Abstract
We have extended our study of the magnetic field dependence of monomer ( M M) and excimer ( I D) delayed fluorescence of aromatics in fluid solution. I M and I D show a monotonic decrease with increasing field strength at room temperature in agreement with theoretical predictions. At lower temperatures both I M and I D show an initial increase followed by a monotonic decrease. This marked temperature dependence can be attributed to a “freezing-out” of the effect of molecular motion on the field effect. At even lower temperatures the field effect curves of I M and I D start to diverge. Two models have been proposed to explain the mechanism of excimer formation in triplet—triplet annihilation. Qualitatively at least the divergence can be rationalized in terms of both models.
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