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Fluorescence blinking, exciton dynamics, and energy transfer domains in single conjugated polymer chains.

Lin, Hongzhen LU ; Tabaei, Seyed R LU ; Thomsson, Daniel LU ; Mirzov, Oleg LU ; Larsson, Per-Olof LU and Scheblykin, Ivan LU (2008) In Journal of the American Chemical Society 130(22). p.7042-7051
Abstract
In order to understand exciton migration and fluorescence intensity fluctuation mechanisms in conjugated polymer single molecules, we studied fluorescence decay dynamics at "on" and "off" fluorescence intensity levels with 20 ps time resolution using MEH-PPV [poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] dispersed in PMMA. Two types of intensity fluctuations were distinguished for single chains of conjugated polymers. Abrupt intensity fluctuations (blinking) were found to be always accompanied by corresponding changes in fluorescence lifetime. On the contrary, during "smooth" intensity fluctuations no lifetime change was observed. Time-resolved data in combination with data on fluorescence emission and excitation anisotropy... (More)
In order to understand exciton migration and fluorescence intensity fluctuation mechanisms in conjugated polymer single molecules, we studied fluorescence decay dynamics at "on" and "off" fluorescence intensity levels with 20 ps time resolution using MEH-PPV [poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] dispersed in PMMA. Two types of intensity fluctuations were distinguished for single chains of conjugated polymers. Abrupt intensity fluctuations (blinking) were found to be always accompanied by corresponding changes in fluorescence lifetime. On the contrary, during "smooth" intensity fluctuations no lifetime change was observed. Time-resolved data in combination with data on fluorescence emission and excitation anisotropy lead to a picture where a single polymer molecule is seen as consisting of several energy transfer domains. Exciton migration is efficient within a domain and not efficient between domains. Each domain can have several emitting low-energy sites over which the exciton continuously migrates until it decays. Emission of individual domains is often highly polarized. Fluorescence from a domain can be strongly quenched by Forster energy transfer to a quencher (hole polaron) if the domain overlaps with the quenching sphere. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of the American Chemical Society
volume
130
issue
22
pages
7042 - 7051
publisher
The American Chemical Society
external identifiers
  • wos:000256301200039
  • pmid:18473464
  • scopus:44449165571
ISSN
1520-5126
DOI
10.1021/ja800153d
language
English
LU publication?
yes
id
18d6e013-03a9-4fd7-afaa-945dc0e40695 (old id 1154283)
date added to LUP
2008-10-08 12:48:16
date last changed
2017-10-22 04:05:44
@article{18d6e013-03a9-4fd7-afaa-945dc0e40695,
  abstract     = {In order to understand exciton migration and fluorescence intensity fluctuation mechanisms in conjugated polymer single molecules, we studied fluorescence decay dynamics at "on" and "off" fluorescence intensity levels with 20 ps time resolution using MEH-PPV [poly(2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] dispersed in PMMA. Two types of intensity fluctuations were distinguished for single chains of conjugated polymers. Abrupt intensity fluctuations (blinking) were found to be always accompanied by corresponding changes in fluorescence lifetime. On the contrary, during "smooth" intensity fluctuations no lifetime change was observed. Time-resolved data in combination with data on fluorescence emission and excitation anisotropy lead to a picture where a single polymer molecule is seen as consisting of several energy transfer domains. Exciton migration is efficient within a domain and not efficient between domains. Each domain can have several emitting low-energy sites over which the exciton continuously migrates until it decays. Emission of individual domains is often highly polarized. Fluorescence from a domain can be strongly quenched by Forster energy transfer to a quencher (hole polaron) if the domain overlaps with the quenching sphere.},
  author       = {Lin, Hongzhen and Tabaei, Seyed R and Thomsson, Daniel and Mirzov, Oleg and Larsson, Per-Olof and Scheblykin, Ivan},
  issn         = {1520-5126},
  language     = {eng},
  number       = {22},
  pages        = {7042--7051},
  publisher    = {The American Chemical Society},
  series       = {Journal of the American Chemical Society},
  title        = {Fluorescence blinking, exciton dynamics, and energy transfer domains in single conjugated polymer chains.},
  url          = {http://dx.doi.org/10.1021/ja800153d},
  volume       = {130},
  year         = {2008},
}