the method of electrophotographically manufacturing a luminescent screen assembly on a substrate for use within a crt , according to the present invention , includes the steps of : forming a conductive layer on the substrate ; overcoating the conductive layer with a photoconductive solution comprising an organic polymeric material , a suitable photoconductive dye , a plasticizer and a solvent to form a photoconductive layer ; and , then , establishing an electrostatic charge on the photoconductive layer . selected areas of the photoconductive layer are exposed to visible light to affect the charge thereon , and the photoconductive layer is developed with charged screen structure material . the improved method utilizes a dialkyl phthalate plasticizer which is selected from the group consisting of dibutylphthalate , dioctylphthalate , and diundecylphthalate .