Excitation energy migration and transfer in a dye pair in PMMA

Abstract

Study of excitation energy transfer from acriflavine to rhodamine 6G in poly(methyl methacrylate) (PMMA) has been done at room temperature. Donor decay data are found to fit with the Förster function of energy transfer at all acceptor concentrations. However, at low acceptor concentrations the observed critical transfer distance is higher than the spectroscopically calculated value and decreases with increasing acceptor concentration and finally attains a constant value which agrees with the spectroscopic value. The results are explained on the basis of the Huber model for energy transfer (Phys. Rev. B 20 (1979) 2307, 5333).