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Optical Properties and Photoexcitations in Regularly Alternating Conjugated Copolymers

Published online by Cambridge University Press:  16 February 2011

R. Tubino ,
C. Botta ,
S. Destri ,
W. Porzio  and
L. Rossi
R. Tubino
Affiliation:
Istituto di Matematica e Fisica, Università di Sassari, Via Vienna 2,07100, Sassari, Italy
C. Botta
Affiliation:
Istituto di Chimica delle Macromolecole, CNR, Via Bassini 15,20133, Milano, Italy
S. Destri
Affiliation:
Istituto di Chimica delle Macromolecole, CNR, Via Bassini 15,20133, Milano, Italy
W. Porzio
Affiliation:
Istituto di Chimica delle Macromolecole, CNR, Via Bassini 15,20133, Milano, Italy
L. Rossi
Affiliation:
Dipartimento di Fisica “A. Volta”, Università di Pavia, Via Bassi 6, 27100, Pavia, Italy
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Abstract

We report in this short paper a preliminary account on the design, preparation, optical characterization and photoexcitation of a class of novel conjugated polymers consisting of regularly alternating thiophene and benzene sequences, which Might represent Models for one-dimensional superlattices. Optical absorption and emission spectra suggest that the barriers produced by the phenylene Moieties do not interrupt the conjugation but can produce localization effects. Resonant Raman spectra indicate that a selective response of the thiophene Moiety occurs upon excitation with visible light. Moreover these Measurements confirm the presence of a confinement on the thiophene blocks, while the biphenil Moiety does not appear to feel the energy barrier and behaves as the corresponding polymer poly (paraphenylene) (PPP). CW photomodulation spectra show that the formation of long-lived bipolarons takes place only if the thienylenic Moiety is long enough to accomodate the lattice distortion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 328: Symposium Q – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1993 , 673
Copyright
Copyright © Materials Research Society 1994

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References

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