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所属单位：航天学院

发表刊物：J Lumin

摘要：Impurities and surface hydroxyl groups play vital roles in tailoring the physicochemical properties of metal oxides. Herein, commercial ZnO nanocrystals (Sigma-Aldrich) were selected to trace the impurity and hydroxyl group evolution by temperature dependent photoluminescence spectrum, infrared spectrum and electron spin resonance spectrum. It is found that the structured Cu impurity emission in ZnO appeared when the temperature is down to 100 K. As thermal annealing reduced the donors significantly, the corresponding 5780 cm−1 and 5820 cm−1 IR peaks can be observed when the annealing temperature is above 600 °C. Further annealing at 800 °C increases the Cu2+ concentration as well as activates the diffusion of lithium impurity, both of which contribute to the visible luminescence. Besides, a group of IR peaks in the range of 3400–3700 cm−1 were found to be vanished after 800 °C thermal annealing, demonstrating their hydroxyl features rather than the previously proposed defect origin. © 2019 Elsevier B.V.

ISSN号：0022-2313

是否译文：否

发表时间：2019-05-01

合写作者：方美华,Chen, Kaijian,Chai, Ziyi

通讯作者：吕金鹏