Titanium phthalocyanine optical semiconductor material and electrophotographic plate using same

An optical semiconductor material comprising:

• (1) a noncrystalline material comprising a titanium phthalocyanine compound selected from the group consisting of a titanium phthalocyanine compound having no substituents on the benzo moieties of the molecule, and a low halogenated titanium phthalocyanine compound having not more than 0.51 halogen substituents in the titanium phthalocyanine molecule, which does not substantially show X-ray diffraction peak in X-ray diffraction chart, or
• (2) a pseudo-noncrystalline material comprising a titanium phthalocyanine compound selected from the group consisting of a titanium phthalocyanine compound having no substituents on the benzo moieties of the molecule, and a low halogenated titanium phthalocyanine compound having not more than 0.51 halogen substituents in the titanium phthalocyanine molecule which shows broad X-ray diffraction peaks at 6.0.degree., 15.5.degree., 23.4.degree. and 25.5.degree. of Bragg angle (20.congruent.0.2.degree.), or
• (3) a mixture of said noncrystalline and said pseudononcrystalline materials.