Thin film properties of triphenylamine-cored dendrimers: a molecular approach to control aggregation

Vamvounis, George, Pivrikas, Almantas, Shaw, Paul E., and Burn, Paul L. (2013) Thin film properties of triphenylamine-cored dendrimers: a molecular approach to control aggregation. Thin Solid Films, 548. pp. 190-194.

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Abstract

The solid-state photophysical and charge transport properties of two first-generation dendrimers are presented. The dendrimers are comprised of a triphenylamine core, dendrons containing a phenyl branching unit with thiophene (Dendrimer 1) or bithiophene (Dendrimer 2) moieties, and dodecyl surface groups. For Dendrimer 1, the excited state is located within the center of the dendrimer giving rise to a moderate solid-state photoluminescence quantum yield (Φpl) (0.13) and significant charge trapping, with both observations due to the degree of overlap of the main electroactive chromophores on adjacent dendrimers. For Dendrimer 2, the excited state is located within the dendron and in the solid-state this leads to a strongly red-shifted and weakened emission (Φpl ~ 0.02) due to strong intermolecular chromophore interactions. For films of Dendrimer 2 the charge mobility was higher than Dendrimer 1 but was still limited by a low density of strongly interacting electroactive chromophores. The pronounced difference between the solid-state properties of the two dendrimers is simply engineered by the addition of an extra thiophene in each of the dendrons.

Item ID: 31995
Item Type: Article (Research - C1)
ISSN: 1879-2731
Keywords: dendrimers; aggregation; organic light emitting diodes; organic field effect transistors
Funders: Australian Research Council (ARC), University of Queensland (UQ)
Projects and Grants: ARC Australian Research Fellowship DP1095404, ARC Federation Fellow FF0668728
Date Deposited: 16 Apr 2014 04:37
FoR Codes: 03 CHEMICAL SCIENCES > 0303 Macromolecular and Materials Chemistry > 030306 Synthesis of Materials @ 25%
03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030503 Organic Chemical Synthesis @ 25%
03 CHEMICAL SCIENCES > 0303 Macromolecular and Materials Chemistry > 030303 Optical Properties of Materials @ 50%
SEO Codes: 85 ENERGY > 8505 Renewable Energy > 850504 Solar-Photovoltaic Energy @ 100%
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