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.
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”.
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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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