Nec Corporation

Toyo Ink Manufacturing Company

Hitachi, Ltd.

Shigemasa Takano

Naoyuki Matsui

Hirosada Morishita

Tomoyuki Yoshii

Atsushi Kakuta

Yasuki Mori

Kotaro Araya

Toshio Enokida

Shigeo Suzuki

Tomohisa Gotoh

Hiroyuki Oka

Manabu Sawada

Yoshikazu Mimura

Kikukazu Sakurai

Isao Kumano

Mitsuo Usuba

Tomoko Noguchi

An organic semiconductor including an organic semiconductor layer, which layer is formed by epitaxially depositing molecules of a compound selected from phthalocyanines to form a super-thin film configuration including one-dimensional columns of stacked molecules in the form of quantum wires separated respectively from each other.

Organic quantum semiconductor and quantum semiconductor device

An electropotographic photoreceptor has a charge-transfer layer including at least two of charge-transfer materials, difference in oxidation potential between the charge-transfer materials being 0.1V or less and the charge-transfer materials having chemical structure similar to each other.

electrophotographic photoreceptors

A new composition of titanyl phthalocyanine is provided. This composition has in its infrared absorption spectrum characteristically strong absorptions at absorption wavenumbers (in unit of cm.sup.-1) of 1490.+-.2, 1415.+-.2, 1332.+-.2, 1119.+-.2, 1072.+-.2, 1060.+-.2, 961.+-.2, 893.+-.2, 780.+-.2, 751.+-.2 and 730.+-.2, and has an extremely high solvent stability and dispersibility, and a large photoelectric conversion efficiency. The new form of composition can be obtained by adding to titanyl phthalocyanine, compounds of other phthalocyanines or naphthalocyanines as additives, and treating the amorphous composition of the mixture to crystallize the composition. By applying an appropriate binder, with the novel composition crystals as a charge generation agent, on a substrate, it is possible to obtain an electrophotographic photosensitive material that has a charge generation layer with an extremely high dispersibility and an extremely large photoelectric conversion efficiency.

Titanyl phthaloycyanine crystal, method of manufacture thereof and its

As a charge transport material for a charge transport layer of an electrophotographic photosensitive material, a poly-2,3-epoxypropyl carbazole compound is used together with a specific hydrazone compound and/or a specific butadiene compound. Film-formation property and adhesive property of the charge transport layer are much improved thereby to enable use of a photoconductive material in a higher concentration.

Electrophotographic photosensitive material

This invention provides an optical semiconductor material comprising: (1) a noncrystalline titanium phthalocyanine compound which does not show substantial X-ray diffraction peak in X-ray diffraction chart, (2) a pseudo-noncrystalline titanium phthalocyanine compound which shows broad X-ray diffraction peaks at Bragg angles of 6.9.degree., 15.5.degree., 23.4.degree. and 25.5.degree. measured by using CuK.alpha. beam and (3) an assembly of said noncrystalline titanium phthalocyanine compound and pseudo-noncrystalline titanium phthalocyanine compound. Further, this invention provides an electrophotographic plate comprising an electrically conductive substrate, and a charge-generating layer and charge-transferring layer on the electrically conductive substrate, characterized in that the charge-generating layer contains the above noncrystalline and/or pseudo-noncrystalline titanium phthalocyanine compound(s).

Titanium phthalocyanine optical semiconductor material and

The disclosure is concerned with an electrophotographic recording medium having a layer of a photoconductive material containing at least one member selected from the group consisting of .tau., .tau.', .eta., and/or .eta.' form metal free phthalocyanine, the layer being formed on an electroconductive supporter. The recording medium of this invention is characterized in that the recording medium exhibits high sensitivity to longer wavelength light.

Electrophotographic recording medium containing .tau. and .eta.

Growing community of inventors

Tokyo, Japan

Shigemasa Takano