Journal
NATURE PHYSICS
Volume 13, Issue 2, Pages 176-181Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHYS3908
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Funding
- Freie Universitat Berlin within the Excellence Initiative of the German Research Foundation
- Engineering and Physical Sciences Research Council [EP/G060738/1]
- EPSRC [EP/M005143/1, EP/G060738/1, EP/M006360/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1208395, EP/M006360/1, EP/M005143/1, EP/G060738/1] Funding Source: researchfish
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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 Its and a spin coherence time approaching 1 mu s, at 10 K. Our results pave the way for the utilization of high-spin systems in organic semiconductors.
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