紫外激发下锰掺杂纳米氧化锌

应用气相传输法, 以铜为催化剂, 在硅衬底上制备了锰掺杂氧化锌纳米四足晶须. 利用x射线与电子衍射谱、扫瞄电镜和高分辨率透射电镜, 对样品形貌、结构和成份进行表征与检测; 通过355nm与375nm紫外光激发下掺杂与未掺杂样品光致发光谱的对比, 结合拉曼散射谱与光致激发谱对掺杂样品中反常光致发光机理进行分析. 结果表明, 样品沿［0001］方向生长的前端和内部长有纤细刺状结构的中空六方管组成; 样品中掺入Mn2+的无辐射复合中心作用, 是掺杂样品紫外辐射强度和谱宽变小的主要原因, 氧化锌晶体中晶格周期对Mn2+中d-d电子跃迁过程的影响, 是375nm紫外光激发下掺杂样品中415nm辐射峰产生的主要原因.

Photoluminescent Properties in Manganese-doped Zinc Oxide Tetropods

Manganese-doped zinc oxide tetropods were fabricated of pure ZnO,MnO,and graphite power mixtures on a silicon wafer coated with a thin layer of copper as catalyst through vapor-phase transport method.The morphology,structure,and composition of samples were measured and examined by x-ray diffraction pattern,electron diffraction pattern,scanning electron microscopy picture,and high revolution transition electron microscopy images.Compared with un-doped samples fabricated under the same conditions,PL spectrum,and mechanism were analyzed by the combination of Raman scattering spectra and photoluminescent excitation spectra.The results that Mn-doped samples,showing hexagonal hollow shape with multitips at the front and inner,are composed of wurtzite ZnO growing along0001] direction; both intensity and width of UV band reduced,and a new emission peak at 415 nm emerged,were observed from Mn-doped samples' PL spectrum.According to analysis based on Raman scattering and photoluminescent excitation spectra measurement,these properties should be attributed to the function as nonradiation recombination centers and d-d transition from excited states to ground state of Mn~(2+) s,which were placed substitutionally in a cation site of ZnO host lattice.