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Site-selective spectroscopy of matrix-isolated conjugated polymers

Title data

Rauscher, U. ; Schütz, L. ; Greiner, Andreas ; Bässler, Heinz:
Site-selective spectroscopy of matrix-isolated conjugated polymers.
In: Journal of Physics: Condensed Matter. Vol. 1 (December 1989) Issue 48 . - pp. 9751-9763.
ISSN 1361-648X
DOI: https://doi.org/10.1088/0953-8984/1/48/022

Official URL: Volltext

Abstract in another language

Fluorescence spectra of poly(phenylphenylenevinylene) (PPPV) and poly(diphenylenediphenylvinylene) (PDPV) incorporated in a glassy methyltetra-hydrofuran matrix have been measured at 6 K upon site-selective excitation. Their shift with excitation energy above what is commonly referred to as band gap is incompatible with the band picture. Instead, localised transitions within segments of the chain have to be invoked for emission as well as for absorption as evidenced by deconvoluted fluorescence excitation spectra characteristic of chromophores sitting in a random environment. Solid film spectra can be rationalised in terms of additional inhomogeneous broadening. In PDPV, yet not in PPPV, the excitation is strongly coupled to a chain deformation associated with a twist vibration of the biphenyl unit. In PPPV the observed Stokes shift is attributed to electronic relaxation in the course of energy transfer. The electron-phonon coupling parameters have been evaluated.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: ISI:A1989CC31200022
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II > Chair Macromolecular Chemistry II - Univ.-Prof. Dr. Andreas Greiner
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 15 Apr 2015 14:04
Last Modified: 17 Apr 2015 06:58
URI: https://eref.uni-bayreuth.de/id/eprint/10343