The I-V characteristic of an LED is represent | vedclass

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(B) An $LED$ is a forward-biased $p-n$ junction diode that emits light when current flows through it. The energy of the emitted photons is given by $E

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(B) An $LED$ is a forward-biased $p-n$ junction diode that emits light when current flows through it. The energy of the emitted photons is given by $E = h
u = \frac{hc}{\lambda}$. Since $E = eV$,where $V$ is the threshold voltage,we have $eV = \frac{hc}{\lambda}$,which implies $V \propto \frac{1}{\lambda}$. Since the frequency $
u$ is related to wavelength $\lambda$ by $
u = \frac{c}{\lambda}$,we have $V \propto 
u$. Higher frequency light (like blue) requires a higher threshold voltage compared to lower frequency light (like red). Therefore,for a given current,the voltage required increases in the order $R < Y < G < B$. The graph that correctly depicts this forward-biased characteristic where the threshold voltage increases with frequency is the one where the curves shift to the right as we move from red to blue.

The $I-V$ characteristic of an $LED$ is represented by which of the following graphs?

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