高质量CdSe量子点的水相制备与表征

以巯基丁二酸为稳定剂, 亚硒酸钠为硒源, 制备了高质量水溶性CdSe量子点. 研究了反应时间、 镉与硒的摩尔比及镉与巯基丁二酸的摩尔比等实验条件对CdSe量子点光谱性能的影响. 分别用紫外-可见光谱、 荧光光谱、 X射线粉末衍射和透射电子显微镜等对量子点进行表征. 结果表明, 采用这种方法制得的CdSe量子点为立方晶型, 量子点的荧光发射峰在518～562 nm范围内连续可调, 并且发射峰的半峰宽始终保持在35 nm左右, 荧光量子产率可达21%.

Preparation and Characterization of High Quality CdSe Quantum Dots in Aqueous Solution

Using sodium selenite as selenium source and mercaptosuccinic acid(MSA) as stabilizer, high quality CdSe quantum dots(QDs) were conveniently prepared in aqueous solution. The influence of experimental conditions, including refluxing time, cadmium to selenium molar ratio and cadmium to MSA molar ratio, on the luminescent properties of the obtained CdSe QDs were systematically investigated. The obtained QDs were characterized by UV-Vis absorption spectrometry, photoluminescence(PL) spectrometry, X-ray powder diffraction(XRD) and transmission electron microscopy(TEM). The results show that the proposed method lead to the formation of cubic CdSe QDs with narrow fluorescence full width at half maximum(35 nm), high photoluminescence quantum yield(up to 21%), and a broad emission spectra tunable from 518 to 562 nm.