So from learning Band theory, and PN Junction and such, I've learned that photons are created when "holes" are filled in a band, and this is what can create light (Isn't this how LEDs work?)
Anyways, my question is - How come when Electrons move between conduction bands light isn't produced? Or is it and it's just so small we can't tell?
Because the conduction band is technically still an orbital, which means it can have "holes", right?
Secondary Question: Is there a "Point" in the orbitals in which the "Grip" a nucleus has on an electron becomes basically insignificant. Like I know it gets less and less as the Bands go outward, but is the conduction band basically a point where it's just "decided" that the electron at that band will probably not be attracted to the nucleus more than the thermal energy produced in a normal environment is much more?