Dai Nippon Toryo Co., Ltd.

Nippon Hoso' Kyokai

Kasei Optonix, Ltd.

Japan Electric Industry Development Assoc.

Yoshiyuki Mimura

Akiyasu Kagami

Takashi Hase

Kinichiro Narita

Minoru Hiraki

Ryuya Toyonaga

Junro Koike

Takehiro Kojima

Koichi Takahashi

Kiyoshi Suzuki

Hirokuni Kawashima

Kunihiko Yoneshima

Yoshinori Tanigami

A zinc oxide-based phosphor represented by the following formula emits yellow light of high luminance under excitation of low-velocity electrons:

Phosphor and low-velocity electron excited fluorescent display device

An electrophotographic photoreceptor has a photoconductive layer on a substrate. The photoconductive layer comprises a photoconductor and a water-soluble compound which reacts with free anion released from the photoconductor to produce an unsoluble salt and contains anion having smaller equivalent ionic conductance than that of the free anion.

Electrophotographic photoreceptor

Fluorescent compositions which contain indium oxide and one phosphor selected from the group hereinafter defined in a weight ratio within the range of 1/9 to 9/1l, and fluorescent display devices having said fluorescent compositions in the form of a fluorescent screen, which can emit green, blue or red light under low-velocity electron excitation, said group consisting of a terbium activated lanthanum oxysulfide phosphor or a terbium activated lanthanum yttrium oxysulfide phosphor [(La.sub.1-x, Y.sub.x).sub.2 O.sub.2 S:Tb, wherein O.ltoreq.x &lt;1], a copper and aluminum activated zinc cadmium sulfide phosphor [(Zn.sub.1-x, Cd.sub.x)S: Cu, Al, wherein O.gtoreq.x .ltoreq.0.1], a europium activated strontium gallium sulfide phosphor (SrGa.sub.2 S.sub.4 :Eu.sup.2+), a cerium activated yttrium aluminum gallate phosphor [Y.sub.3 (Al.sub.1-y, Ga.sub.y).sub.5 O.sub.12 :Ce, wherein O.ltoreq.y.ltoreq.O.5], a manganese activated zinc silicate phosphor (Zn.sub.2 SiO.sub.4 :Mn), a terbium activated yttrium oxysulfide phosphor (Y.sub.2 O.sub.2 S:Tb), a silver activated zinc sulfide phosphor (ZnS:Ag), a europium activated yttrium oxysulfide phosphor (Y.sub.2 O.sub.2 S:Eu), a europium activated yttrium oxide phosphor (Y.sub.2 O.sub.3 :Eu), and a europium activated yttrium vanadate phosphor (YVO.sub.4 :Eu).

Low-velocity electron excited fluorescent display device

Fluorescent compositions which contain indium oxide and one phosphor selected from the group hereinafter defined in a weight ratio within the range of 1/9 to 9/1, and fluorescent display devices having said fluorescent compositions in the form of a fluorescent screen, which can emit green, blue or red light under low-velocity electron excitation, said group consisting of a terbium activated lanthanum oxysulfide phosphor or a terbium activated lanthanum yttrium oxysulfide phosphor [(La.sub.1-x,Y.sub.x).sub.2 O.sub.2 S:Tb, wherein 0.ltoreq.x&lt;1], a copper and aluminium activated zinc cadmium sulfide phosphor [(Zn.sub.1-x,Cd.sub.x)S:Cu, Al, wherein 0.ltoreq.x.ltoreq.0.1], a europium activated strontium gallium sulfide phosphor (SrGa.sub.2 S.sub.4 :Eu.sup.2+), a cerium activated yttrium aluminium gallate phosphor [Y.sub.3 (Al.sub.1-y,Ga.sub.y).sub.5 O.sub.12 :Ce, wherein 0.ltoreq.y.ltoreq.0.5], a manganese activated zinc silicate phosphor (Zn.sub.2 SiO.sub.4 :Mn), a terbium activated yttrium oxysulfide phosphor (Y.sub.2 O.sub.2 S:Tb), a silver activated zinc sulfide phosphor (ZnS:Ag), a europium activated yttrium oxysulfide phosphor (Y.sub.2 O.sub.2 S:Eu), a europium activated yttrium oxide phosphor (Y.sub.2 O.sub.3 :Eu), and a europium activated yttrium vanadate phosphor (YVO.sub.4 :Eu).

