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, 548 190-194. doi:10.1016/j.tsf.2013.09.065


Author Vamvounis, George
Pivrikas, Almantas
Shaw, Paul E.
Burn, Paul L.
Title Thin film properties of triphenylamine-cored dendrimers: A molecular approach to control aggregation
Journal name Thin Solid Films   Check publisher's open access policy
ISSN 0040-6090
1879-2731
Publication date 2013-12-02
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.tsf.2013.09.065
Volume 548
Start page 190
End page 194
Total pages 5
Place of publication Lausanne, Switzerland
Publisher Elsevier S.A.
Language eng
Subject 2504 Electronic, Optical and Magnetic Materials
2505 Materials Chemistry
2506 Metals and Alloys
2508 Surfaces, Coatings and Films
3110 Surfaces and Interfaces
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.
Keyword Aggregation
Dendrimers
Organic Field Effect Transistors
Organic Light Emitting Diodes
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Chemistry and Molecular Biosciences
 
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