水相中CdSe与核/壳CdSe/CdS量子点的制备与发光特性研究

无机材料学报, 2006, 21(2): 322-328. doi: 10.3724/SP.J.1077.2006.00322

水相中CdSe与核/壳CdSe/CdS量子点的制备与发光特性研究

北京交通大学光电子技术研究所, 信息存储、显示与材料部级开放实验室

Institute of Optoelectronic Technology and Laboratory of Information Storage, Display and Materials, Beijing Jiaotong University, Beijing 100044, China

关键词：量子点 , aqueous solution , preparation , characterization

Preparation and Luminescent Properties of CdSe and Core-Shell CdSe/CdS Quantum Dots in Aqueous Solution

TANG Ai-Wei , TENG Feng , GAO Yin-Hao , LIANG Chun-Jun , WANG Yong-Sheng

Keywords： quantum dots , 水相 , 制备 , 表征

以巯基乙酸为稳定剂在水相中制备了CdSe与核/壳型CdSe/CdS量子点水溶胶, 用紫外-可见吸收光谱和发射光谱研究了它们的发光特性, 并且用X射线粉末衍射(XRD)、透射电镜(TEM)和X射线光电子能谱(XPS)表征了它们的结构、形貌和化学组成, 结果表明使用该方法制备的量子点分散性良好, 而且用CdS对CdSe进行表面修饰以后的发光强度明显提高, 发射光谱和吸收光谱都有红移现象, 不同粒径颗粒的吸收峰的位置也有所不同.

CdSe and core/shell CdSe/CdS quantum dots (QDs) were prepared in aqueous solution by using mercapto-acetate acid as stabilizer.Their luminescence characterization was studied by UV-Vis absorption and emission spectra. The nanocrystals were characterized by
X-ray powder diffraction (XRD), transmission electron microscope (TEM) and
X-ray photoelectron spectroscopy (XPS), which were used to characterized their
structure, shape and composition. The results indicated that the quantum dots
synthesized with this method possessed better dispersibility, as well as the
intensity of luminescence of the quantum dots modified the surface was
enhanced greatly and the red shift was shown in the emission and absorption
spectra. The position of absorption peak was different with the different
quantum dots’ sizes.

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