Spin-triplet excitations commonly migrate through direct electron exchange between neighbouring molecules. Now, experiments show that back-and-forth interconversion between spin-triplet and spin-singlet states can significantly speed up triplet migration in organic crystals.
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Roberts, S. Singlet to triplet and back again. Nature Chem 7, 764–765 (2015). https://doi.org/10.1038/nchem.2356
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