Abstract
The magnetic field dependence of host as well as of guest delayed fluorescence in tetracene-doped anthracene crystals was measured. The position of the high field level-crossing resonances for heterofusion indicate that tetracene molecules enter the anthracene lattice substitutionally. The changes in intensity of the resonance peaks with tetracene concentration indicate that the tetracene-anthracene triplet excitation annihilation gives rise to both tetracene and anthracene delayed fluorescence.
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