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Photo-induced fluorescence quenching in conjugated polymers dispersed in solid matrices at low concentration

Sahoo, Dibakar LU ; Tian, Yuxi LU ; Sforazzini, Giuseppe; Anderson, Harry L. and Scheblykin, Ivan LU (2014) In Journal of Materials Chemistry C 2(32). p.6601-6608
Abstract
When isolated conjugated polymer (CP) chains are studied by single molecule spectroscopy, excitation power density in the range of 10-1000 W cm(-2) is normally used. We show that at such excitation power densities the fluorescence ability of CPs is significantly reduced. A new methodological approach allowed us to measure the fluorescence quantum yield (QY) of thin matrix polymer films doped with fluorophores at very low concentration using fluorescence microscopy. Fluorescence QYs of different conjugated polymers (P3HT, MEH-PPV, PFBV and cyclodextrin-coated PFBV-Rtx) and a reference perylene diimide dye dispersed in the PMMA matrix were measured as a function of the excitation power density that ranged from similar to 10(-4) to 100 W... (More)
When isolated conjugated polymer (CP) chains are studied by single molecule spectroscopy, excitation power density in the range of 10-1000 W cm(-2) is normally used. We show that at such excitation power densities the fluorescence ability of CPs is significantly reduced. A new methodological approach allowed us to measure the fluorescence quantum yield (QY) of thin matrix polymer films doped with fluorophores at very low concentration using fluorescence microscopy. Fluorescence QYs of different conjugated polymers (P3HT, MEH-PPV, PFBV and cyclodextrin-coated PFBV-Rtx) and a reference perylene diimide dye dispersed in the PMMA matrix were measured as a function of the excitation power density that ranged from similar to 10(-4) to 100 W cm(-2). Already at an excitation power of 0.1 W cm(-2) (the power density of the sunlight at the Earth) a detectable reduction of the fluorescence QY was observed for most of the polymers. The origin of the QY reduction is exciton annihilation by photo-generated triplet and/or change-transfer states. Insulation by cyclodextrin was found to decrease significantly the effect of non-emissive quenching states. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Materials Chemistry C
volume
2
issue
32
pages
6601 - 6608
publisher
Royal Society of Chemistry
external identifiers
  • wos:000340216300020
  • scopus:84905028125
ISSN
2050-7526
DOI
10.1039/c4tc00831f
language
English
LU publication?
yes
id
86351441-6423-4219-a374-4e652ff88004 (old id 4659523)
date added to LUP
2014-09-25 09:05:09
date last changed
2017-07-23 03:02:01
@article{86351441-6423-4219-a374-4e652ff88004,
  abstract     = {When isolated conjugated polymer (CP) chains are studied by single molecule spectroscopy, excitation power density in the range of 10-1000 W cm(-2) is normally used. We show that at such excitation power densities the fluorescence ability of CPs is significantly reduced. A new methodological approach allowed us to measure the fluorescence quantum yield (QY) of thin matrix polymer films doped with fluorophores at very low concentration using fluorescence microscopy. Fluorescence QYs of different conjugated polymers (P3HT, MEH-PPV, PFBV and cyclodextrin-coated PFBV-Rtx) and a reference perylene diimide dye dispersed in the PMMA matrix were measured as a function of the excitation power density that ranged from similar to 10(-4) to 100 W cm(-2). Already at an excitation power of 0.1 W cm(-2) (the power density of the sunlight at the Earth) a detectable reduction of the fluorescence QY was observed for most of the polymers. The origin of the QY reduction is exciton annihilation by photo-generated triplet and/or change-transfer states. Insulation by cyclodextrin was found to decrease significantly the effect of non-emissive quenching states.},
  author       = {Sahoo, Dibakar and Tian, Yuxi and Sforazzini, Giuseppe and Anderson, Harry L. and Scheblykin, Ivan},
  issn         = {2050-7526},
  language     = {eng},
  number       = {32},
  pages        = {6601--6608},
  publisher    = {Royal Society of Chemistry},
  series       = {Journal of Materials Chemistry C},
  title        = {Photo-induced fluorescence quenching in conjugated polymers dispersed in solid matrices at low concentration},
  url          = {http://dx.doi.org/10.1039/c4tc00831f},
  volume       = {2},
  year         = {2014},
}