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Radiative Decay of Excitons in Model Aggregates of π-Conjugated Oligomers

Published online by Cambridge University Press:  10 February 2011

Eric S. Manas  and
Frank C. Spano
Eric S. Manas
Affiliation:
Department of Chemistry, Temple University, Philadelphia, PA [email protected]
Frank C. Spano
Affiliation:
Department of Chemistry, Temple University, Philadelphia, PA [email protected]
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Abstract

Spontaneous emission from exciton states in an aggregate of π-conjugated oligomers is studied theoretically. Each oligomer is taken as a ring of N carbon atoms and is treated using a PPP Hamiltonian. Coulombic interactions between rings are treated to first order. The radiative decay rate γ from an exciton state in an aggregate of M aligned oligomers is superradiant, being M times faster than the decay rate of an isolated oligomer exciton. Inter-oligomer interactions have little effect on the exciton size and energy when the oligomer size N is large compared to the interoligomer spacing. However, when N is small, both the exciton size and energy are strongly affected by these interactions, leading to a markedly different N dependence for γ.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 277
Copyright
Copyright © Materials Research Society 1998

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