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Optical Spectroscopic Studies of a Soluble Fluorene-Based Conjugated Polymer: A Hydrostatic Pressure and Temperature Study

Published online by Cambridge University Press:  15 March 2011

S. Guha ,
J.D. Rice ,
C. M. Martin ,
W. Graupner ,
M. Chandrasekhar ,
H.R. Chandrasekhar  and
U. Scherf
S. Guha
Affiliation:
Dept. of Physics, Astronomy and Materials Science, Southwest Missouri State University, Springfield MO 65804, (USA)
J.D. Rice
Affiliation:
Dept. of Physics, Astronomy and Materials Science, Southwest Missouri State University, Springfield MO 65804, (USA)
C. M. Martin
Affiliation:
Dept. of Physics and Astronomy, University of Missouri, Columbia MO 65211, (USA)
W. Graupner
Affiliation:
Dept of Physics and Astronomy, Virginia Tech, Blacksburg, VA 24061; Present address: Austriamicrosystems, AG; Schloss Premstaetten, A 8141 Austria.
M. Chandrasekhar
Affiliation:
Dept. of Physics and Astronomy, University of Missouri, Columbia MO 65211, (USA)
H.R. Chandrasekhar
Affiliation:
Dept. of Physics and Astronomy, University of Missouri, Columbia MO 65211, (USA)
U. Scherf
Affiliation:
Institut für Physikalische und Theoretische Chemie, Universitaet Potsdam, Germany
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Abstract

Spectroscopic properties of conjugated molecules/polymers have varying degrees of sensitivity to backbone conformation. Optical studies are presented as a function of temperature and hydrostatic pressure, using photoluminescence and Raman scattering from two polymers with distinct differences in their backbone conformation, namely, polyfluorene (PF) and ladder type poly(para-phenylene)(m-LPPP). In contrast to the photoluminescence (PL) vibronics in mLPPP, the 0-0 PL vibronic peak in PF shows a red-shift with increasing temperatures. Pressure studies reveal that the PL spectrum of PF red-shifts and broadens with increasing pressures. The phonon lines in PF show an antiresonance effect at higher pressures indicating a strong electron-phonon interaction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 708: Symposium BB – Organic Optoelectronic Materials, Processing and Devices , 2001 , BB10.7
Copyright
Copyright © Materials Research Society 2002

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References

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