A composition for a photo-conductive layer and an electron transferring complex system on a color CRT panel having 1-(p-diethylaminophenyl)-1,4,4-triphenyl-1,3-butadiene as an electron donor and a thioxanthene derivative as an electron acceptor in an organic binder dispersion system have not only a high electron transferring capability but also a high electron generating capability so that it is not necessary to add a separate electron generating material.