Continuous distribution of emission states from single CdSe/ZnS quantum dots

被引：210

作者：

Zhang, K

Chang, HY

Fu, AH

Alivisatos, AP

Yang, H ^{[1
]}

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[3] Lawrence Berkeley Natl Lab, Phys Biosci Div, Berkeley, CA 94720 USA

来源：

NANO LETTERS | 2006年 / 6卷 / 04期

关键词：

D O I：

10.1021/nl060483q

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The photoluminescence dynamics of colloidal CdSe/ZnS/streptavidin quantum dots were studied using time-resolved single-molecule spectroscopy. Statistical tests of the photon-counting data suggested that the simple "on/off" discrete state model is inconsistent with experimental results. Instead, a continuous emission state distribution model was found to be more appropriate. Autocorrelation analysis of lifetime and intensity fluctuations showed a nonlinear correlation between them. These results were consistent with the model that charged quantum dots were also emissive, and that time-dependent charge migration gave rise to the observed photoluminescence dynamics.

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收藏

页码：843 / 847

页数：5

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