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用溶胶 -凝胶法制备了不同组分的 Mgx Zn1-x O薄膜 . X射线衍射结果表明 ,薄膜为具有六角纤锌矿结构的纳米薄膜 ,晶粒尺寸 3～ 5 nm,随着 Mg进入 Zn O晶格 ,其晶格常数变小 .紫外 -可见吸收光谱表明 ,随着 Mg含量的增加带隙变宽 ,自由激子吸收峰明显蓝移 .室温光致发光光谱由很强的且与氧空位相关的深能级缺陷发光和较弱的紫外激子发光组成 ,激子发光强度和缺陷发光强度比随 x的增大而减小 ,表明 Mg原子进入 Zn O晶格会引起深能级缺陷的增加 . Mg0 .0 3 Zn0 .97O薄膜经 70 0℃热氧化后 ,紫外与可见发光强度比达到 3 0 .
The MgxZn1-xO films with different compositions were prepared by sol-gel method.The results of X-ray diffraction showed that the films were nano-thin films with hexagonal wurtzite structure and the grain size was 3 ~ 5 nm. O lattice, the lattice constant becomes smaller.Ultraviolet-visible absorption spectra show that with the increase of Mg content, the bandgap broadens and the free exciton absorption peak shows a blue shift. The room-temperature photoluminescence spectrum is composed of strong and oxygen The vacancy-related deep level defect luminescence and weaker UV exciton luminescence composition, the exciton luminescence intensity and the defect luminescence intensity ratio decrease with the increase of x, indicating that the entry of Mg atoms into the Zn O lattice will cause deep level defects Of the Mg0. 03Zn0 .97O film after 70 0 ° C thermal oxidation, the UV to visible luminous intensity ratio of 30.