Photoelectric properties of a self-ordered molecular disperse structure based on a polar-dye solution in a liquid-crystal matrix

An analysis of photoluminescence spectra and nonlinear optical properties revealed the effect of polar-dye aggregates in a liquid-crystal matrix on the formation of an ordered molecular disperse structure. As the dye is aggregated in the liquid-crystal matrix, there is a certain concentration of the dye below which only second-harmonic generation occurs upon laser excitation at 1064 nm, while above this concentration, this generation occurs in combination with intense two-photon-induced photoluminescence. An applied electric field or intense ultraviolet illumination is found to change both the molecule orientation and the conditions of molecule aggregation.