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Thermally activated delayed fluorescence (TDF) emission from C 70 and 1,2-C 70 H 2 has been time-resolved to provide thermodynamic and kinetic information on excited electronic states. The energy gap between S 1 and T 1 states was deduced from the temperature dependence of initial TDF intensities and independently from the ratio of TDF intensity to time-integrated prompt fluorescence. S 1 −T 1 gaps were found to be approximately 2470 cm -1 for C 70 and 2180 cm -1 for 1,2-C 70 H 2, with relative uncertainties of 2−3%. Time-resolved TDF measurements from fullerene samples immobilized in PMMA films revealed lifetimes for triplet state decay unaffected by bimolecular deactivation processes. The intrinsic triplet lifetimes at 298 K were found from both TDF and transient absorption measurements to be 24.5 ± 1.5 ms for C 70 and 1.95 ± 0.1 ms for 1,2-C 70 H 2 .
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Bachilo et al. (2000) studied this question.
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