Journal article 560 views
Synthesis and Exciton Dynamics of Triplet Sensitized Conjugated Polymers
,
Iain McCulloch,
Martin Heeney,
James R. Durrant,
Hugo Bronstein
Journal of the American Chemical Society, Volume: 137, Issue: 32, Pages: 10383 - 10390
Swansea University Author:
Stoichko Dimitrov
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DOI (Published version): 10.1021/jacs.5b06223
Abstract
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 Absorptio...
| Published in: | Journal of the American Chemical Society |
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| ISSN: | 0002-7863 1520-5126 |
| Published: |
2015
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa31797 |
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| Abstract: |
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. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
32 |
| Start Page: |
10383 |
| End Page: |
10390 |