Help: What is Band-Edge and Near-Band-Edge Emission?

  • Thread starter maxxlr8
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Main Question or Discussion Point

I understand that in photoluminescence band edge emission in direct band gap semiconductors originates from the recombination of electron and hole in the edge of conduction and valence bands. However, recently I have stumbled upon near-band-edge emission, which seem to suggest the existence of other levels. My question is:
  1. Is the level in the forbidden band?
  2. How does this level exist?

Thank you
 

Answers and Replies

  • #2
Near band edge emission may arise essentially from excitonic or other shallow trap states
 

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