Exciton migration and energy transfer in crystalline pyrene

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Abstract
The temperature dependence of the rate of energy transfer from pyrene to rubicen and to coronen in multicrystalline pyrene films is investigated. The activation energy of the transfer process depends strongly on the nature of the guest molecule. A two stage model is described, consisting of a hopping process of the excimeric exciton with successive transfer of the excitation energy to the guest molecule which lies close to one of the excimers. For the hopping process a semiclassical and a quantum mechanical treatment are given. The temperature dependence of the second stage is treated assuming a dipole–dipole interaction. The experimental results are compared with those predicted by the model.

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