Fe-doped TiO2 films were prepared by sol–gel spin coating method. After annealing in vacuum, the structural and optical properties of the films were investigated. XRD patterns revealed that all diffraction peaks can be attributed to TiO2 with anatase phase structure. No segregated phases are present in the samples within XRD detection limit. XPS results indicated that iron element exists in a tervalent state and incorporates into TiO2 lattice. Raman spectra demonstrated that all the films are in pure anatase phase. No other vibration modes in the spectra were detected. Raman spectra are consistent with the results of XRD patterns. Photoluminescence spectra at room temperature are sensitive to the concentration of Fe doping. The quenching increases with the increase in amount of dopant, which can be due to the introduction of defect sites such as oxygen vacancy by Fe doping. The free hole can interact with a trapped electron, or a free electron can interact with a trapped hole, resulting in non-radiative.

中文翻译：

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溶胶-凝胶法制备Fe掺杂TiO2薄膜的结构和光学性能

铁掺杂二氧化钛2薄膜采用溶胶-凝胶旋涂法制备。在真空中退火后，研究了薄膜的结构和光学性能。XRD图谱显示所有衍射峰都可以归因于TiO2具有锐钛矿相结构。在 XRD 检测限度内，样品中不存在分离相。XPS结果表明铁元素以三价态存在并掺入到TiO中2格子。拉曼光谱表明所有薄膜都处于纯锐钛矿相。在光谱中没有检测到其他振动模式。拉曼光谱与 XRD 图案的结果一致。室温下的光致发光光谱对 Fe 掺杂浓度敏感。淬火随着掺杂剂量的增加而增加，这可能是由于 Fe 掺杂引入了缺陷位点，例如氧空位。自由空穴可以与被俘获的电子相互作用，或者自由电子可以与被俘获的空穴相互作用，从而产生非辐射。