Single-molecule fluorescence spectroscopy studies of photo-induced electron transfer between CdSe/ZnS quantum dots and fullerene

摘要

Photo-induced electron transfer in CdSe/ZnS semiconductor quantum dot-fullerene conjugates was investigated by single molecule fluorescence spectroscopy. The average rate for photoinduced electron transfer is estimated around 10~8s~(-1). Quenching by electron transfer is observed in the "on" state and it manifests both as reduced fluorescence intensity and as shortening in fluorescence lifetime. As a result, the electron transfer changes the on/off dynamics of the fluorescence intensity of individual quantum dots.