In the case of Photoluminescence in UV range, why the ZnO excitonic peaks intensity decrease with temperatures ?

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Zhiqiang Yu

Hello，Bouzourâa，

I've found possible explanation in some literatures as below:

The peak intensity decrease with temperature is mainly caused by the thermal ionization of the bound exciton (BE) and the change of bandgap, assuming that the exciton binding energy do not change with temperature.