Abstract: A lanthanum phosphate phosphor for vacuum ultraviolet radiation, which is represented by a composition formula of (La1-x-yCexTby) PO4, wherein x and y are numbers which satisfy 0≦x≦0.2 and 0.05≦y≦0.3, respectively, and which emits light when irradiated with vacuum ultraviolet radiation having a wavelength of at most 200 nm.

Abstract: An aluminate phosphor activated with Eu or coactivated with Eu and Mn, which contains sulfur; a process for its production; a phosphor paste composition; and a vacuum ultraviolet ray excitation type light-emitting device having a fluorescent layer made of such a phosphor.

Abstract: A phosphor consisting of hollow particles, each hollow particle having an outer shell and a space in the inside of said outer shell.

Abstract: A radiographic intensifying screen having at least a fluorescent layer and a protective layer on a support, wherein the protective layer has a multi-layer structure comprising at least one layer of an organic macromolecule film and a film-forming resin layer provided on the surface of the organic macromolecule film at least on the side which is not in contact with the fluorescent layer, and the resin of the film-forming resin layer is different from the resin of the organic macromolecule film.

Abstract: When each of a rare earth oxysulfide phosphor represented by the composition formula (I) of Ln.sub.2 O.sub.2 S:xRe, yM wherein Ln represents at least one rare earth element selected from Y, La and Gd; Re represents at least one rare earth element selected from Pr and Tb; M represents at least one element selected from Nb, Ta and Mn; and x and y are numbers which satisfy the conditions of 1.times.10.sup.-4 .ltoreq.x.ltoreq.0.2 and 0.01 ppm .ltoreq.y.ltoreq.1000 ppm, respectively, and a rare earth oxysulfide phosphor represented by the composition formula (II) of (Gd .sub.1-x-y-z, Pr.sub.x, Sc.sub.y, Ce.sub.z).sub.2 O.sub.2 S wherein x, y and z are numbers which satisfy the conditions of 10.sup.-4 .ltoreq.x.ltoreq.2.times.10.sup.-1, 10.sup.-4 .ltoreq.y.ltoreq.10.sup.-1 and 0.ltoreq.z.ltoreq.10.sup.-6, respectively is excited by radiation, each of them emits a scintillation at high efficiency, and decreases the afterglow.

Abstract: A reed valve is disclosed for use with a pump having a casing. A check valve unit is provided within the casing for preventing counterflow of fluids to be carried. A suction port communicates with a suction line into which the fluids to be carried flow, and a discharge port communicates with discharge line from which the fluids to be carried out are discharged. Reed valves are mounted on the suction port and on the discharge port of the check valve, respectively, in such a manner that the reed valves cover the suction port and the discharge port so as to be able to open and close. Each reed valve includes a first reed valve and second reed valve. The first reed valve is made of pliable material, and is formed to have a size capable of covering the entire respective suction port and discharge port. The second reed valve is smaller than first reed valve and is superposed on the first reed valve to engage the first reed valve such that the first reed valve can open and close, while enhancing sealability thereof.

Abstract: A piezoelectric element characterized by comprising a piezoelectric crystal which has a crystal structure around the crystal phase boundary of tetragonal and rhombohedral (MPB) in a specific temperature range and at least most of which phase-transits to tetragonal when heated to a temperature range higher than the above specific temperature range, and a method for driving the piezoelectric element in a temperature range not lower than the above specific temperature range.

Abstract: A phosphor having a surface coated with a metal alkoxide containing a quaternary ammonium salt.

Abstract: A manganese-activated aluminate phosphor represented by the following compositional formula and a vacuum ultraviolet ray excitation type light-emitting element having this phosphor as a fluorescent layer:(1-a)(bMO.multidot.6Al.sub.2 O.sub.3).multidot.a(MMg.sub.1-c Mn.sub.c Al.sub.10 O.sub.17)wherein M is at least one member of Ba and Sr, and a, b and c are numbers satisfying the conditions of 0.05.ltoreq.a.ltoreq.1.0, 0.64.ltoreq.b.ltoreq.0.86, 0.05.ltoreq.c.ltoreq.1.0 and 0.05.ltoreq.a.times.c.ltoreq.0.

Abstract: A phosphorescent phosphor represented by m(Sr.sub.1-a,M.sup.1.sub.a)O.n(Mg.sub.1-b, M.sup.2.sub.b)O.2(Si.sub.1-c,Ge.sub.c)O.sub.2 :Eu.sub.x Ln.sub.y, wherein M.sup.1 is Ca and/or Ba, M.sup.2 Be, Zn and/or Cd, Ln is Sc, Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, B, Al, Ga, In, Tl, Sb, Bi, As, P, Sn, Pb, Ti, Zr, Hf, V, Nb, Ta, Mo, W, Cr and/or Mn, and wherein a, b, c, m, n, x and y are within ranges of 0.ltoreq.a.ltoreq.0.8, 0.ltoreq.b.ltoreq.0.2, 0.ltoreq.c.ltoreq.0.2, 1.5.ltoreq.m.ltoreq.3.5, 0.5.ltoreq.n.ltoreq.1.5. 1.times.10.sup.-5 .ltoreq.x.ltoreq.1.times.10.sup.-1, and 1.times.10.sup.-5 .ltoreq.y.ltoreq.1.times.10.sup.-1, and which contains a halogen element such as F, Cl, Br or I in an amount within range of from 1.times.10.sup.-5 to 1.times.10.sup.-1 g.multidot.atm/mol of the host material.

