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Stepwise Decrease of Fluorescence versus Sequential Photobleaching in a Single Multichromophoric System

Title data

Issac, Abey ; Hildner, Richard ; Hippius, Catharina ; Würthner, Frank ; Köhler, Jürgen:
Stepwise Decrease of Fluorescence versus Sequential Photobleaching in a Single Multichromophoric System.
In: ACS Nano. Vol. 8 (2014) Issue 2 . - pp. 1708-1717.
ISSN 1936-086X
DOI: https://doi.org/10.1021/nn4060946

Official URL: Volltext

Abstract in another language

For individual molecules from the newly synthesized calix4arene tethered perylene bisimide (PBI) trimer, we studied the emitted fluorescence intensity as a function of time. Owing to the zigzag arrangement of PBI dyes in these trimers, the polarization state of the emission provides directly information about the emitting subunit within the trimer. Interestingly, we observed emission from all neutral subunits within a trimer rather than exclusively from the subunit with the lowest site energy. This can be understood in terms of thermally activated uphill energy transfer that repopulates the higher energetic chromophores. Together with the simultaneously recorded polarization-resolved emission spectra, this reveals that the emission from a multichromophoric system is governed by a complex interplay between the temporal variations of the photophysical parameters of the subunits, bidirectional hopping processes within the trimer, and unavoidable photobleaching. Moreover, it is demonstrated that the typically observed stepwise decrease of the signal from a multichromophoric system does not necessarily reflect sequential bleaching of the individual chromophores within the macromolecule.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie - Univ.-Prof. Dr. Jürgen Köhler
Profile Fields > Advanced Fields > Polymer and Colloid Science
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Graduate Schools > Bayreuth Graduate School of Mathematical and Natural Sciences (BayNAT) > Photophysics of Synthetic and Biological Multichromophoric Systems
Graduate Schools > Elite Network Bavaria
Graduate Schools > Elite Network Bavaria > Macromolecular Science
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Graduate Schools
Graduate Schools > Bayreuth Graduate School of Mathematical and Natural Sciences (BayNAT)
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 20 Apr 2015 06:14
Last Modified: 20 Apr 2015 06:14
URI: https://eref.uni-bayreuth.de/id/eprint/10523