Difference between LED and Photodiode

LED stands for Light Emitting Diode and Photodiode is a type of photo detector that converts light into electric current.

The Main difference is LED is a source of light while photodiode is a light sensor.

Before we move to the differences, let’s understand what are LED and Photodiode:

  • LED: A LED is a semiconductor device that emits light when an electric current is passed through it.
  • Photodiode: A Photodiode is a semiconductor device that converts light into an electric current.

LED vs Photodiode

Now, let’s move to LED vs Photodiode:

Major differences between LED and Photodiode

LED Photodiode
LED emits light. Photodiode detects light.
LED is used for illumination. Photodiode is used for sensing.
LED have a longer lifespan. Photodiode have a shorter lifespan.
LED have a lower sensitivity. Photodiode have a high sensitivity.
LED have a lower response time. Photodiode have a fast response time.


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That’s it.

Note that sometimes, the question might also be asked as “distinguish between LED and Photodiode”.

Also see:

Final words

LED and Photodiode are two different devices, LED is a source of light and Photodiode is a light sensor. LED have a longer lifespan, lower sensitivity, lower response time and lower cost than Photodiode. Photodiode have a short lifespan, high sensitivity, fast response time and higher cost than LED.

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09/26/2023 11:08 am GMT


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