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Optical Properties and Dynamics of Molecular Excitons in Oligothiophenes

Published online by Cambridge University Press:  10 February 2011

R. Tubino ,
G. Bongiovanni ,
A. Mura ,
R. Bosisio ,
C. Botfa  and
G. Di Silvestrot
R. Tubino
Affiliation:
Dipartimento di Fisica, Università di Milano, via Celoria 16, 20133 Milano, Italy
G. Bongiovanni
Affiliation:
Dipartimento di Fisica, Università di Cagliari, via Ospedale 72,09124 Cagliari, Italy
A. Mura
Affiliation:
Dipartimento di Fisica, Università di Cagliari, via Ospedale 72,09124 Cagliari, Italy
R. Bosisio
Affiliation:
Istituto di Chimica delle Macromolecole (C.N.R.), via Bassini 15, 20133 Milano, Italy
C. Botfa
Affiliation:
Istituto di Chimica delle Macromolecole (C.N.R.), via Bassini 15, 20133 Milano, Italy
G. Di Silvestrot
Affiliation:
Dipartimento di Chimica, Università di Milano, via Venezian 21, 20133 Milano, Italy
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Abstract

CW absorption and emission spectra as well as time-resolved photoemission dynamics have been employed to detect the evolution of the first excited electronic states and the associated spectroscopical changes in passing from the isolated molecules to the aggregated state in thiophene oligomers. To this end a novel form of inclusion compound in PHTP in which the molecules are electronically decoupled in the solid state has been studied, thus avoiding the complications associated with the change in conformation occurring upon dissolution. The experimental data are interpreted in terms of the molecular exciton model.

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References

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