Electronic energy transfer efficiency of mixed solutions of the donor–acceptor pairs: coumarin derivatives—acridine orange

Abstract

Excitation energy transfer between coumarin derivatives and acridine orange (AO) in solutions of two different viscosities has been studied. The rate constants of the electronic energy transfer ( k ET) and critical radius ( R 0) were determined for coumarin derivatives as donors and AO as acceptor. The obtained values of k ET and R 0 indicate that dipole–dipole interaction between D–A pairs is responsible for the energy transfer mechanism. The experimental data of energy transfer efficiency are well described by the Förster theory.