In this study, the researchers attempt to investigate the effect of irradiation of gamma doses in the range 25–150 kGy on the optical properties of sputtered ZnO thin films. The samples have a hexagonal wurtzite structure. The optical properties of the samples, such as the absorbance, transmittance, and reflectance, have been studied as a function of γ- irradiation doses. Several optical parameters, such as refractive index, optical energy gap, Urbach energy, oscillatory energy, dispersion energy, oscillator strength, and dielectric constant have been found to be affected by changing the γ- irradiation doses. The refractive index dispersion curve of the γ-irradiated and non-irradiated ZnO thin films meet the criteria of the single-oscillator model. The room temperature photoluminescence spectra of the samples under excitation 400 and 437 nm showed green emission nearly at 2.597 and 2.559 eV, and yellow emission approximately at 2.15 eV. The green emission bands can be attributed to a transition from CB to VZn −2 and −1 respectively, while the yellow emission band can be attributed to a transition between a shallow donor and a deep level.

中文翻译：

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高伽马辐射对ZnO薄膜光学和光致发光特性的影响

在这项研究中，研究人员试图研究 25-150 kGy 范围内的伽马剂量辐照对溅射 ZnO 薄膜光学特性的影响。样品具有六方纤锌矿结构。样品的光学特性，例如吸光度、透射率和反射率，已经作为 γ 辐射剂量的函数进行了研究。已经发现一些光学参数，例如折射率、光能隙、Urbach 能量、振荡能量、色散能量、振荡器强度和介电常数会受到改变 γ 辐射剂量的影响。γ 辐照和未辐照 ZnO 薄膜的折射率色散曲线符合单振荡器模型的标准。样品在 400 和 437 nm 激发下的室温光致发光光谱显示出接近 2.597 和 2.559 eV 的绿色发射，以及大约 2.15 eV 的黄色发射。绿色发射带可归因于分别从 CB 到 VZn -2 和 -1 的跃迁，而黄色发射带可归因于浅施主和深能级之间的跃迁。