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          Institute: MPI für Polymerforschung     Collection: MPI Polymerforschung     Display Documents

ID: 57846.0, MPI für Polymerforschung / MPI Polymerforschung
Long lived photoexcitation dynamics in a dendronically substituted poly(fluorene)
Authors:Pogantsch, A.; Wenzl, F. P.; Scherf, Ullrich; Grimsdale, Andrew C.; Müllen, Klaus; List, E. J. W.
Date of Publication (YYYY-MM-DD):2003-10-01
Title of Journal:Journal of Chemical Physics
Journal Abbrev.:J. Chem. Phys.
Issue / Number:13
Start Page:6904
End Page:6910
Review Status:not specified
Audience:Not Specified
Abstract / Description: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.
Comment of the Author/Creator:Date: 2003, OCT 1
External Publication Status:published
Document Type:Article
Affiliations:MPI für Polymerforschung
External Affiliations:Graz Univ Technol, Inst Solid State Phys, Christian Doppler Lab Adv Funct Mat, A-8010 Graz, Austria.; Berg Univ Gesamthsch Wuppertal, Dept Chem 9, D-42097 Wuppertal, Germany.; Inst Nanostruct Mat & Photon, Christian Doppler Lab Adv Funct Mat, A-8160 Graz, Austria.
Identifiers:ISI:000185421400057 [ID No:1]
ISSN:0021-9606 [ID No:2]
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