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Synthesis and Exciton Dynamics of Triplet Sensitized Conjugated Polymers

Andernach, R; Utzat, H; Dimitrov, SD; McCulloch, I; Heeney, M; Durrant, JR; Bronstein, H; (2015) Synthesis and Exciton Dynamics of Triplet Sensitized Conjugated Polymers. Journal of the American Chemical Society , 137 (32) pp. 10383-10390. 10.1021/jacs.5b06223. Green open access

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We report the synthesis of a novel polythiophene-based host-guest copolymer incorporating a Pt-porphyrin complex (TTP-Pt) into the backbone for efficient singlet to triplet polymer exciton sensitization. We elucidated the exciton dynamics in thin films of the material by means of Transient Absorption Spectrosopcy (TAS) on multiple time scales and investigated the mechanism of triplet exciton formation. During sensitization, singlet exciton diffusion is followed by exciton transfer from the polymer backbone to the complex where it undergoes intersystem crossing to the triplet state of the complex. We directly monitored the triplet exciton back transfer from the Pt-porphyrin to the polymer and found that 60% of the complex triplet excitons were transferred with a time constant of 1087 ps. We propose an equilibrium between polymer and porphyrin triplet states as a result of the low triplet diffusion length in the polymer backbone and hence an increased local triplet population resulting in increased triplet-triplet annihilation. This novel system has significant implications for the design of novel materials for triplet sensitized solar cells and upconversion layers.

Type: Article
Title: Synthesis and Exciton Dynamics of Triplet Sensitized Conjugated Polymers
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1021/jacs.5b06223
Publisher version: http://dx.doi.org/10.1021/jacs.5b06223
Language: English
Additional information: Copyright © 2015 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, copyright © American Chemical Society after peer review and technical editing by the publisher.To access the final edited and published work see: http://dx.doi.org/10.1021/jacs.5b06223. or This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Conjugated polymers, excitons, triplets, diffusion length, organic solar cells
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1477452
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