Variable temperature single-molecule dynamics of MEH-PPV

Jong Lee Young, Young Kim Doo, John K. Grey, Paul F. Barbara

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


Herein, we continue our investigation of the single-molecule spectroscopy of the conjugated polymer poly[2-methoxy,5-(2′-ethylhexyloxy)-p-phenylene- vinylene] (MEH-PPV) at cryogenic temperatures. First, the low temperature microsecond dynamics of single MEH-PPV conjugated polymer molecules are compared to the dynamics at room temperature revealing no detectible temperature dependence. The lack of temperature dependence is consistent with the previous assignment of the dynamics to a mechanism that involves intersystem crossing and triplet-triplet annihilation. Second, the fluorescence spectra of single MEH-PPV molecules at low temperature are studied as a function of excitation wavelength (i.e. 488, 543, and 568 nm). These results exhibit nearly identical fluorescence spectra for different excitation wavelengths. This strongly suggests that electronic energy transfer occurs efficiently to a small number of low-energy sites in the multichromophoric MEH-PPV chains.

Original languageEnglish
Pages (from-to)2404-2409
Number of pages6
Issue number11
StatePublished - Nov 11 2005


  • Chromophores
  • Conjugated polymers
  • Excitons
  • Fluorescence
  • Single-molecule spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry


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