Strongly Red-Shifted Photoluminescence Band Induced
by Molecular Twisting in Cyanine (Cy3) Dye Films
Version 2 2017-06-28, 20:18
Version 1 2017-04-21, 19:33
Posted on 2017-06-28 - 20:18
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 dimer emission.
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Anantharaman, Surendra
B.; Yakunin, Sergii; Peng, Chuyao; Vismara, Marcus Vinícius
Gonçalves; F. O. Graeff, Carlos; Nüesch, Frank A.; et al. (2017). Strongly Red-Shifted Photoluminescence Band Induced
by Molecular Twisting in Cyanine (Cy3) Dye Films. ACS Publications. Collection. https://doi.org/10.1021/acs.jpcc.7b01412
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AUTHORS (10)
SA
Surendra
B. Anantharaman
SY
Sergii Yakunin
CP
Chuyao Peng
MV
Marcus Vinícius
Gonçalves Vismara
CF
Carlos F. O. Graeff
FN
Frank A. Nüesch
SJ
Sandra Jenatsch
RH
Roland Hany
MK
Maksym V. Kovalenko
JH
Jakob Heier