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

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 Zusammenfassung: 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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Sprache(n): eng - English
 Datum: 2003-10-01
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: -
 Identifikatoren: eDoc: 57846
ISI: 000185421400057
Anderer: P-03-216
DOI: 10.1063/1.1603723
 Art des Abschluß: -

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Titel: The Journal of Chemical Physics
  Andere : J. Chem. Phys.
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Woodbury, N.Y. : American Institute of Physics
Seiten: - Band / Heft: 119 (13) Artikelnummer: - Start- / Endseite: 6904 - 6910 Identifikator: ISSN: 0021-9606
CoNE: https://pure.mpg.de/cone/journals/resource/954922836226