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以溶于十八烯的Se作为Se前驱体,在无膦条件下制备得到了具有较高量子产率的Mn:ZnSe纳米晶.为了进一步提高纳米晶的稳定性和发光强度,运用外延生长的方法进行ZnS壳层包覆并得到了具有核-壳结构的Mn:ZnSe/ZnS纳米晶.X射线衍射、透射电子显微镜及吸收和荧光光谱测试结果表明,该方法合成的Mn:ZnSe纳米晶以及核-壳结构Mn:ZnSe/ZnS纳米晶均为闪锌矿结构,具有良好的单分散性,包覆ZnS外壳层后量子产率可达到60%以上.此外,对ZnS壳层厚度和Mn2+的掺杂量对Mn:ZnSe/ZnS纳米晶发光强度的影响及发光机制也进行了初步讨论.
In order to further improve the stability and luminescence intensity of nanocrystal, Se-containing octadecene was used as Se precursor to prepare Mn: ZnSe nanocrystal with high quantum yield in the absence of phosphine. ZnS / ZnS nanocrystals with core-shell structure were obtained by X-ray diffraction, transmission electron microscopy and absorption and fluorescence spectroscopy.The results show that the Mn: ZnSe / ZnS nanocrystals synthesized by this method and The core-shell structure Mn: ZnSe / ZnS nanocrystals are sphalerite structure with good monodispersity, the quantum yield can reach more than 60% after the cladding of ZnS shell .In addition, the ZnS shell thickness and Mn2 + The effect of doping on the luminescence intensity of Mn: ZnSe / ZnS nanocrystals and the luminescent mechanism were also discussed.