水相制备CdSe量子点及其ZnS核壳结构量子点

发布时间：2018-09-11 06:39

【摘要】：因具有较宽的可调控发光范围,CdSe量子点及其ZnS核壳结构量子点受到了研究者们的普遍关注。采用水相回流法合成了CdSe量子点及其ZnS核壳结构量子点,并结合透射电镜(TEM)、X射线衍射(XRD)、紫外-可见光吸收光谱(UV-Vis)和荧光光谱(PL)对样品进行表征。TEM结果表明,合成的量子点粒径分布较宽且结晶度较高;从XRD分析结果可以看出,CdSe量子点为闪锌矿结构,沿着晶面向外生长ZnS壳层后,谱峰向高角度偏移;从UV-Vis和PL分析结果可以看出,CdSe量子点于500 nm处出现吸收肩峰,于644 nm处出现半高宽较宽的缺陷发光峰;随着反应时间的延长,于577 nm处出现本征发光峰。包覆了ZnS壳层后,量子点不仅发光强度明显增大,而且稳定性显著提高。该合成方法节能环保、生产效率高,具有较大的应用空间。
[Abstract]:CdSe quantum dots and their ZnS core-shell structure quantum dots have attracted much attention due to their wide adjustable luminescence range. CdSe quantum dots and their ZnS core-shell structure quantum dots were synthesized by water-phase reflux method and combined with transmission electron microscopy (TEM), X-ray diffraction (XRD), ultraviolet-visible absorption spectroscopy (UV-Vis) and fluorescence spectroscopy (PL) pairs. The samples were characterized by TEM. The results showed that the CdSe quantum dots had a wider size distribution and higher crystallinity; XRD analysis showed that CdSe quantum dots were sphalerite structure, and the spectral peak shifted to a higher angle after growing ZnS shell along the crystal face; UV-Vis and PL analysis showed that CdSe quantum dots had an absorption acromion at 500 nm. With the extension of reaction time, the intrinsic luminescence peak appeared at 577 nm. After coating with ZnS shell, the luminescence intensity and stability of QDs increased significantly.
【作者单位】：东华大学材料科学与工程学院纤维材料改性国家重点实验室;
【基金】：国家自然科学基金面上项目(51272042)
【分类号】：TB383.1

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