Consider the following band diagram of a simple LED. Assume essentially all recombination is direct and results in light emission. The forward-bias current consists of holes injected from a contact on the left and electrons injected from a contact on the right.
In which region would you expect the optical recombination rate to be the greatest? Circle one.
What is the approximate energy of the emitted photons in eV?
For a steady state current I = 10 mA, assuming all photons escape, what is the optical output power consistent with your answer to part ...
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