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  4. Strongly Red-Shifted Photoluminescence Band Induced by Molecular Twisting in Cyanine (Cy3) Dye Films
 
research article

Strongly Red-Shifted Photoluminescence Band Induced by Molecular Twisting in Cyanine (Cy3) Dye Films

Anantharaman, Surendra B.
•
Yakunin, Sergii
•
Peng, Chuyao
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2017
Journal Of Physical Chemistry C

Cyanine dye molecules, used as monomers or in aggregate form, find interesting applications in optoelectronic devices. Among the various aggregate species incorporating organic dyes, centrosymmetric dimers are known as nonluminescent. They can act as exciton quenchers due to a low-energy optically forbidden excited state. In this study, however, we, show that a dimer species in thin films exhibits efficient and strongly red-shifted photoluminescence. When the films were excited, a monomer emission at 590 nm along with a second emission peak at 680 nm was observed. A close relation between the dye concentration and the emission showed that a new emission at 680 nm corresponds to the dimer emission. Circular dichroism (CD) spectroscopy reveals that a fraction of the dimers exist in a twisted dimer configuration. Stable, long-lived, and quenchable fluorescence with high quantum yield is attributed to this (Timer emission.

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Type
research article
DOI
10.1021/acs.jpcc.7b01412
Web of Science ID

WOS:000400881100052

Author(s)
Anantharaman, Surendra B.
Yakunin, Sergii
Peng, Chuyao
Goncalves Vismara, Marcus Vinicius
Graeff, Carlos F. O.
Nuesch, Frank A.
Jenatsch, Sandra
Hany, Roland
Kovalenko, Maksym V.
Heier, Jakob
Date Issued

2017

Publisher

American Chemical Society

Published in
Journal Of Physical Chemistry C
Volume

121

Issue

17

Start page

9587

End page

9593

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
UPNUES  
Available on Infoscience
July 10, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/139110
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