Weiss, L. R., Bayliss, S. L. , Kraffert, F., Thorley, K. J., Anthony, J. E., Bittl, R., Friend, R. H., Rao, A., Greenham, N. C. and Behrends, J. (2017) Strongly exchange-coupled triplet pairs in an organic semiconductor. Nature Physics, 13(2), pp. 176-181. (doi: 10.1038/nphys3908)
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Abstract
From biological complexes to devices based on organic semiconductors, spin interactions play a key role in the function of molecular systems. For instance, triplet-pair reactions impact operation of organic light-emitting diodes as well as photovoltaic devices. Conventional models for triplet pairs assume they interact only weakly. Here, using electron spin resonance, we observe long-lived, strongly interacting triplet pairs in an organic semiconductor, generated via singlet fission. Using coherent spin manipulation of these two-triplet states, we identify exchange-coupled (spin-2) quintet complexes coexisting with weakly coupled (spin-1) triplets. We measure strongly coupled pairs with a lifetime approaching 3 μs and a spin coherence time approaching 1 μs, at 10 K. Our results pave the way for the utilization of high-spin systems in organic semiconductors.
| Item Type: | Articles |
|---|---|
| Additional Information: | L.R.W. thanks the Gates-Cambridge Trust and Winton Programme for the Physics of Sustainability. This work was supported by the Freie Universität Berlin within the Excellence Initiative of the German Research Foundation. We also acknowledge support from the Engineering and Physical Sciences Research Council Grants No. EP/G060738/1. We thank A. D. Chepelianskii for helpful input. |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Bayliss, Dr Sam |
| Authors: | Weiss, L. R., Bayliss, S. L., Kraffert, F., Thorley, K. J., Anthony, J. E., Bittl, R., Friend, R. H., Rao, A., Greenham, N. C., and Behrends, J. |
| College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
| Journal Name: | Nature Physics |
| Publisher: | Nature Research |
| ISSN: | 1745-2473 |
| ISSN (Online): | 1745-2481 |
| Published Online: | 17 October 2016 |
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