The peak shifting for PL is about 2 eV compared to bulk ZnO. What can be the possible reason?
The PL peak for bulk ZnO is 3.6 eV approx. But the peak for my doped ZnO sample is observed to be near 1.9 eV. So a big shift is observed. I am interested to know the reason behind this massive shift.
Dear Sandip,
It is not clear how do you excited the samples for the PL It is also that one has to scan the whole range of the possible wavelength emissions. If the incident primary photons have higher energy than the energy gap of the ZnO and your spectrum analyzer resolves all the emissions expected from the material , then it is so that the photo emission is controlled by the defects in your material. It is reported that due to the presence of defects in ZnO it can emit photons in the visible range.
For detailed information about the PL inZnO and their origin please follow the link: https://arxiv.org/ftp/arxiv/papers/1203/1203.4366.pdf
wish you success
Before analyzing this shift of your PL spectra with regards to the material system, you can check your measurement setup. Take a known sample to check the PL setup. If your setup is fine, you can change sample temperature, excitation density to analyze the behavior of this peak.
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