luminance.
- Photodiode converts light energy into electrical energy and on the other hand LED converts electrical energy into light.
- A photodiode is made for germanium and silicon semiconductor whereas LED is made for GaAsp or GaP.
- Photodiode provides energy to electron and holes by exposing itself towards light radiation however LED emits photons due to electron-hole recombination.
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