Simultaneous energy transfer from excited monomer and excimer pyrene molecules

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Abstract
Measurements have been made of the excited monomer and excimer fluorescence intensities of pyrene when rubrene, 9,10-diphenylanthracene and perylene are used as energy acceptors. For the first time a binary system is analysed where both donor species transfer energy with comparable efficiencies. Some comments on the boundary conditions that must be applied to the differential equations are presented to clarify the problems involved. The rate constants for the energy transfer obtained from steady-state measurements and decay curves compare well with theoretical predictions. For the pyrene concentrations used there is no need to invoke energy-migration effects to interpret the results.

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