Electrophotographic photoreceptor, process cartridge, and image forming apparatus

An electrophotographic photoreceptor comprising:

• a conductive substrate;
• an undercoating layer that is disposed on the conductive substrate;
• and
• a photosensitive layer that is disposed on the undercoating layer,
• wherein the undercoating layer contains one perinone compound represented by Formula (1) shown below, one perinone compound represented by Formula (2) shown below, and one acceptor compound shown below:
• in Formula (1), R11, R12, R13, R14, R15, R16, R17, and R18 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aralkyl group, an aryl group, an aryloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkoxycarbonylalkyl group, an aryloxycarbonylalkyl group, or a halogen atom, R11 and R12 may be linked to each other to form a ring, R12 and R13 may be linked to each other to form a ring, R13 and R14 may be linked to each other to form a ring, R15 and R16 may be linked to each other to form a ring, R16 and R17 may be linked to each other to form a ring, and R17 and R18 may be linked to each other to form a ring;
• in Formula (2), R21, R22, R23, R24, R25, R26, R27, and R28 each independently represent a hydrogen atom, an alkyl group, an alkoxy group, an aralkyl group, an aryl group, an aryloxy group, an alkoxycarbonyl group, an aryloxycarbonyl group, an alkoxycarbonylalkyl group, an aryloxycarbonylalkyl group, or a halogen atom, R21 and R22 may be linked to each other to form a ring, R22 and R23 may be linked to each other to form a ring, R23 and R24 may be linked to each other to form a ring, R25 and R26 may be linked to each other to form a ring, R26 and R27 may be linked to each other to form a ring, and R27 and R28 may be linked to each other to form a ring;
• and
• in Formula (6), R61, R62, R63, R64, R65, R66, R67, and R68 each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, an aralkyl group, an aryl group, an aryloxy group, a nitro group, a carboxy group, or a hydroxy group.