Abstract
From an analysis of the internal rate parameters of the pyrene excimer in solution in propylene glycol, isopropanol and other solvents it is concluded that (i) the radiative transition rate ( k FD) 0, normalized to a medium of n=1, is independent of the solvent, (ii) the temperature-independent radiationless transition rate k ID 0 is due to intersystem crossing, and (iii) the temperature-dependent radiationless transition rate k ID T is due to internal conversion, induced by thermally-activated molecular motion which is subject to viscous restraint by the solvent. For the crystal pyrene excimer the radiative transition rate = ( k FD) 0, k ID 0 = 0, and k ID T is due to intersystem crossing.
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