Electrophotographic photoreceptor

摘要

An electrophotographic photoreceptor comprising an electroconductive support having thereon a layer containing a charge carrier-transporting compound and a charge carrier-generating compound or having thereon a layer containing a charge carrier-transporting compound and a layer containing a charge carrier-generating compound, wherein the photoreceptor contains a tetrakisazo compound of the following formula (I) as the charge carrier-generating compound: <IMAGE> (I) wherein Ar1, Ar2, Ar3, Ar4, Ar5 and Ar6, which may be the same or different, each represents an arylene group, a divalent condensed polycyclic aromatic group or a divalent heterocyclic aromatic group; A represents <IMAGE> <IMAGE> <IMAGE> +TR <IMAGE> X represents an atomic group necessary to form an aromatic ring or heterocyclic ring condensed with the benzene ring of the formula having the hydroxyl group and Y bonded thereto; Y represents <IMAGE> R1 represents an alkyl group or a phenyl group; R2 represents a hydrogen atom, a lower alkyl group, a carbamoyl group, a carboxyl group, an alkoxycarbonyl group, an aryloxycarbonyl group or an amino group; R3 represents an alkyl group, an aromatic group or a heterocyclic aromatic group; R4 and R5, which may be the same or different, each represents a hydrogen atom, an alkyl group, an aromatic group or a heterocyclic aromatic group, provided that both R4 and R5 are not simultaneously hydrogen atoms; when Y represents <IMAGE> R5 is not a hydrogen atom; and B represents a divalent aromatic hydrocarbon residue or a divalent heterocyclic group containing a nitrogen atom(s) in the ring.