Energy Transfer in Perylene Doped Anthracene Crystals

Abstract

Time resolved spectroscopy with ultraviolet light excitation was used to investigate host sensitized energy transfer in perylene doped anthracene crystals. The UV excitation leads to a wavelength dependence of the host fluorescene decay time due to the effects of reabsorption. The time resolved spectroscopy results are shown to be consistent with the generalized random walk model for energy transfer with the same exciton hopping time found previously for tetracene doped anthracene but a smaller capacity. It is speculated that the latter is due to a smaller, more symmetric extended trapping region around each impurity molecule.