Blinking suppression and intensity recurrences in single CdSe-oligo(phenylene vinylene) nanostructures: experiment and kinetic model

被引:38
作者
Early, K. T.
McCarthy, K. D.
Hammer, N. I.
Odoi, M. Y.
Tangirala, R.
Emrick, T.
Barnes, M. D. [1 ]
机构
[1] Univ Massachusetts, Dept Chem, George H Richardson Jr Chem Res Lab, Amherst, MA 01003 USA
[2] Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA
关键词
D O I
10.1088/0957-4484/18/42/424027
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
We report time-resolved single molecule fluorescence imaging of individual CdSe quantum dots that are functionalized with oligomeric conjugated organic ligands. The fluorescence intensity trajectories from these composite nanostructures display both a strong degree of blinking suppression and intensity fluctuations with characteristic recurrence times on the order of 10-60 s. In addition, fluorescence decay rate measurements of individual hybrid nanostructures indicate significantly modified non-radiative quantum dot decay rates relative to conventional ZnS-capped CdSe quantum dots. We show that a modified diffusive reaction coordinate model with slow fluctuations in quantum dot electron energies (1S(e), 1P(e)) can reproduce the experimentally observed behaviour.
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页数:7
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