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  Long lived photoexcitation dynamics in a dendronically substituted poly(fluorene)

Pogantsch, A., Wenzl, F. P., Scherf, U., Grimsdale, A. C., Müllen, K., & List, E. J. W. (2003). Long lived photoexcitation dynamics in a dendronically substituted poly(fluorene). The Journal of Chemical Physics, 119(13), 6904-6910. doi:10.1063/1.1603723.

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Pogantsch, A., Author
Wenzl, F. P., Author
Scherf, Ullrich1, Author              
Grimsdale, Andrew C.2, Author              
Müllen, Klaus2, Author              
List, E. J. W., Author
Affiliations:
1Univ Wuppertal, D-42097 Wuppertal, Germany, ou_persistent22              
2MPI for Polymer Research, Max Planck Society, ou_1309545              

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 Abstract: Polyfluorenes are possibly the most attractive class of conjugated polymers for blue polymer light emitting devices. Derivatives with dendron side chains have been found to significantly improve the color stability of the devices. Using a quasi-cw photoinduced absorption technique we present a qualitative and quantitative analysis of lifetimes and deactivation mechanisms for the triplet excited states in a dendronically substituted derivative. The triplet lifetimes increase by one order of magnitude in the dendronic derivative compared to those in a standard poly(dialkylfluorene), which has been characterized for comparison. The temperature dependence of triplet lifetimes is interpreted in terms of migration assisted deactivation of triplet excitations. We conclude that the dendrons inhibit the Dexter-transfers of triplet excitations between the polymer chains and so strongly hinder triplet migration. (C) 2003 American Institute of Physics.

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Language(s): eng - English
 Dates: 2003-10-01
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 57846
ISI: 000185421400057
Other: P-03-216
DOI: 10.1063/1.1603723
 Degree: -

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Title: The Journal of Chemical Physics
  Other : J. Chem. Phys.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Institute of Physics
Pages: - Volume / Issue: 119 (13) Sequence Number: - Start / End Page: 6904 - 6910 Identifier: ISSN: 0021-9606
CoNE: https://pure.mpg.de/cone/journals/resource/954922836226