Abstract
The time-resolved electron spin resonance (TR-ESR) method has been applied to the mobile triplet excited state of anthracene-dimethylpyromellitimide (A/DMPT) charge-transfer crystals at room temperature. The spin Hamiltonian parameters have been determined to be D=0.0693 cm −1, E=0.0081 cm −1 and g=2.0023, respectively. The line-shape analysis in the single- crystal experiments shows Loretnzian line shape as a result of the motional narrowing (the narrow line-width of Δ H msl=0.3 mT), which means the observed triplet state originating from the mobile triplet exciton. The relative populations (polarization) of each M S sublevel in the triplet state have been determined to be P X =0.6, P Y =0.4, P Z =0.0 from the spectral simulation. The TR-ESR method detects the strongly polarized triplet state directly, giving the intrinsic nature of the triplet state as well as the time profiles and its spin dynamics.
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