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Reorganization of perylene bisimide J-aggregates: from delocalized collective to localized individual excitations.

Tian, Yuxi LU ; Stepanenko, Vladimir; Kaiser, Theo E; Würthner, Frank and Scheblykin, Ivan LU (2012) In Nanoscale 4(1). p.218-223
Abstract
Water-induced reorganization of individual one-dimensional J-aggregates of perylene bisimide (PBI) dyes was observed by fluorescence microscopy. Fluorescence spectra and decay kinetics of individual J-aggregates immobilized on glass surfaces were measured under a dry nitrogen atmosphere and under humid conditions. The fluorescence properties of PBI J-aggregates arisen from collective excitons under dry nitrogen atmosphere were changed to those of non-interacting dye monomers when water vapor was introduced into the environment (sample chamber). Time-dependent changes of the fluorescence spectra and lifetimes upon exposure to water vapor suggest an initial coordination of water molecules at defect sites leading to the formation of H-type... (More)
Water-induced reorganization of individual one-dimensional J-aggregates of perylene bisimide (PBI) dyes was observed by fluorescence microscopy. Fluorescence spectra and decay kinetics of individual J-aggregates immobilized on glass surfaces were measured under a dry nitrogen atmosphere and under humid conditions. The fluorescence properties of PBI J-aggregates arisen from collective excitons under dry nitrogen atmosphere were changed to those of non-interacting dye monomers when water vapor was introduced into the environment (sample chamber). Time-dependent changes of the fluorescence spectra and lifetimes upon exposure to water vapor suggest an initial coordination of water molecules at defect sites leading to the formation of H-type dimer units that act as exciton quenchers, and a subsequent slower disintegration of the hydrogen-bonded J-aggregate into monomers that lack resonance coupling. Our present studies resulted in a direct demonstration of how drastically the optical properties of molecular ensembles and characteristics of their excited states can be changed by delicate reorganization of dye molecules at nanometre scales. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nanoscale
volume
4
issue
1
pages
218 - 223
publisher
Royal Society of Chemistry
external identifiers
  • wos:000297848500029
  • pmid:22075846
  • scopus:83455219351
ISSN
2040-3372
DOI
10.1039/c1nr10973a
language
English
LU publication?
yes
id
b0a881e9-e1e9-4052-a2ba-15b04bdae613 (old id 2220904)
date added to LUP
2011-12-13 17:22:17
date last changed
2017-10-01 03:16:23
@article{b0a881e9-e1e9-4052-a2ba-15b04bdae613,
  abstract     = {Water-induced reorganization of individual one-dimensional J-aggregates of perylene bisimide (PBI) dyes was observed by fluorescence microscopy. Fluorescence spectra and decay kinetics of individual J-aggregates immobilized on glass surfaces were measured under a dry nitrogen atmosphere and under humid conditions. The fluorescence properties of PBI J-aggregates arisen from collective excitons under dry nitrogen atmosphere were changed to those of non-interacting dye monomers when water vapor was introduced into the environment (sample chamber). Time-dependent changes of the fluorescence spectra and lifetimes upon exposure to water vapor suggest an initial coordination of water molecules at defect sites leading to the formation of H-type dimer units that act as exciton quenchers, and a subsequent slower disintegration of the hydrogen-bonded J-aggregate into monomers that lack resonance coupling. Our present studies resulted in a direct demonstration of how drastically the optical properties of molecular ensembles and characteristics of their excited states can be changed by delicate reorganization of dye molecules at nanometre scales.},
  author       = {Tian, Yuxi and Stepanenko, Vladimir and Kaiser, Theo E and Würthner, Frank and Scheblykin, Ivan},
  issn         = {2040-3372},
  language     = {eng},
  number       = {1},
  pages        = {218--223},
  publisher    = {Royal Society of Chemistry},
  series       = {Nanoscale},
  title        = {Reorganization of perylene bisimide J-aggregates: from delocalized collective to localized individual excitations.},
  url          = {http://dx.doi.org/10.1039/c1nr10973a},
  volume       = {4},
  year         = {2012},
}