Describe the working principle of LED with neat construction.
Working Diagram
Working:-When the junction is forward – biased the electron in the n-region combines with the holes.
These free electrons reside in the conduction band and at the higher energy level from the holes in the valence band. When the recombination takes place, these electrons return back to the valence band which is at a lower energy level than the conduction band.
While returning back, the recombining electrons give away the excess energy in the form of light