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Oriented Luminescent Nanostructures From Single Molecules Of Conjugated Polymers

Published online by Cambridge University Press:  15 February 2011

Adosh Mehta ,
Pradeep Kumar ,
Jie Zheng ,
Robert M. Dickson ,
Bobby Sumpter  and
Michael D. Barnes
Adosh Mehta
Affiliation:
Life Sciences Division, Oak Ridge National Laboratory, Oak Ridge TN 37830
Pradeep Kumar
Affiliation:
Department of Chemistry, University of Tennessee, Knoxville, TN 37996-1600
Jie Zheng
Affiliation:
School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta GA 30332-0400
Robert M. Dickson
Affiliation:
School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta GA 30332-0400
Bobby Sumpter
Affiliation:
Computer Sciences and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge TN 37830
Michael D. Barnes
Affiliation:
Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge TN 37830-6142
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Abstract

Dipole emission pattern imaging experiments on single chains of common conjugated polymers (solubilized poly phenylene vinylenes) isolated by ink-jet printing techniques have revealed surprising uniformity in transition moment orientation perpendicular to the support substrate. In addition to uniform orientation, these species show a number of striking differences in photochemical stability, polarization anisotropy,[1] and spectral signatures[2] with respect to similar (well-studied) molecules dispersed in dilute thin-films. Combined with molecular mechanics simulation, these results point to a structural picture of a folded macromolecule as a highly ordered cylindrical nanostructure whose long-axis (approximately collinear with the conjugation axis) is oriented, by an electrostatic interaction, perpendicular to the coverglass substrate. These results suggest a number of important applications in nanoscale photonics and molecular-scale optoelectronics.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 771: Symposium L – Organic and Polymeric Materials and Devices , 2003 , L9.8
Copyright
Copyright © Materials Research Society 2003

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