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A Comparative Study of the Photophysics in Polyfluorenes and Polyfluorenes with Polyphenylene Dendron Sidechains

Published online by Cambridge University Press:  21 March 2011

E. J. W. List ,
A. Pogantsch ,
F.P. Wenzl ,
C.-H. Kim ,
J. Shinar ,
M. A. Loi ,
G. Bongiovanni ,
A. Mura ,
S. Setayesh  and
A. C. Grimsdale
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E. J. W. List
Affiliation:
Institute for Solid State Physics, Technical University Graz, Petergasse 16, A-8010 Graz, Austria Ames Laboratory-USDOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
A. Pogantsch
Affiliation:
Institute for Solid State Physics, Technical University Graz, Petergasse 16, A-8010 Graz, Austria
F.P. Wenzl
Affiliation:
Institute for Solid State Physics, Technical University Graz, Petergasse 16, A-8010 Graz, Austria
C.-H. Kim
Affiliation:
Ames Laboratory-USDOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
J. Shinar
Affiliation:
Ames Laboratory-USDOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
M. A. Loi
Affiliation:
Dipartimento di Fisica and INFM, Università di Cagliari, I-09042 Monserrato (CA), Italy
G. Bongiovanni
Affiliation:
Dipartimento di Fisica and INFM, Università di Cagliari, I-09042 Monserrato (CA), Italy
A. Mura
Affiliation:
Dipartimento di Fisica and INFM, Università di Cagliari, I-09042 Monserrato (CA), Italy
S. Setayesh
Affiliation:
Max-Planck-Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany
A. C. Grimsdale
Affiliation:
Max-Planck-Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany
H.G. Nothofer
Affiliation:
Max-Planck-Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany
K. Müllen
Affiliation:
Max-Planck-Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany
U. Scherf
Affiliation:
Institut für Physikalische und Theoretische Chemie, Universität Potsdam, D-14476 Golm, Germany
G. Leising
Affiliation:
AT&S Research&Technology, Fabriksgasse 13, A-8700 Leoben, Austria; Institute of Nanostructured Materials and Photonics, Joanneum Research Inc., Franz-Pichler-Strasse 30, A-8160 Weiz, Austria
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Abstract

The cw absorption, steady state photoluminescence (PL), photoinduced absorption (PA), PL-detected magnetic resonance (PLDMR), and the time resolved PL of a novel polyfluorene (PF) prepared with bulky polyphenylene dendrimer substituents are compared with those of (PF) with ethyl-hexyl substituents. We show that the dendronic sidechains suppress the contribution from unwanted low energetic emission, yielding a polymer with pure blue emission. The sidechains also strongly alter the dynamics of the excited entities. In particular, the time-resolved PL and temperature-dependence of the cw PL from 20-320 K reveal distinct singlet exciton (SE) dynamics in the polymer films, while the behavior in solution is essentially the same. However, the PA results show that the dynamics of polarons and triplet excitons (TEs) are similar, and the PLDMR shows that the interaction between the SEs and polarons are also similar.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 665: Symposium C – Electronic, Optical and Optoelectronic Polymers and Oligomers , 2001 , C5.47
Copyright
Copyright © Materials Research Society 2001

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References

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