Question

Why is an exciton only observed when we excite to the conduction band and not to other electronic level inside the bandgap?

Answer 1

Hey mate ^_^

In the middle of the bandgap there could only be deep doping (or other defect) levels, electrons on them are bound, and when an electron is put to that level, there's no hole counterpart which to combine with to form an exciton...

#Be Brainly❤️

Answer 2

an exciting only observe when we exercise on the conduction band not to other electronic level inside the bandgap because the electrons on them are bound