Electrophotographic photoreceptor, process cartridge, and image forming apparatus

1. An electrophotographic photoreceptor comprising:

a conductive substrate; and

a single-layer photosensitive layer that is provided on the conductive substrate and includes a binder resin, at least one kind of charge generation material selected from hydroxygallium phthalocyanine pigments and chlorogallium phthalocyanine pigments, a hole transport material represented by Formula (1), and an electron transport material represented by Formula (2):

wherein in Formula (1), R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 each independently represent a hydrogen atom, a lower alkyl group, an alkoxy group, a phenoxy group, a halogen atom, or a phenyl group which may have a substituent selected from a lower alkyl group, an alkoxy group, and a halogen atom; and m and n each independently represent 0 or 1:

wherein in Formula (2), R 11 , R 12 , R 13 , R 14 , R 15 , R 16 , and R 17 each independently represent a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, or an aryl group; and R 18 represents a linear alkyl group having from 5 to 10 carbon atoms.

2. The electrophotographic photoreceptor according to claim 1 ,

wherein a content of the hole transport material is from 10% by weight to 98% by weight with respect to the binder resin.

3. The electrophotographic photoreceptor according to claim 1 ,

wherein a content of the hole transport material is from 60% by weight to 95% by weight with respect to the binder resin.

4. The electrophotographic photoreceptor according to claim 1 ,

wherein a content of the hole transport material is from 70% by weight to 90% by weight with respect to the binder resin.

5. The electrophotographic photoreceptor according to claim 1 ,

wherein a content of the electron transport material is from 10% by weight to 70% by weight with respect to the binder resin.

6. The electrophotographic photoreceptor according to claim 1 ,

wherein a content of the electron transport material is from 15% by weight to 50% by weight with respect to the binder resin.

7. The electrophotographic photoreceptor according to claim 1 ,

wherein a content of the electron transport material is from 20% by weight to 40% by weight with respect to the binder resin.

8. The electrophotographic photoreceptor according to claim 1 ,

wherein a ratio (hole transport material/electron transport material) of the hole transport material to the electron transport material is from 1 to 9.

9. The electrophotographic photoreceptor according to claim 1 ,

wherein a ratio (hole transport material/electron transport material) of the hole transport material to the electron transport material is from 1.5 to 4.

10. The electrophotographic photoreceptor according to claim 1 ,

wherein the charge generation material is a V-type hydroxygallium phthalocyanine pigment.

11. The electrophotographic photoreceptor according to claim 1 ,

wherein in the hole transport material represented by Formula (1), m and n represent 1.

12. A process cartridge, which is detachable from an image forming apparatus, comprising:

the electrophotographic photoreceptor according to claim 1 .

13. An image forming apparatus comprising:

the electrophotographic photoreceptor according to claim 1 ;

a charging unit that charges the electrophotographic photoreceptor;

an electrostatic latent image forming unit that forms an electrostatic latent image on a charged electrophotographic photoreceptor;

a developing unit that accommodates a developer containing a toner and develops the electrostatic latent image, formed on the electrophotographic photoreceptor, using the developer to form a toner image; and

a transfer unit that transfers the toner image onto a transfer medium.