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maxxlr8
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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:
Thank you
- Is the level in the forbidden band?
- How does this level exist?
Thank you