Electrophotographic photosensitive member, process cartridge, and image forming apparatus

An electrophotographic photosensitive member comprising a conductive substrate and a photosensitive layer, wherein

• the photosensitive layer is a single-layer photosensitive layer,
• the photosensitive layer contains at least a charge generating material, a hole transport material, an electron transport material, and a binder resin,
• the charge generating material includes a metal-free phthalocyanine,
• the hole transport material includes a triphenylamine derivative represented by a general formula (1) shown below, and
• the electron transport material includes a quinone derivative represented by a general formula (2) shown below,
• where in the general formula (1),
• R1, R2, and R3 each represent, independently of one another, an alkyl group having a carbon number of at least 1 and no greater than 4 or an alkoxy group having a carbon number of at least 1 and no greater than 4,
• k, p, and q each represent, independently of one another, an integer of at least 0 and no greater than 5,
• m1 and m2 each represent, independently of one another, an integer of at least 1 and no greater than 3,
• when k represents an integer of at least 2, chemical groups R1 may be the same as or different from one another,
• when k represents an integer of at least 2, the chemical groups R1 may be bonded together to form a cycloalkyl ring having a carbon number of at least 3 and no greater than 8,
• when p represents an integer of at least 2, chemical groups R2 may be the same as or different from one another, and
• when q represents an integer of at least 2, chemical groups R3 may be the same as or different from one another, and
• in the general formula (2),
• R4 and R5 each represent, independently of one another, an alkyl group having a carbon number of at least 1 and no greater than 10 and optionally having an aryl group having a carbon number of at least 6 and no greater than 14, a cycloalkyl group having a carbon number of at least 3 and no greater than 10, an alkoxy group having a carbon number of at least 1 and no greater than 6, or an optionally substituted aryl group having a carbon number of at least 6 and no greater than 14, and
• R6 represents an alkyl group having a carbon number of at least 1 and no greater than 10 and optionally having an aryl group having a carbon number of at least 6 and no greater than 14, a cycloalkyl group having a carbon number of at least 3 and no greater than 10, an alkoxy group having a carbon number of at least 1 and no greater than 6, an optionally substituted aryl group having a carbon number of at least 6 and no greater than 14, or an optionally substituted heterocyclic group.