Electrophotographic photoreceptor, process cartridge and image-forming apparatus including electrophotographic photoreceptor

An electrophotographic photoreceptor comprising at least a photoreceptive layer on a conductive base,

• wherein the photoreceptive layer contains a silica filler and an electron transporting substance represented by general formula (I):
• wherein Ra and Rb are identically or independently a hydrogen atom, a halogen atom, a cyano group, a nitro group, a hydroxyl group, an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an aryl group that may have a substituent, a heterocyclic group that may have a substituent, an ester group, a cycloalkyl group, an aralkyl group that may have a substituent, an allyl group, an amide group, an amino group, an acyl group, an alkenyl group, an alkynyl group, a carboxyl group, a carbonyl group, a carboxylic group, or an alkyl halide group;
• and the substituents each are a halogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, a hydroxyl group, a cyano group, an amino group, a nitro group, or an alkyl halide group;
• and
• wherein when a content of the silica filler to a total solid content of the photoreceptive layer is denoted by w (% by mass), when an average primary particle diameter of the silica filler is denoted by d (nm), and when a content of the electron transporting substance to the total solid content of the photoreceptive layer is denoted by x (% by mass), the electrophotographic photoreceptor satisfies the following relationship:
• 0.12
• <
• w
• /
• (
• d
• ×
• x
• )
• <
• 0.54
• .