The fluorescence efficiency of tetracene single crystals may be enhanced by as much as 38% in a magnetic field $H>2000$ G. The enhancement is anisotropic with respect to the orientation of H in the ab plane. It is shown that a magnetically sensitive coupling of singlet states to a double-triplet-exciton state (T₁T₁) at {~}2.40 eV is an important channel for radiationless decay in crystalline tetracene above 160^∘{}K.
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Geacintov et al. (1969) studied this question.
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