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Question
Distinguish between light-emitting diode and photo-diode.
Distinguish Between
Solution
| LED | Photo-diode | ||
| (1) | It is a pn-junction diode with a forward bias. | (1) | It is a reverse biassed pn -pn-junction diode with a unique purpose. |
| (2) | It produces light as a result of direct radioactive recombination of surplus electron-hole pairs. | (2) | In response to photons and high-energy particles, it creates charge carriers. |
| (3) | The intensity of the emitted light is proportional to the forward current of the diode. | (3) | The photocurrent in the external circuit is proportional to the incident radiation intensity. |
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Special Purpose Junction Diodes
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