ZnO白漆的质子辐照损伤与光学性能退化机理

Proton Radiation Damage in ZnO-pigmented White Paints and Optical Degradation Mechanisms

为进一步阐明ZnO白漆的辐照损伤与光学性能退化机理,在模拟的空间环境下对S781白漆进行了150keV质子辐照实验。质子辐照后,在原位条件下测试了光谱反射系数和太阳吸收比的退化规律,并利用模拟仿真和光致荧光光谱研究了ZnO白漆与质子间的微观交互作用和辐照诱发缺陷。结果表明,质子辐照下ZnO颜料发生电离生成-1价锌空位,是S781白漆出现b带吸收和光学性能退化的主要原因。此外,本工作支持了ZnO绿带荧光源于锌空位的第一原理计算结果。

S781 white paints were irradiat in order to elucidate more definitely the ZnO-pigmented white paints. After proto lar absorptance was measured in situ. Th ed with 150 irradiation keV protons in a lated space environment, damage and optical degradation mechanisms n irradiations, the degradation in spectral refle e interaction between the protons and S781 whi ctance and te paints, for so- and the irradiation-induced defects, were also studied through simulations and photoluminescence. The re- sults show that the zinc vacancies in the 1-- charge state are due to the ionization of the ZnO pig- ments, and are responsible for the b band absorption and optical degradation. Furthermore, this work also supports the first-principles results of considering zinc vacancies as the defects responsible for the green luminescence band from ZnO.