ORGANIC PHOTOCONDUCTIVE (OPC) DEVICES INCORPORATING BISARYLIMIDAZOLE PERINONE PIGMENTS

The synthesis and purification of a series of four bisarylimidazole perinone photoconductive pigments is described. The optical and electrical properties of negatively charged dual-layer photoreceptors incorporating a thin 0.20-mu-m evaporated film of the bisarylimidazole perinones and a thick (15-mu-m) hole transport layer were determined. The photoreceptor devices exhibit low dark decay, excellent cyclic stability and high white light photosensitivity. An improvement in the spectral response above 600 nm was obtained by varying the chemical structure of the perinone.