利用溶胶-凝胶法制备了纳米ZnO薄膜,室温下测量了样品的光致发光谱(PL)、吸收谱(ABS)、X射线衍射谱(XRD).X射线衍射(XRD)的结果表明:纳米ZnO薄膜呈多晶状态,具有六角纤锌矿晶体结构和良好的C轴取向.观察到二个荧光发射带,中心波长分别位于395nm的紫带、524nm的绿带和450nm附近的蓝带.证实了纳米ZnO薄膜绿光可见发射带来自氧空位(V0)形成的浅施主能级和锌空位(VZn)形成的浅受主能级之间的复合;450nm附近的蓝带来自电子从V0的浅施主能级到价带顶或锌填隙(Zni)到价带顶或导带底到VZn的浅受主能级的复合.

Nanocrystalline ZnO films is a promising material for short-wave laser and luminescence etc, due to its wide band gap (3.37 eV) and high exciton binding energy(60 meV)at room temperature.Nanocrystalline ZnO films is prepared by using sol-gel, grow on a quartz glass subtractes, Photoluminescence spectra and Absorption spectra of nanocrystalline ZnO films with excitation wavelength 365 nm are measured at room temperature.Two emission bands are observed, one being a narrow violet band its central wavelength is 395nm and the other being wide visible band its central wavelength is 524 nm, 450 nm.Crystal structure of samples are examined by X-ray diffraction (XRD) pattern, the mean grain size of nanocrystalline ZnO films are calculated by with Debye-Scherrer formula.The results indicate that nanocrystalline ZnO films has a hexagonal wurtzite structure and polycrystalline, and showed sharp diffraction peak for ZnO(002),which indicate that as-sputered film were highly c-axis oriented.In particular the mechanism behind......