Control of mobility in molecular organic semiconductors by dendrimer generation

Lupton, J. M., Samuel, I. D. W., Beavington, R., Frampton, M. J., Burn, P. L. and Bassler, H. (2001) Control of mobility in molecular organic semiconductors by dendrimer generation. Physical review. B, Condensed matter and materials physics, 63 15: 155206-1-155206-8. doi:10.1103/PhysRevB.63.155206

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Author Lupton, J. M.
Samuel, I. D. W.
Beavington, R.
Frampton, M. J.
Burn, P. L.
Bassler, H.
Title Control of mobility in molecular organic semiconductors by dendrimer generation
Journal name Physical review. B, Condensed matter and materials physics   Check publisher's open access policy
ISSN 0163-1829
Publication date 2001
Sub-type Article (original research)
DOI 10.1103/PhysRevB.63.155206
Open Access Status File (Publisher version)
Volume 63
Issue 15
Start page 155206-1
End page 155206-8
Total pages 8
Place of publication New York
Publisher American Physical Society
Language eng
Subject 02 Physical Sciences
Abstract Conjugated dendrimers are of interest as novel materials for light-emitting diodes. They consist of a luminescent chromophore at the core with highly branched conjugated dendron sidegroups. In these materials, light emission occurs from the core and is independent of generation. The dendron branching controls the separation between the chromophores, We present here a family of conjugated dendrimers and investigate the effect of dendron branching on light emission and charge transport. We apply a number of transport measurement techniques to thin films of a conjugated dendrimer in a light-emitting diode configuration to determine the effect of chromophore spacing on charge transport. We find that the mobility is reduced by two orders of magnitude as the size of the molecule doubles with increased branching or dendrimer generation. The degree of branching allows a unique control of mobility by molecular structure. An increase in chromophore separation also results in a reduction of intermolecular interactions, which reduces the red emission tail in film photoluminescence. We find that the steady-state charge transport is well described by a simple device model incorporating the effect of generation, and use the materials to shed light on the interpretation of transient electroluminescence data. We demonstrate the significance of the ability to tune the mobility in bilayer devices, where a more balanced charge transport can be achieved.
Keyword Physics, Condensed Matter
Charge-carrier Transport
Conjugated Polymers
Transient Electroluminescence
Poly(p-phenylene Vinylene)
Hole Transport
Device Model
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Organic Photonics and Electronics
School of Chemistry and Molecular Biosciences
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Citation counts: TR Web of Science Citation Count  Cited 89 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 19 Sep 2007, 16:23:55 EST