期刊
CHEMPHYSCHEM
卷 11, 期 4, 页码 897-904出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200900724
关键词
chromophores; conjugated polymers; correlation analysis; fluorescence; single-molecule studies
资金
- Swedish Research Council
- Royal Physiographic Society in Lund
- Knut & Alice Wallenberg Foundation
- Crafoord Foundation
- Marie Curie postdoctoral fellowship
Single-molecule spectroscopy techniques are used to investigate time fluctuations of the fluorescence properties of two different types of conjugated polymer, a polythiophene derivative (PDOPT) and a phenylene vinylene derivative (MEH-PPV), at 100 and 293 K. Linear correlation coefficients between fluorescence intensity and polarization are used to characterize fluctuations. We are able to distinguish between different blinking and bleaching effects on the polarization. Further-more, the polarization data reveal clear differences in the topology of these two polymers, which is related to the ordered conformation of the MEH-PPV. Plots of correlation coefficients appear to be very different for the two polymers and are also very sensitive to temperature. These observations prove that correlation analysis is a useful tool to understand fluorescence fluctuations in multi-chromophoric systems.
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