Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus, and gallium phthalocyanine crystal

An electrophotographic photosensitive member comprising:

• a support;
• and
• a photosensitive layer formed on the support;
• wherein the photosensitive layer comprises:
• a gallium phthalocyanine crystal in which a compound represented by the following formula (2) is contained:
• wherein,
• four pieces of R11 may be identical or different from each other, and represent a hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group, and
• four pieces of Ar11 may be identical or different from each other, and represent a substituted or unsubstituted aromatic hydrocarbon ring group, a substituted or unsubstituted hetero ring group, or a mono-valent group formed by a combination of a plurality of groups selected from the group consisting of a substituted aromatic hydrocarbon ring group, an unsubstituted aromatic hydrocarbon ring group, a substituted hetero ring group, and an unsubstituted hetero ring group.

A gallium phthalocyanine crystal in which a compound represented by one of the following formula (1) and the following formula (2) is contained:

• wherein,
• n represents an integer selected from 4 to 8,
• n pieces of R1 may be identical or different from each other, and represent a hydrogen atom or a substituted or unsubstituted alkyl group,
• n pieces of R2 may be identical or different from each other, and represent a hydrogen atom or an alkyl group,
• n pieces of R3 may be identical or different from each other, and represent a hydrogen atom or an alkyl group, and
• n pieces of Ar1 may be identical or different from each other, and represent a substituted or unsubstituted aromatic hydrocarbon ring group, a substituted or unsubstituted hetero ring group, or a mono-valent group formed by a combination of a plurality of groups selected from the group consisting of a substituted aromatic hydrocarbon ring group, an unsubstituted aromatic hydrocarbon ring group, a substituted hetero ring group, and an unsubstituted hetero ring group;
• and
• wherein,
• four pieces of R11 may be identical or different from each other, and represent a hydrogen atom, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted aryl group, and
• four pieces of Ar11 may be identical or different from each other, and represent a substituted or unsubstituted aromatic hydrocarbon ring group, a substituted or unsubstituted hetero ring group, or a mono-valent group formed by a combination of a plurality of groups selected from the group consisting of a substituted aromatic hydrocarbon ring group, an unsubstituted aromatic hydrocarbon ring group, a substituted hetero ring group, and an unsubstituted hetero ring group.