Two ZnO crystal samples were irradiated by X-ray diffraction with dosage of 5 Gy at 25 K, and the thermoluminescence spectra of ZnO crystals were measured at 25–280 K. The results show that the center wavelengths of thermoluminescence emission bands of ZnO crystals are 600, 670 and 727 nm, respectively, and there is a temperature difference (～20 K) between the peaks at 727 nm and the other two emission bands around 150 K, which can contribute to the shift of vacancy inside ZnO. Besides, the thermolu-minesce...
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