Light Emitting Diodes?

Question

My Question is what is the structure of Light Emitting Diodes, all the parts. And How do LEDs work on a sub-stomic level e.g bohr model, photons etc

Answer 1

Excerpt from attached URL:

"As we saw in the last section, free electrons moving across a diode can fall into empty holes from the P-type layer. This involves a drop from the conduction band to a lower orbital, so the electrons release energy in the form of photons."

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