Abstract: A phosphor for emission of light under low-velocity electron excitation having the formula:(Zn.sub.1-X,Cd.sub.x)S:aLi,bM.sup.I,cX (I)wherein 0.ltoreq.x.ltoreq.1, 0<a<1.times.10.sup.-2 g/g, b.gtoreq.0, c>0, M.sup.I is at least one element selected from the group consisting of Na, K, Ag, Rb, Cs, Au and Cu, and X is at least one element selected from the group consisting of Al, Cl, Br and I.

Abstract: A phosphor for emission of light under low-velocity electron excitation having the formula:(Zn.sub.1-X,Cd.sub.x)S:aLi,bM.sup.I,cX (I)wherein 0.ltoreq.x.ltoreq.1, 0<a<1.times.10.sup.-2 g/g, b.gtoreq.0, c>0, M.sup.I is at least one element selected from the group consisting of Na, K, Ag, Rb, Cs, Au and Cu, and X is at least one element selected from the group consisting of Al, Cl, Br and I.

Abstract: A zinc oxide-based phosphor represented by the following formula emits yellow light of high luminance under excitation of low-velocity electrons:xM.sup.II F.sub.2.yM.sup.III F.sub.3.ZnOwherein M.sup.II is at least one divalent metal selected from the group consisting of beryllium, magnesium, calcium, strontium, barium, zinc and tin, M.sup.III is at least one trivalent metal selected from the group consisting of aluminum, gallium, indium, thallium, yttrium and antimony, and x and y are numbers satisfying the conditions of 0.0001.ltoreq.x+y.ltoreq.0.1, 0.ltoreq.x and 0<y. The zinc oxide-based phosphor is used as a fluorescent screen of a low-velocity electron excited fluorescent display device.

Abstract: Blue, green, red and yellow emitting fluorescent compositions which emit blue, green, red and yellow light of high luminance under low-velocity electron excitation occurring under acceleration potential below 1KV, particularly below 100V can be obtained by mixing a conductive material having a particle diameter distribution wherein central value is within the range of 2.5 to 14.mu. and standard deviation is not more than 0.7, and specific blue, green, red and yellow emitting phosphors in a mixing weight ratio ranging from 1:99 to 1:4, respectively. The conductive material is selected from the group consisting of a conductive metal oxide, mixtures of more than one kind of conductive metal oxide, a conductive metal sulfide, mixtures of more than one kind of conductive metal sulfide and mixtures thereof. These blue, green, red and yellow emitting fluorescent compositions are used as a fluorescent screen of a low-velocity electron excited fluorescent display device.

Abstract: 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 <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.

Abstract: 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<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.

Abstract: A process for preparing a divalent europium activated alkaline earth metal aluminate phosphor represented by the composition formulaaMgO.multidot.bBaO.multidot.cAl.sub.2 O.sub.3 .multidot.dEuOwherein a, b, c and d satisfy the conditionsa+b+c+d=10, and0<a.ltoreq.2.00, 0.25.ltoreq.b.ltoreq.2.00, 6.0.ltoreq.c.ltoreq.8.5, 0.05.ltoreq.d.ltoreq.0.30. A magnesium compound easily alterable to MgO at a high temperature, barium halide or mixture of barium compounds easily alterable to BaO at a high temperature containing barium halide at such a rate that the amount of barium contained in the barium halide is not less than 70% by weight of the total amount of barium in the mixture of the barium compounds, an aluminium compound easily alterable to Al.sub.2 O.sub.3 at a high temperature and a europium compound easily alterable to Eu.sub.2 O.sub.3 at a high temperature are mixed at a mixing weight ratio to satisfy the above composition formula. The mixture thus obtained is fired in air at a temperature of 1200.degree.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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 formulaA(Zn.sub.1-x,Mg.sub.x)O.multidot.Ga.sub.2 O.sub.3 :BMnwherein 0.6 .ltoreq. A .ltoreq. 1.2, 0 .ltoreq. B .ltoreq. 5 .times. 10.sup.-2, and 0 .ltoreq. x .ltoreq. 1.0. The vacuum tube may further contain a control grid between the anodic plate and the cathode.

Abstract: In an air-tight container made of transparent material, 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 europium activated yttrium gadolinium borate phosphor represented by the formula{ [ ( Y.sub.1-x, Gd.sub.x ).sub.1-z B.sub.z ].sub.1-y Eu.sub.y }.sub.2 O.sub.3where x, y and z are defined by the ranges of 0.ltoreq.x.ltoreq.1, 0.001.ltoreq.y.ltoreq.0.1 and 0.25.ltoreq.z.ltoreq.0.75. More preferably, x, y and z are defined by the ranges of 0.10.ltoreq.x.ltoreq.0.60, 0.005.ltoreq.y.ltoreq.0.05 and 0.50.ltoreq.z.ltoreq.0.65.

Abstract: 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(M.sup.II.sub.1-x, Mn.sub.x ) O.multidot.zAl.sub.2 O.sub.3where M.sup.II is selected from a group consisting of calcium, strontium, barium, magnesium and zinc, and x and z are numbers within the ranges of 10.sup.-3 .ltoreq.x.ltoreq.7.times.10.sup.-1 and 1.ltoreq.z.ltoreq.20, respectively.

Abstract: 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<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.

Abstract: A luminous device includes a cell, electrodes having a discharge gap of from 0.1 to 3.0 mm, a phosphor and a gas at a pressure of 30 to 300 nm, the gas having discharge emission spectra below 200 nm. The phosphor is one of various cerium activated yttrium silicates or europium activated orthophosphates and is disposed in the cell for exposure to the emission discharge of the gas. The device gives off blue light with higher emission efficiency and chroma saturation.