Nonradiative heterofusion of excitons in doped organic molecular crystals

Abstract

The nonradiative heterofusion of a host exciton with a guest molecule electronic excitation resulting in a higher electronic neutral single excited state is examined theoretically in the doped organic molecular crystals. The heterofusion process is treated as a nonradiative spontaneous multi-lattice phonon transition of the crystal from the electronic double excited initial state to the electronic single excited final state under the action of the interaction between the host molecules and the guest molecule. Two heterofusion channels are considered: the first one resulting in a higher electronic excited state of the guest molecule and the second one resulting in a higher host exciton state. The corresponding rate constants are calculated and discussed within the framework of the first order time dependent perturbation theory.