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Control of β-phase formation in polyfluorene thin films via Franck–Condon analysis

Title data

Khan, Amena L. T. ; Banach, Michael J. ; Köhler, Anna:
Control of β-phase formation in polyfluorene thin films via Franck–Condon analysis.
In: Synthetic Metals. Vol. 139 (2003) Issue 3 . - pp. 905-907.
ISSN 0379-6779
DOI: https://doi.org/10.1016/S0379-6779(03)00244-3

Abstract in another language

In the blue light-emitting polymer poly(9,9-dioctylfluorene) (PFO) two distinct morphological phases have been identified, that is the glassy phase and a planar β-phase. We show that the proportion of the formation of the two phases can be controlled by simply spinning thin films from different solvents such as chloroform and cyclopentanone. We use a Franck–Condon analysis with vibrational modes obtained from Raman spectra to analyze the emission spectra at low temperature. Films spun from cyclopentanone are dominated by from the β-phase emission while films spun from chloroform have a high fraction of glassy phase emission. Comparison between absorption and emission spectra shows evidence for spectral diffusion from the glassy to the β-phase. We discuss the Huang–Rhys parameters for both phases.

Further data

Item Type: Article in a journal
Refereed: No
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
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 II - Optoelektronik weicher Materie
Result of work at the UBT: No
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 18 Mar 2015 08:20
Last Modified: 18 Mar 2015 08:20
URI: https://eref.uni-bayreuth.de/id/eprint/8460