Magnetic fields on a hyperfine scale can modulate dye-sensitized delayed fluorescence from organic crystals at room temperature. This hyperfine modulation (HFM) has been found to depend on the orientation of the field in the ac plane of rhodamine-B-sensitized anthracene. The anisotropy can be explained by an electron-hole spin-spin interaction in the dye-anthracene charge-transfer state formed following photoexcitation of the sensitizing dye on the crystal surface. Increased dye concentration broadens the field-dependence curve, presumably as a result of dye-aggregation effects. HFM has also been found in other dye-crystal systems.
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Groff et al. (1974) studied this question.
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