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Host matrix dependent fluorescence intensity modulation by an electric field in single conjugated polymer chains

Hania, Ralph LU ; Thomsson, Daniel LU and Scheblykin, Ivan LU (2006) In The Journal of Physical Chemistry Part B 110(51). p.25895-25900
Abstract
An electric field oscillating at a frequency similar to 1 Hz is found to induce strong modulation of the fluorescence intensity of single poly[2-methoxy,5-(2'-ethyl-hexyloxy)-p-phenylene vinylene] (MEH-PPV) molecules (M-W similar to 10(6)) embedded in a poly(methyl methacrylate) (PMMA) matrix. The MEH-PPV polymer chains are carefully isolated from the electrodes to avoid effects of injection. In a polystyrene matrix, fluorescence intensity modulations are on average much less pronounced. The difference in average modulation depth can be explained in terms of lower field-induced exciton dissociation rates in the MEH-PPV/polystyrene system compared to MEH-PPV/PMMA because of a lack of suitable acceptor sites. The observed electric field... (More)
An electric field oscillating at a frequency similar to 1 Hz is found to induce strong modulation of the fluorescence intensity of single poly[2-methoxy,5-(2'-ethyl-hexyloxy)-p-phenylene vinylene] (MEH-PPV) molecules (M-W similar to 10(6)) embedded in a poly(methyl methacrylate) (PMMA) matrix. The MEH-PPV polymer chains are carefully isolated from the electrodes to avoid effects of injection. In a polystyrene matrix, fluorescence intensity modulations are on average much less pronounced. The difference in average modulation depth can be explained in terms of lower field-induced exciton dissociation rates in the MEH-PPV/polystyrene system compared to MEH-PPV/PMMA because of a lack of suitable acceptor sites. The observed electric field dependence of single-molecule fluorescence strongly suggests that energy transfer from singlet or even triplet excitons to long-living on-chain hole polarons contributes to the observed modulations. The observed large qualitative differences between the responses of different molecules probably reflect differences in chain topology and strongly anisotropic distributions of acceptor sites, while the hysteretic response of some molecules indicates conformational switching. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
The Journal of Physical Chemistry Part B
volume
110
issue
51
pages
25895 - 25900
publisher
The American Chemical Society
external identifiers
  • wos:000242974300055
  • scopus:33846437854
ISSN
1520-5207
DOI
10.1021/jp0653252
language
English
LU publication?
yes
id
375e5205-4e1f-4613-9854-72760728eaf5 (old id 681508)
date added to LUP
2008-01-03 15:38:15
date last changed
2019-03-17 04:20:42
@article{375e5205-4e1f-4613-9854-72760728eaf5,
  abstract     = {An electric field oscillating at a frequency similar to 1 Hz is found to induce strong modulation of the fluorescence intensity of single poly[2-methoxy,5-(2'-ethyl-hexyloxy)-p-phenylene vinylene] (MEH-PPV) molecules (M-W similar to 10(6)) embedded in a poly(methyl methacrylate) (PMMA) matrix. The MEH-PPV polymer chains are carefully isolated from the electrodes to avoid effects of injection. In a polystyrene matrix, fluorescence intensity modulations are on average much less pronounced. The difference in average modulation depth can be explained in terms of lower field-induced exciton dissociation rates in the MEH-PPV/polystyrene system compared to MEH-PPV/PMMA because of a lack of suitable acceptor sites. The observed electric field dependence of single-molecule fluorescence strongly suggests that energy transfer from singlet or even triplet excitons to long-living on-chain hole polarons contributes to the observed modulations. The observed large qualitative differences between the responses of different molecules probably reflect differences in chain topology and strongly anisotropic distributions of acceptor sites, while the hysteretic response of some molecules indicates conformational switching.},
  author       = {Hania, Ralph and Thomsson, Daniel and Scheblykin, Ivan},
  issn         = {1520-5207},
  language     = {eng},
  number       = {51},
  pages        = {25895--25900},
  publisher    = {The American Chemical Society},
  series       = {The Journal of Physical Chemistry Part B},
  title        = {Host matrix dependent fluorescence intensity modulation by an electric field in single conjugated polymer chains},
  url          = {http://dx.doi.org/10.1021/jp0653252},
  volume       = {110},
  year         = {2006},
}