| abstract |
(57) [Summary] [Object] To provide a hydroxygallium phthalocyanine crystal exhibiting stable properties as a photoconductive material, and an electrophotographic photoreceptor using the same, which has high sensitivity and durability. [Structure] In the X-ray diffraction spectrum, the Bragg angle (2θ ± 0.2 °) of 7.0 with respect to the CuKα characteristic X-ray, Hydroxygallium phthalocyanine is produced by subjecting hydroxygallium phthalocyanine crystals having strong diffraction peaks at 13.4, 16.6, 26.0 and 26.7 ° to a crystal transition by solvent treatment. Specifically, (1) 7.7, 16.5, 25.1 and 26.6 ° of the Bragg angle (2θ ± 0.2 °), (2) 7.9, 16.5, 24.4 and 27.6 °, (3) 7.0, 7.5, 10.5, 11.7, 12.7, 17.3, 18.1, 24.5, 26.2 and 27.1 °, (4) 7.5, 9.9, 12.5, 16.3, 18.6, 25.1 and 28.3 °, (5) 6. Examples thereof include hydroxygallium phthalocyanine crystals having strong diffraction peaks at 8, 12.8, 15.8 and 26.0 °. These are used as charge generating materials for electrophotographic photoreceptors. |