Interaction between Pyrene and Perylene in Solid State

The emission spectra of solid solutions of pyrene and perylene in benzene and of mixed crystals of pyrene and perylene were investigated. The dependence of these spectra on the concentration of pyrene and perylene, on temperature and on the excitation wavelength was determined. The results for solid solutions showed clearly that there is an interaction between pyrene excimer and perylene which gives rise to a new emission spectrum. These results also helped us to interpret the emission spectra of mixed crystals of pyrene and perylene.