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

  1. Nov 19, 2013 #1
    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
  2. jcsd
  3. Jul 21, 2015 #2
    Near band edge emission may arise essentially from excitonic or other shallow trap states
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