Patent ID: 8114559

Claim:
An electrophotographic photoreceptor, comprising: a conductive substrate; and a photosensitive layer located overlying the conductive substrate, comprising: a charge generation material; an electron transport material; and a hole transport material having the following formula (2): wherein each of R15 to R21 independently represents a hydrogen atom, a lower alkyl group, an alkoxy group, a phenoxy group, a halogen atom, or an aryl group which may have a substituent group; and each of p1 and p2 independently represents an integer of 0 or 1, and wherein the electron transport material is at least one member selected from the group consisting of the following compounds (1- 1), (1-15), and (1-17): and the hole transport material is at least one member selected from the group consisting of a compound BTA-08 having the formula (2) wherein R15 is H, R16 is H, R17 is 4-CH 3 , R18 is 4-CH 3 , R19 is 4-CH 3 , R20 is 4-CH 3 , R21 is 4-CH 3 , p1 is 0, and p2 is 0; a compound BTA-20 having the formula (2) wherein R15 is H, R16 is H, R17 is 4-OCH 3 , R18 is 4-CH 3 , R19 is 4-CH 3 , R20 is 4-CH 3 , R21 is 4-CH 3 , p1 is 0, and p2 is 0; and a compound BTA-78 having the formula (2) wherein R15 is H, R16 is H, R17 is 4-OCH 3 , R18 is 4-CH 3 , R19 is H, R20 is 4-CH 3 , R21 is H, p1 is 1, and p2 is 1.