Schlegel Germar, Bohnenberger Jolanta, Potapova Inga, Mews Alf
Institute for Physical Chemistry, University of Mainz, Welderweg 11, D-55099 Mainz, Germany.
Phys Rev Lett. 2002 Apr 1;88(13):137401. doi: 10.1103/PhysRevLett.88.137401. Epub 2002 Mar 14.
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.
我们展示了单个硫化锌包覆的硒化镉纳米晶体的荧光衰减测量结果。结果表明，在研究过程中荧光衰减时间存在波动，即使对于单个纳米晶体也会导致多指数衰减。结合荧光闪烁行为的测量，我们发现高荧光强度与长荧光衰减时间相关。这与波动的非辐射衰减通道模型一致，该模型导致激发态的可变动态猝灭过程。
