Electrophotographic photoreceptor

An electrophotographic photoreceptor comprising a conductive support having thereon a light-sensitive layer, said light-sensitive layer containing hydroxygallium phthalocyanine crystals as a charge generating material and a compound represented by formula (XVII), (XVIII), (XIX) or (XX) as a charge transporting material:

• ##STR31## wherein R.sub.23 and R.sub.24 each represent a hydrogen atom, an alkyl group or an aryl group;
• Y represents --(C(CH.sub.3).sub.2)--, --(CH.sub.2).sub.t --, wherein t represents an integer of from 1 to 5, --(OCH.sub.2 CH.sub.2).sub.t --, wherein t represents an integer of from 1 to 5, --CH.dbd.CH--, --CO(CH.sub.2).sub.2 --, --CO(CH.sub.2).sub.3 --, a cyclobenzylidene group or a cyclohexylidene group;
• ##STR32## wherein R.sub.25, R.sub.26, and R.sub.27 each represent a hydrogen atom, an alkyl group, a substituted or unsubstituted aryl group or an aralkyl group;
• ##STR33## wherein R.sub.28 and R.sub.29 each represent a hydrogen atom, a halogen atom, an alkyl group or a substituted or unsubstituted aryl group;
• and R.sub.30 and R.sub.31 each represent a hydrogen atom, an alkyl group or a substituted or unsubstituted aryl group, or R.sub.30 and R.sub.31 are taken together to form an atomic group forming a condensed carbon ring;. ##STR34## wherein R.sub.32, R.sub.33, R.sub.34, and R.sub.35 each represent a hydrogen atom, an alkyl group, a substituted amino group or an aryl group;
• and u represents 0 or 1.

An electrophotographic photoreceptor comprising a conductive support having thereon a light-sensitive layer containing hydroxygallium phthalocyanine crystals having distinct diffraction peaks at degrees of the Bragg angle (2.theta..+-.0.2) in the X-ray diffraction spectrum prepared by treating hydroxygallium phthalocyanine with a solvent selected from the group consisting of amides, ketones, alcohols, amines, aromatic alcohols and polyhydric alcohols and a benzidine compound represented by formula (II):

• ##STR35## wherein R.sub.5 represents a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom;
• R.sub.6 and R.sub.7 each represents a hydrogen atom, an alkyl group, an alkoxy group, a halogen atom, or a substituted amino group;
• and p and q each represents 0, 1 or 2, or a tetraaryl-m-phenylenediamine compound represented by formula (III):
• ##STR36## wherein R.sub.8, R.sub.9, and R.sub.10 each represents a hydrogen atom, an alkyl group, an alkoxy group, a substituted or unsubstituted aryl group or an aralkyl group, as a charge transporting material.

An electrophotographic photoreceptor comprising a conductive supporting having thereon a light-sensitive layer, said light-sensitive layer containing hydroxygallium phthalocyanine crystals having distinct diffraction peaks at degrees of the Bragg angle (2.theta..+-.0.2) in the X-ray diffraction spectrum prepared by treating hydroxygallium phthalocyanine with a solvent selected from the group consisting of amides, ketones, alcohols, amines, aromatic alcohols and polyhydric alcohols and a benzidine compound represented by formula (XVII), (XVIII), (XIX) or (XX) as a charge transporting material:

• ##STR39## wherein R.sub.23 and R.sub.24 each represents a hydrogen atom, an alkyl group or an aryl group;
• Y represents --(C(CH.sub.3).sub.2)--, --(CH.sub.2).sub.t --, wherein t represents an integer of from 1 to 5, --(OCH.sub.2 CH.sub.2).sub.t, wherein t represents an integer of from 1 to 5, --CH.dbd.CH--, --CO(CH.sub.2).sub.2, --CO(CH.sub.2).sub.3 --, a cyclobenzylidene group or a cyclohexylidene group;
• ##STR40## wherein R.sub.25, R.sub.26, and R.sub.27 each represents a hydrogen atom, an alkyl group, a substituted or unsubstituted aryl group or an aralkyl group;
• ##STR41## wherein R.sub.28 and R.sub.29 each represents a hydrogen atom, a halogen atom, an alkyl group or a substituted or unsubstituted aryl group;
• and R.sub.30 and R.sub.31 each represents a hydrogen atom, an alkyl group or a substituted or unsubstituted aryl group, or R.sub.30 and R.sub.31 are taken together to form an atomic group forming a condensed carbon ring;
• ##STR42## wherein R.sub.32, R.sub.33, R.sub.34 and R.sub.35 each represents a hydrogen atom, an alkyl group, a substituted amino group or an aryl group;
• and u represents 0 or 1.