Mn^(2+)和Ce^(3+)共掺杂的CdS量子点制备及其光谱研究

Preparation and luminescence spectra of Mn^(2+) and Ce^(3+) Co-doped CdS quantum dots

采用低温水热技术,以硫脲为稳定剂,在90℃的水相中合成了发蓝色荧光的Mn2+和Ce3+共掺杂的CdS体量子点。用透射电子显微镜对该量子点形貌进行了表征,其直径约为10 nm的球形颗粒。研究了该量子点的紫外-可见吸收光谱、荧光发射光谱以及荧光光谱随时间的变化。结果表明,Mn2+和Ce3+共掺杂使CdS量子点的发光强度提高10倍;该量子点具有较好的发光稳定性。

Ce^3＋ and Cd^2＋ co-doped CdS quantum dots（QDs） were synthesized in an aqueous solution at 90℃ using thiourea as a stabilizer.The as-prepared samples were characterized by transmission electron microscope.The prepared product was proved to be sphericity QDs and the diameter of about 10 nm.The as-prepared undoped and the Ce3＋ and Mn2＋ co-doped CdS QDs were characterized by UV-Vis spectrum and fluorescence spectrum.Results show that the co-doped CdS QDs have a better fluoresence intensity and stability than undoped CdS QDs.