| 摘要 |
A method for preparing hydroxygallium phthalocyanine crystals wherein hydroxygallium phthalocyanine crystals having distinct diffraction peaks at 7.0 DEG , 13.4 DEG , 16.6 DEG , 26.0 DEG and 26.7 DEG of the Bragg angle (2 theta +/-0.2 DEG ) with respect to CuK alpha characteristics X-ray in the X-ray diffraction spectrum are crystal-transferred by solvent treatment. The crystals after crystal-transfer have distinct diffraction peaks at (i) 7.7 DEG , 16.5 DEG , 25.1 DEG and 26.6 DEG , (ii) 7.9 DEG , 16.5 DEG , 24.4 DEG and 27.6 DEG , (iii) 7.0 DEG , 7.5 DEG , 10.5 DEG , 11.7 DEG , 12.7 DEG , 17.3 DEG , 18.1 DEG , 24.5 DEG , 26.2 DEG and 27.1, (iv) 7.5 DEG , 9.9 DEG , 12.5 DEG , 16.3 DEG , 18.6 DEG , 25.1 DEG and 28.8 DEG or (v) 6.8 DEG , 12.8 DEG , 15.8 DEG and 26.0 DEG of the Bragg angle (2 theta +/-0.2 DEG C.) with respect to CuK alpha characteristics X-ray in the X-ray diffraction spectrum. An electrophotographic photoreceptor having a light-sensitive layer on a electroconductive substrate wherein the light-sensitive layer contains at least one of the hydroxygallium phthalocyanine crystals.
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