Abstract
The steady-state/transient fluorescence spectroscopy was used to demonstrate that the dynamics of singlet exciton fission in amorphous rubrene were temperature-dependent (50–300K). Based on the traditional three-state model of singlet fission, time-resolved fluorescence decay curves measured at different temperatures could be well fitted by using a set of rate equations. The variations of specific rate constants were consistent with the conventional Arrhenius-type, thermally activated process. Additionally, the magnetic field effect of photoluminescence was apparently suppressed at low temperatures. All these findings offer clear evidence that the amorphous rubrene solid undergoes thermally activated singlet exciton fission due to the endothermic nature of fission process in rubrene.
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