A process for preparing a divalent europium activated alkaline earth metal aluminate phosphor represented by the composition formula

Process for preparing a divalent europium activated alkaline earth metal

Fluorescent compositions which contain zinc oxide and one phosphor selected from the group hereinafter defined in a weight ratio within the range of 1/9 to 9/1, and fluorescent display devices having said fluorescent compositions in the form of a fluorescent screen, which can emit green, blue or red light under low-velocity electron excitation, said group consisting of a copper and aluminium activated zinc cadmium sulfide phosphor [(Zn.sub.1-x, Cd.sub.x)S:Cu, Al, wherein 0.ltoreq.x.ltoreq.0.1], a cerium activated yttrium aluminium gallium oxide phosphor [Y.sub.3 (Al.sub.1-y, Ga.sub.y).sub.5 O.sub.12 :Ce, wherein 0.ltoreq.y.ltoreq.0.5], a manganese activated zinc silicate phosphor (Zn.sub.2 SiO.sub.4 :Mn), a terbium activated yttrium lanthanum oxysulfide phosphor [(Y.sub.1-z, La.sub.z).sub.2 O.sub.2 S: Tb, wherein 0.ltoreq.z.ltoreq.1], a europium activated strontium gallium sulfide phosphor (SrGa.sub.2 S.sub.4 :Eu.sup.2+), a silver activated zinc sulfide phosphor (ZnS:Ag), and a europium activated yttrium oxysulfide phosphor (Y.sub.2 O.sub.2 S:Eu).

Fluorescent compositions which contain zinc oxide and one phosphor selected from the group hereinafter defined in a weight ratio within the range of 1/9 to 9/1, and fluorescent display devices having said fluorescent compositions in the form of a fluorescent screen, which can emit green, blue or red light under low-velocity electron excitation, said group consisting of a copper and aluminium activated zinc cadmium sulfide phosphor [(Zn.sub.1-x, Cd.sub.x)S:Cu, Al, wherein 0.ltoreq.x.ltoreq.0.1], a cerium activated yttrium aluminium gallium oxide phosphor [Y.sub.3 (Al.sub.1-y, Ga.sub.y).sub.5 O.sub.12 :Ce, wherein 0.ltoreq.y.ltoreq.0.5], a manganese activated zinc silicate phosphor (Zn.sub.2 SiO.sub.4 :Mn), a terbium activated yttrium lanthanum oxysulfide phosphor [(Y.sub.1-z, La.sub.z).sub.2 O.sub.2 S:Tb, wherein 0.ltoreq.z.ltoreq.1], a europium activated strontium gallium sulfide phosphor (SrGa.sub.2 S.sub.4 :Eu.sup.2+), a silver activated zinc sulfide phosphor (ZnS:Ag), and a europium activated yttrium oxysulfide phosphor (Y.sub.2 O.sub.2 S:Eu).

Fluorescent compositions

Fluorescent compositions for low-velocity electron excited fluorescent

A fluorescent display device capable of emitting blue to green light of high luminance and purity is composed of a vacuum tube having an anodic plate bearing thereon a fluorescent screen and a cathode facing the fluorescent screen. The fluorescent screen comprises a gallate-based phosphor represented by the formula

In an air-tight at least partially transparent container, a phosphor, a gas or gas mixture and a pair of discharging electrodes are contained. The discharge gap is in the range of 0.1 to 3.0mm, and the pressure of the gas or gas mixture sealed in the container is such that the product of the pressure and the discharge gap is in the range of 30 to 300 Torr.mm. The gas or gas mixture has discharge radiation spectra within the region of wavelength shorter than 200nm. The phosphor is a manganese activated aluminate phosphor represented by the formula

Gaseous discharge light emitting element

Fluorescent compositions which contain indium oxide and one phosphor selected from the group hereinafter defined in a weight ratio within the range of 1/9 to 9/1, and fluorescent display devices having said fluorescent compositions in the form of a fluorescent screen, which can emit green, blue or red light under low-velocity electron excitation, said group consisting of a terbium activated lanthanum oxysulfide phosphor or a terbium activated lanthanum yttrium oxysulfide phosphor [(La.sub.1-x, Y.sub.x).sub.2 O.sub.2 S:Tb, wherein 0.ltoreq.x&lt;1], a copper and aluminium activated zinc cadmium sulfide phosphor [(Zn.sub.1-x, Cd.sub.x)S: Cu, Al, wherein 0.ltoreq.x.ltoreq.0.1], a europium activated strontium gallium sulfide phosphor (SrGa.sub.2 S.sub.4 :Eu.sup.2+), a cerium activated yttrium aluminium gallate phosphor [Y.sub.3 (Al.sub.1-y, Ga.sub.y).sub.5 O.sub.12 :Ce, wherein 0.ltoreq.y.ltoreq.0.5], a manganese activated zinc silicate phosphor (Zn.sub.2 SiO.sub.4 :Mn), a terbium activated yttrium oxysulfide phosphor (Y.sub.2 O.sub.2 S:Tb), a silver activated zinc sulfide phosphor (ZnS:Ag), a europium activated yttrium oxysulfide phosphor (Y.sub.2 O.sub.2 S:Eu), a europium activated yttrium oxide phosphor (Y.sub.2 O.sub.3 :Eu), and a europium activated yttrium vanadate phosphor (YVO.sub.4 :Eu).

Growing community of inventors

Kamakura, Japan

Yoshiyuki Mimura