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Photoexcitation Dynamics In Polymeric Heterostructures

Published online by Cambridge University Press:  10 February 2011

G. Bongiovanni ,
S. Destri ,
A. Mura ,
A. Piaggi  and
R Tubino
G. Bongiovanni
Affiliation:
Dipartimento di Scienze Fisiche, UniversitA di Cagliari, Cagliari, 09124 Italy.
S. Destri
Affiliation:
Istituto di Chimica delle Macromolecole-C.N.R., Via Bassini 15, Milano, 20133 Italy.
A. Mura
Affiliation:
Dipartimento di Scienze Fisiche, UniversitA di Cagliari, Cagliari, 09124 Italy.
A. Piaggi
Affiliation:
Istituto di Matematica e Fisica, UniversitA di Sassari, Sassari, 07100 Italy.
R Tubino
Affiliation:
Dipartimento di Fisica, UniversitA di Milano, Milano, 20133 Italy
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Abstract

We investigate the dynamics of photoexcitations in thiophene-based copolymers by site-selective and time-resolved photoluminescence spectroscopies. We attribute the large Stokes-shift observed between the absorption and luminescence peaks to spectral relaxation of excitons within an inhomogeneously broadened density of states. The non exponential decay of the photoluminescence intensity is explained through the interplay between spectral diffusion, thermally activated jumps and slow transfer to non nearest neighbour sites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 413: Symposium W – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials III , 1995 , 589
Copyright
Copyright © Materials Research Society 1996

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References

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