Bando Chemical Industries, Inc.

Other

Pioneer Electronic Corporation

Tomokazu Kobata

Yosuke Matsui

Hisashi Izumi

Takeo Wakimoto

Kunio Imai

Yasuhiko Shirota

Nobutaka Akashi

Yousuke Matsui

Hiroshi Inada

Toshiaki Kanzaki

The invention provides an organic electroluminescence element which comprises a hole transporting layer which comprises a tris(p-terphenyl-4-yl)amine represented by the general formula (I) wherein R, Rand Rare each independently a hydrogen atom, an alkyl group, a cycloalkyl group which may have substituents or an aryl group which may have substituents as a hole transporting agent, and a hole injecting layer which comprises a hole injecting agent comprising an aromatic tertiary amine having an ionization potential in the range of 5.2-5.6 eV. This organic electroluminescence element can be driven at a low voltage with high efficiency and at high luminance.

Organic electroluminescence element

An organic electroluminescent device having an organic emitting layer and a hole transport layer laminated with each other and arranged between a cathode and an anode, and the hole transport layer is made of tris-phenothiazinyl-triphenylamine or tris-phenoxazinyl-triphenylamine derivative. The hole transport layer has a high heat-resistant property and high conductivity to improve durability and emits light at a high luminance and a high efficiency upon application of a low voltage.

Organic electroluminescent device

There is disclosed a laminated organic photosensitive material which provides a copy image having substantially no interference fringe-like unevenness in darkness thereon. The laminated organic photosensitive material comprises an electroconductive support, an undercoat, a charge producing layer and a charge transporting layer in sequence wherein each of the undercoat and the charge producing layer has a thickness of d (nm) which fulfills the relation

Laminated organic photosensitive material with no interference fringes

A laminated organic photosensitive material which comprises an electroconductive support, a charge producing layer and a charge transporting layer formed thereon wherein the charge producing layer contains X-type nonmetal phthalocyanine as a charge producing substance and the charge transporting layer contains an arylaldehydehydrazone derivative of the general formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each an alkyl or an aryl group.

Laminated organic photosensitive material

There is disclosed a laminated organic photosensitive material which comprises an electroconductive support, an undercoat, a charge producing layer and a charge transporting layer in sequence wherein the undercoat is composed of an alcohol soluble polyamide resin and wherein the charge producing layer contains X-type nonmetal phthalocyanine as a charge producing substance and a mixture of a vinyl chloride-etyhylene copolymer in an amount of 40-95% by weight and a vinyl chloride-vinyl acetate-maleic acid copolymer in an amount of 5-60% by weight based on the mixture as a binder resin for the layer.

Laminated organic photosensitive material comprising an X-type nonmetal

A laminated organic photosensitive material which comprises an electroconductive support, a charge producing layer and a charge transporting layer formed thereon wherein the charge producing layer contains X-type nonmetal phthalocyanine as a charge producing substance and a halogen-containing resin as a binder resin for the layer, and the charge transporting layer contains a hydrazone compound of the formula: ##STR1## as a charge transporting substance and a halogen-containing resin as a binder resin for the charge producing layer.

In an electrophotographic light-sensitive material having a layer of a charge transporting substance and a layer of a charge producing substance on an electrically conductive support, the charge transporting substance is an arylaldehydehydrazone derivative of the general formula: ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are each an alkyl or aryl group.

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Kobe, Japan

Tomokazu Kobata