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•When the annealing time period was fixed to 4h, the XRD results showed the crystallinity was improved at first and then became poor as the annealing temperature increased. Furthermore, the PL results indicated the emission peak was red-shifted and then blue-shifted and the maximum shift span reached up to 40nm when the annealing temperature was 600°C.•With regard to the samples annealed at 600°C...
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