Observation of fluorescence intensity dips in rubrene crystals under magnetic fields, indicating triplet pair generation.
Magnetic field dependence of fluorescence from monoclinic rubrene crystals was observed under the magnetic fields up to 10 T. At several magnetic fields, dips, which are a decrease of the fluorescence intensity at a specific magnetic field, were observed, indicating that exchange-coupled triplet pairs are generated by singlet fission. The structures of the two distinct exchange-coupled triplet pairs are discussed with dip positions.
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Nakamura et al. (2026) studied this question.
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