Charge transfer induced local Frenkel exciton states in naphthalene crystals heavily doped with durene

Absorption and luminescence spectra of durene-doped naphthalene crystals are reported for different dopant concentrations. New impurity-induced absorption bands are interpreted as charge transfer induced local Frenkel exciton states. The results of theoretical calculations, performed (without invoking any adjustable parameters) for a series of finite model clusters are in very good agreement with experiment and support this interpretation.