低能质子辐照对ZnO白漆光学性能退化的影响

Effects of low energy protons on optical degradation of ZnO white paint

通过光致荧光光谱解谱和X射线光电子能谱(XPS)分析,研究了ZnO白漆经受能量低于200keV低能质子辐照过程中氧空位缺陷的形成与演化过程。XPS解析表明质子辐照后晶格氧减少,光致荧光光谱解析表明锌空位减少,说明ZnO白漆中氧空位数量增加,且双电离氧空位能够捕获价带中的电子转变为单电离氧空位,使单电离氧空位逐渐成为辐照产生的主要缺陷。质子辐照使ZnO白漆中氧空位数量增加,而氧空位易捕获电子形成色心,从而导致光学性能下降。

The formation and evolution of oxygen vacancies in ZnO were investigated in terms of photoluminescence spectroscopy and X-ray white paint during exposure to less than 200 keV protons photoelectron spectroscopy （XPS）. The decreases of lattice oxygen and Zn vacancies which are respectively shown by XPS and photoluminescence spectroscopy, indicate that oxygen vacancies of ZnO white paint increases under the proton irradiation. The double ionized oxygen vacancies can trap electrons in the conductive bands to become the single ionized oxygen vacancies, leading to that the singly ionized oxygen vacancies gradually become the major defects induced by the proton irradiation. Proton irradiation leads to increase the amount of oxygen vacancy, and oxygen vacancy can trap electrons to form color center, which results in optical degradation of ZnO white paint.