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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/681508
- author
- Hania, Ralph
LU
; Thomsson, Daniel
LU
and Scheblykin, Ivan
LU
- organization
- publishing date
- 2006
- 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 (ACS)
- external identifiers
-
- wos:000242974300055
- scopus:33846437854
- ISSN
- 1520-5207
- DOI
- 10.1021/jp0653252
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)
- id
- 375e5205-4e1f-4613-9854-72760728eaf5 (old id 681508)
- date added to LUP
- 2016-04-01 15:59:27
- date last changed
- 2022-03-14 21:25:52
@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 (ACS)}},
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}},
doi = {{10.1021/jp0653252}},
volume = {{110}},
year = {{2006}},
}