中文摘要：

以巯基丙酸（MPA）为稳定剂，CdSe量子点为核，在水相中合成了具有较高荧光量子效率和化学稳定性的Ⅱ型核壳半导体量子点．通过荧光光谱、紫外-可见光吸收光谱和X-射线衍射方法对该CdSe／ZnTeⅡ型核壳量子点的光谱性质和结构进行了表征，证明：CdSe／ZnTeⅡ型核壳量子点的荧光发射光谱在500—573nm连续可调，半峰宽为40～50nm，荧光量子产率高达6．8％；粒型为球形，粒径约3．2nm，且粒径分布均匀；晶体结构为立方晶型．

英文摘要：

It was synthesised a type Ⅱ core-shell semiconductor quantum dots（QDs） with high fluorescence quantum efficiency and chemical stability in aqueous solution. In which MPA was used as stabilizing agent and the prepared CdSe was used as core material. The fluorescence spectrum, UV-vis absorption spectra and X-ray diffraction （XRD ） were performed to investigate the optical properties and the structure of QDs. The results showed that the fluorescence emission spectrum of type Ⅱ CdSe/ZnTe tuned continuously from 500 nm to 570 nm, its half peak width was 40 -50 nm and the fluorescence quantum yield was as high as 6.8%. Further- more, the particles were spherical, particle size was about 3.2 nm, particle size distribution was uniform, and the crystal structure was cubic.