锰掺杂纳米氧化锌的发光特性  

Photoluminescent Properties in Manganese-doped Zinc Oxide Tetropods

作　　者：王马华[1,2] 朱光平[2,3] 徐春祥[2] 

机构地区：[1]淮阴工学院电子信息工程系,江苏淮安223002 [2]东南大学先进光子学中心,南京210096 [3]淮北煤炭师范学院物理与电子信息学院,江苏淮北235000

出　　处：《光子学报》2010年第1期25-28,共4页Acta Photonica Sinica

基　　金：国家自然科学基金(10674023);中国高技术研究发展计划(2006AA03Z313);国家重点基础研究发展计划(2007CB9363000)资助

摘　　要：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四足纳米晶须。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355 nm与375 nm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,对掺杂样品中光致发光机理进行分析。结果表明,样品由沿[0001]方向生长、前端和内部长有纤细刺状结构的中空六方管组成;样品中掺入的Mn^(2+)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,而氧化锌晶体晶格周期对Mn^(2+)中d-d电子跃迁过程的影响,则是375 nm紫外光激发下掺杂样品中产生415 nm辐射峰的主要原因。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 muttitips at the front and inner,are composed of wurtzite ZnO growing along[0001] 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 Mne＋ s, which were placed substitutionally in a cation site of ZnO host lattice.

关 键 词：光致发光 锰掺杂 纳米氧化锌晶体 D-D跃迁 无辐射复合 

分 类 号：O472.3[理学—半导体物理] TN383[理学—物理]