Experimental determination of the triplet exciton intermolecular interaction matrix element and the exciton-phonon scattering rate in molecular crystals

An experiment method involving the temperature dependence of the intensity of trap emission is employed to determine the sign and magnitude of the nearest-neighbor intermolecular interaction matrix responsible for the triplet exciton transport and the number of wave vector states comprising the triplet exciton band in 1,2,4,5-tetrachlorobenzene. These quantities are utilized to obtain T₂(T) from previously reported ESR data. Using T₂(T) which is related to the rate of exciton inelastic scattering, the excition transport coherence length is calculated.