Question:
n: Light emitting diode $(LED)$ emits spontaneous radiation.
: $LED$ are forward biased p-n junctions.
n: Light emitting diode $(LED)$ emits spontaneous radiation.
: $LED$ are forward biased p-n junctions.
Updated On: Jul 28, 2022
- If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
- If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
- If Assertion is true but Reason is false
- If both Assertion and Reason are false
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The Correct Option is A
Solution and Explanation
When a junction diode is forward biased as shown in figure, energy is released at the junction due to recombination of electrons and holes. In the junction diode made of gallium arsenide or indium phosphide, the energy is released in visible region. Such a junction diode is called light emitting diode or $LED$. The radiated energy emitted by $LED$ is equal or less than the band gap of semiconductor.
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Concepts Used:
P-n Junction
A P-N junction is an interface or a boundary between two semiconductor material types, namely the p-type and the n-type, inside a semiconductor.
Biasing conditions for the p-n Junction Diode:
in p-n junction diode two operating regions are there:
- P-type
- N-type
There are three biasing conditions for p-n junction diode are as follows:
- Zero bias: When there is no external voltage applied to the p-n junction diode.
- Forward bias: P-type is connected to positive terminal of the voltage potential while n-type is connected to the negative terminal.
- Reverse bias: P-type is connected to negative terminal of the voltage potential while n-type is connected to the positive terminal.