DOI: 10.1063/1.470597. Direct observation of the intersystem crossing in poly(3-octylthiophene)

Direct observation of the intersystem crossing in poly(3-octylthiophene)

10.1063/1.470597

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Using subpicosecond photoinduced absorption, we monitor the evolution of singlet excitons in solutions of regiorandom poly(3-octylthiophene) (P3OT), regioregular poly(3-hexylthiophene) (P3HT), and a well-defined α-oligothiophene with 12 repeat units (T12). We find a luminescence lifetime of 500 ps, and we observe the intersystem crossing from the singlet manifold to the triplet manifold, with a rate constant of k−1ISC=1.2 ns. By measuring the quantum efficiency of luminescence, we estimate an intrinsic lifetime of 2 ns for the singlet excitons, and a nonradiative decay rate of k−1nr=1.5 ns. We find no difference in the intersystem crossing time for the different thiophene derivatives, implying the intersystem crossing rate is determined primarily by the relatively large spin–orbit interaction due to the sulfur heteroatom and not by chain defects, chain ends, or effects due to the side groups. In addition, we find that for t&lt;50 ps a fraction of the photoexcitations undergo one-dimensional diffusion limited recombination.

Bibliography

Kraabel, B., Moses, D., & Heeger, A. J. (1995). Direct observation of the intersystem crossing in poly(3-octylthiophene). The Journal of Chemical Physics, 103(12), 5102â5108.

Authors 3

B. Kraabel (first)
D. Moses (additional)
A. J. Heeger (additional)

References 33 Referenced 123

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 8:13 a.m.)
Deposited	1 year, 6 months ago (Feb. 10, 2024, 2:25 p.m.)
Indexed	4 weeks, 2 days ago (Aug. 7, 2025, 4:41 p.m.)
Issued	29 years, 11 months ago (Sept. 22, 1995)
Published	29 years, 11 months ago (Sept. 22, 1995)
Published Print	29 years, 11 months ago (Sept. 22, 1995)

Funders 0

None

BibTeX

@article{Kraabel_1995, title={Direct observation of the intersystem crossing in poly(3-octylthiophene)}, volume={103}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.470597}, DOI={10.1063/1.470597}, number={12}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Kraabel, B. and Moses, D. and Heeger, A. J.}, year={1995}, month=sep, pages={5102–5108} }

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