Abstract
Time-resolved spectra and luminescence decay time in pyrene crystals have been studied by a time-correlated photon-counting technique over the temperature range 295−136 K (above the phase-transition point). Transient free-exciton luminescence is observed as well as thermally activated free-exciton luminescence. The rate of decay of transient free-exciton luminescence σ is proportional to exp(− E B/ kT, where k is the Boltzmann constant and T the temperature. The ST barrier height E B is found to be 260 cm −1. The ratio of the ST barrier height against the exciton bandwidth is found to be 0.1. The lower bound of the time required for excitons to tunnel through the ST barrier is estimated to be 36 ps.
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