15 October 1996 Electrophotographic performance of phthalocyanine pigment composites containing titanyl phthalocyanine
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Spectral sensitivity is an important consideration in photoconductor formulation, depending on the particular type of electrophotographic device in which the photoconductor is to be used. High sensitivity in both the near-IR and visible spectral regions would be desirable for a photoconductor used with a wide variety of exposure sources. One possible way to achieve this goal is to use a mixture of charge generation pigments with absorptions in the desired spectral regions. The absorption spectra (and the spectral sensitivity) of phthalocyanine pigments vary according to the metal coordinating the phthalocyanine, and with coordination of different axial ligands (02-, Cl-, OH-, et al.). In this paper, pthalocyanine pigment composites with different sensitometric properties are prepared by coprecipitation of titanyl phthalocyanine with another phthalocyanine pigment from an organic solvent/trifluoroacetic acid solution. The phthalocyanine pigments used in the composites were chosen on the basis of their structures relative to titanyl phthalocyanine (i.e., presence or absence of an axial ligand). The crystal structure of the composites largely follows the structure of the majority component of the composite, and the photosensitivity of the O equals Ti(pc)/ClIn(pc) composites is high even at low O equals Ti(pc) concentration.
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Garry D. Hinch, Garry D. Hinch, Karin A. Voll, Karin A. Voll, "Electrophotographic performance of phthalocyanine pigment composites containing titanyl phthalocyanine", Proc. SPIE 2850, Organic Photorefractive Materials and Xerographic Photoreceptors, (15 October 1996); doi: 10.1117/12.254244; https://doi.org/10.1117/12.254244

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