CdS量子点与曙红Y间的荧光共振能量转移研究

Research on Fluorescence Resonance Energy Transfer between CdS Quantum Dots and Eosin Y

在水溶液中,量子点与有机荧光染料之间可能发生荧光共振能量转移(FRET)。本文以发射波长470nm的Cd S量子点为供体,曙红Y为受体,建立了Cd S量子点-曙红Y的FRET体系,研究了该体系的FRET参数。该体系受体供体数目比为8,猝灭效率为45.6%,增强效率为20.1%;供体-受体间的距离为4.4nm;临界能量转移距离为2.4nm。

In aqueous solution, fluorescence resonance energy transfer （FRET） behavior may occur between quantum dots （QDs） and organic fluorescent dyes. The FRET system was constructed by using the CdS QDs with an emission wavelength of 470 nm as an energy donor and Eosin Y as an acceptor. Some parameters of the FRET system were studied. In this system, the ratio of acceptor/donor was 8, quenching efficiency was 45.6% , reinforcing efficiency was 20. 1%, distance between donor and acceptor was 4. 4 nm, critical energy transfer distance was 2.4 nm.