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Title: Origin of simultaneous donor-acceptor emission in single molecules of peryleneimide-terrylenediimide labeled polyphenylene dendrimers
Authors: Melnikov, Sergey M ×
Yeow, Edwin K. L
Uji-I, Hiroshi
Cotlet, Mircea
Muellen, Klaus
De Schryver, Frans
Enderlein, Joerg
Hofkens, Johan #
Issue Date: Feb-2007
Publisher: American Chemical Society
Series Title: Journal of Physical Chemistry B, Condensed Matter, Materials, Surfaces, Interfaces & Biophysical vol:111 issue:4 pages:708-719
Abstract: Forster type resonance energy transfer (FRET) in donor-acceptor peryleneimide-terrylenediimide dendrimers has been examined at the single molecule level. Very efficient energy transfer between the donor and the acceptor prevent the detection of donor emission before photobleaching of the acceptor. Indeed, in solution, on exciting the donor, only acceptor emission is detected. However, at the single molecule level, an important fraction of the investigated individual molecules (about 10-15%) show simultaneous emission from both donor and acceptor chromophores. The effect becomes apparent mostly after photobleaching of the majority of donors. Single molecule photon flux correlation measurements in combination with computer simulations and a variety of excitation conditions were used to determine the contribution of an exciton blockade to this two-color emission. Two-color defocused wide-field imaging showed that the two-color emission goes hand in hand with an unfavorable orientation between one of the donors and the acceptor chromophore.
ISSN: 1520-6106
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
× corresponding author
# (joint) last author

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