抄録
We have investigated on the photoconductivity of metal-free phthalocyanine ultrafine particles prepared by the gas evaporation method. Two kinds of phthalocyanine ultrafine particles were obtained. Electron micrographs indicate that the crystallites are acicular, typically 500 Å and 4000 Å long each other and the thickness of pigments were much the same as 150 Å thick. Crystal form of ultrafine particles were α type by the measurement of spectral absorption and X-ray diffraction spectra.
The photoreceptor composed of metal-free phthalocyanine ultrafine particles and binder resin shows the high charge acceptance under the positive corona charging. The photoreceptor containing of a large size of metal-free phthalocyanine ultrafine particles shows higher photosensitivity than that of a small size of particles.
