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Can somebody explain me, why sometimes I see changes in position of luminescence maximum as temperature dependence in dielectric crystals? Is this is caused by band gap changes or maybe some exciton processes?

Thank you in advance!

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  • $\begingroup$ I think more specific information would be useful here, what crystals, what temperatures, what luminescent energies etc. Band-gap get smaller with increasing temperature. $\endgroup$ – boyfarrell Jun 2 '19 at 22:06

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