Abstract: A long persistent phosphorescence phosphor contains a europium-activated long persistent phosphorescence silicate phosphor of the formula (I),m(Sr.sub.1-a M.sup.1.sub.a)O.multidot.n(Mg.sub.1-b M.sup.2.sub.b)O.multidot.2(Si.sub.1-c Ge.sub.c)O.sub.2 :Eu.sub.x Ln.sub.y (I)containing at least one halogen atom in a specific amount, and an organic fluorescent pigment which is deposited on the surface of the europium-activated long persistent silicate phosphor.

Abstract: A fluorescent lamp includes either laminated layers including a non-fluorescent substance layer, and a phosphor layer, or a layer including a mixture of the non-fluorescent substance, and a phosphor, wherein the non-fluorescent substance is a rare earth oxide of either yttrium, gadolinium, or lanthanum. The rare earth oxide is fired to at least 1000.degree. C. thereby providing the lamp with a higher luminous flux maintaining ratio.

Abstract: An aluminate phosphor comprising (a) at least one element selected from the group consisting of Ba, Sr and Ca, (b) Eu, (c) Mg and/or Zn, (d) optionally Mn and (e) Al, said aluminate phosphor comprising a crystalline inorganic compound which shows, in its powder X-ray diffraction pattern upon incidence of X-rays of CuK.alpha..sub.1, no peak at Miller index 008 independent of a diffraction peak at Miller index 110.

Abstract: A green-emitting phosphor of Tb-activated oxide, which is represented by the compositional formula:(Y.sub.l-x-y-z Tb.sub.x Yb.sub.yD.sub.z).sub.3 (Al.sub.l-w Ga.sub.w).sub.5 O.sub.12wherein D is at least one element selected from the group consisting of Sc and La, and x, y, z and w are numbers satisfying the following conditions:1.times.10.sup.-2 .ltoreq.x.ltoreq.2.times.10.sup.-11.times.10.sup.-6 .ltoreq.y.ltoreq.2.times.10.sup.-21.times.10.sup.-4 .ltoreq.z.ltoreq.5.times.10.sup.-10.ltoreq.w.ltoreq.1,and which contains from 1.times.10.sup.-5 to 1.times.10.sup.-2 gram atom of barium element per mol of the phosphor and is capable of emitting a color within the following range by CIE chromaticity coordinates:0.325.ltoreq.X.ltoreq.0.3600.540.ltoreq.Y.ltoreq.0.625.

Abstract: This invention relates to a radiographic intensifying screen excellent in sharpness and durability, which comprises a support, a fluorescent layer formed on the support, and a protective layer formed by coating a solution containing a protective layer-forming resin on the fluorescent layer, wherein a water repellent layer or a resin layer which may optionally contain a water repellent is provided between the fluorescent layer and the protective layer, or the fluorescent layer may optionally contain a water repellent, and also relates to a process for preparing the same.

Abstract: A fluorescent lamp having a non-fluorescent substance layer and a phosphor layer laminated and coated on, or having a fluorescent composition composed of a mixture of a non-fluorescent substance and a phosphor, coated on the inner wall of a glass bulb, wherein the non-fluorescent substance is an oxide containing at least one rare earth element selected from the group consisting of yttrium, gadolinium and lanthanum.

Abstract: A method for reclaiming a pigment-attached red-emitting phosphor recovered from a manufacturing process for a color picture tube, which comprises treating the phosphor with an aqueous solution containing NaOH, NaClO and H.sub.2 O.sub.2 and then treating it with a weak acid, whereby the pigment can be prevented from exfoliation by suppressing the dissolution of the binder which attaches the pigment to the phosphor, and blue- and green-emitting phosphors contained as contaminants in the recovered red-emitting phosphor can be completely removed. The method provides a reclaimed red-emitted phosphor with high luminance and a good coating property.

Abstract: A rare earth oxysulfide phosphor of the formula (Ln.sub.1-x-y La.sub.x Ln'.sub.y).sub.2 O.sub.2 S wherein Ln is at least one element selected from the group consisting of Y, Gd, Sc and Lu, Ln' is at least one element selected from the group consisting of Eu, Tb, Sm, Er, Tm, Dy, Ho, Nd and Pr, and x and y are numbers within ranges of 0.005<x.ltoreq.0.07 and 0.0001.ltoreq.y.ltoreq.0.2, respectively.

Abstract: A color cathode-ray tube having a fluorescent screen of red-, blue- and green-emitting phosphors as image elements of a fluorescent layer, wherein at least one of said phosphors is coated with a double oxide of zinc and aluminum.

Abstract: The present invention provides a pigment-attached blue-emitting phosphor having attached a blue pigment which has fastness and chemical stability and is excellent in reflection spectrum characteristics, and a color cathode-ray tube having a blue-emitting fluorescent layer containing the blue pigment formed on the inner surface of a face plate.The present invention also provides a pigment-attached blue-emitting phosphor having a CoO.ZnO.SiO.sub.2 type blue pigment attached thereto, and a color cathode-ray tube provided with a blue-emitting fluorescent layer containing the blue pigment particles on the inner surface of a face plate.