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Emission Diversity of ZnO Nanocrystals with Different Growth Temperatures

机译：不同生长温度下ZnO纳米晶的发射多样性

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Scanning electronic microscopy (SEM), X ray diffraction (XRD) and photoluminescence (PL) have been applied to the study of structural and optical properties of ZnO nanocrystals prepared by the ultrasonic spray pyrolysis (USP) at different temperatures. The variation of temperatures and times at the growth of ZnO films permits modifying the ZnO phase from the amorphous to crystalline, to change the size of ZnO nanocrystals (NCs), as well as to vary their photoluminescence spectra. The study has revealed three types of PL bands in ZnO NCs: defect related emission, the near-band-edge (NBE) PL, related to the LO phonon replica of free exciton (FE) recombination, and its second-order diffraction peaks. The PL bands, related to the LO phonon replica of FE, and its second-order diffraction in the room temperature PI spectrum testify on the high quality of ZnO films prepared by the USP technology.
机译：扫描电子显微镜（SEM），X射线衍射（XRD）和光致发光（PL）已被用于研究通过超声喷雾热解（USP）在不同温度下制备的ZnO纳米晶体的结构和光学性质。 ZnO薄膜生长时温度和时间的变化允许将ZnO相从无定形变为晶体，以改变ZnO纳米晶体（NCs）的尺寸，并改变其光致发光光谱。这项研究揭示了ZnO NCs中的三种PL谱带：与缺陷有关的发射，与自由激子（FE）重组的LO声子复制体相关的近带边缘（NBE）PL及其二级衍射峰。与FE的LO声子副本有关的PL带及其在室温PI光谱中的二阶衍射证明了USP技术制备的ZnO薄膜的高质量。

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