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Spectroscopic studies of impurity-host interactions in dye-doped polymers : Hydrostatic-pressure effects versus temperature effects

Titelangaben

Sesselmann, Thomas ; Richter, Wolfgang ; Haarer, Dietrich ; Morawitz, Hans:
Spectroscopic studies of impurity-host interactions in dye-doped polymers : Hydrostatic-pressure effects versus temperature effects.
In: Physical Review B. Bd. 36 (15 November 1987) Heft 14 . - S. 7601-7611.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.36.7601

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Link zum Volltext (externe URL): Volltext

Abstract

The method of photochemical hole burning is an excellent means for investigating small pressure shifts of the optical transitions of dye molecules embedded in polymeric host matrices. We have investigated both pressure- and temperature-induced line shifts and line broadenings and have been able to separate volume and temperature effects, which cannot be distinguished by only considering temperature-cycling experiments. On the basis of a concept, originally developed for vibrational dephasing in liquids, which separates the impurity-host interaction potential into two parts, we are able to determine quasistatic and dynamic contributions of the considered molecular interaction potentials in a quantitative fashion. These two contributions are opposite in sign and partially compensate each other in a temperature-cycling experiment. The ‘‘static’’ linewidth and line-shift parameters are governed by the van der Waals–like part of the impurity-host interaction potential and yield matrix parameters like the polymer compressibility κ by solely evaluating spectroscopic experimental data. The more complex ‘‘dynamic’’ contributions require the assumption of a steep short-range repulsive part of the interaction potential which is mainly responsible for the scattering (T2) processes leading to a phase loss in ground and excited states of the dye molecule. For our experimental studies we used the polymer glasses polymethylmethacrylate, polystyrene, and polyethylene doped with the dye molecule free-base phthalocyanine (H2Pc).

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: Hole-burning; Hydrostatic pressure; impurity-host interaction
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie - Univ.-Prof. Dr. Jürgen Köhler
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 13 Dec 2013 08:27
Letzte Änderung: 09 Jan 2015 10:52
URI: https://eref.uni-bayreuth.de/id/eprint/45