中文摘要：

在有机相中合成了不同尺寸的CdS和CdSe量子点,并利用Langmuir-Blodgett（LB）技术将相同尺寸的CdS和CdSe量子点组装成多层复合纳米有序结构.采用荧光光谱研究了CdS和CdSe量子点在混合体系和多层复合纳米有序结构状态下的荧光共振能量转移（Fluorescence resonance energy transfer,FRET）.我们观察到CdS和CdSe量子点混合溶液与当溶剂挥发形成固态膜中,CdS量子点的荧光强度较溶液状态下强烈猝灭,表明当颗粒间距离减小时CdS和CdSe量子点间产生较高效率的荧光共振能量转移.在多层复合纳米有序结构中,随着给体CdS量子点层数的增加,单层受体CdSe量子点的荧光逐步增强,这表明层间纵向能量转移率随给体层数的增加而提高.

英文摘要：

It is synthesized that the CdS and CdSe quantum dots with the different sizes in the organic phase. The CdS and CdSe quantum dots were assembled into multi-layer composite nanostructures using LB technology. We also investigate the fluorescence resonance energy transfer （FRET） of the quantum dots system and the multi-layer nanostructures. The results reveal that the fluorescence intensity of CdS quantum dots comparatively weaken seriously with the complete volatilization of solvents in CdS and CdSe quantum dots hybrid solution. This results in the enhancing of the FRET rate as minishing the intervals of quantum dots. In multi-layer composite nanostructures, the fluorescence intensity of CdSe quantum dots layer enhances with increasing the layer number of CdS quantum dots. This shows the increase of FRET rate with adding donor layers.