Fluorescence decay time of single semiconductor nanocrystals.
We present fluorescence decay measurements of single ZnS covered CdSe nanocrystals. It is shown that the fluorescence decay time is fluctuating during the investigation leading to a multiexponential decay even for a single nanocrystal. In combination with measurements of the fluorescence blinking behavior we find that a high fluorescence intensity is correlated with a long fluorescence decay time. This is consistent with a model of fluctuating nonradiative decay channels leading to variable dynamic quenching processes of the excited state.
Schlegel
Germar
G
Institute for Physical Chemistry, University of Mainz, Welderweg 11, D-55099 Mainz, Germany.
Bohnenberger
Jolanta
J
Potapova
Inga
I
Mews
Alf
A