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 radiation image storage panel for obtaining a radiation image of an object by causing said panel to absorb a radiation transmitted through said object and then exposing the panel to light of wavelength ranging from 450 to 800 nm to cause the panel to release radiation energy stored therein as fluorescent light, said panel having a fluorescent layer of a rare earth element activated complex halide stimulable phosphor represented by the formulaBaF.sub.2.aBaX.sub.2.bMe.sup.I F.cMe.sup.II F.sub.2.dMe.sup.III F.sub.3 :eLnwherein X is at least one halogen selected from the group consisting of chlorine, bromine and iodine, Me.sup.I is at least one alkali metal selected from the group consisting of lithium and sodium, Me.sup.II is at least one divalent metal selected from the group consisting of beryllium, calcium and strontium, Me.sup.

Abstract: In a projection type color picture display system having red, green and blue picture producing cathode-ray tubes in which the green picture producing cathode-ray tube is capable of emitting green light defined as x.ltorsim.0.330 and y.gtorsim.0.570 in the CIE chromaticity diagram, use is made of a ZnS: Ag, Al phosphor material for forming the phosphor screen of the blue picture producing cathode-ray tube. The projection type display system thus obtained is capable of displaying color pictures with a high color purity and a high saturation.

Abstract: A radiographic intensifying screen comprising a support and a fluorescent layer formed thereon, said fluorescent layer consisting essentially of at least one terbium-activated rare earth oxysulfide phosphor of the formula:(Ln.sub.1-x-y, Tb.sub.x, A.sub.y).sub.2 O.sub.2 S (I)wherein Ln is at least one element selected from the group consisting of Y, La, Gd and Lu, A is at least one element selected from the group consisting of Ce, Pr, Nd, Dy, Er and Tm, and x and y are numbers within the ranges of 0.002.ltoreq.x.ltoreq.0.20 and 0.ltoreq.y.ltoreq.0.01, respectively, and at least one terbium-activated rare earth tantalate complex oxide phosphor of the formula:(Ln'.sub.1-z, Tb.sub.z).sub.2 O.sub.3.mTa.sub.2 O.sub.5.nB.sub.2 O.sub.3 (II)wherein Ln' is at least one element selected from the group consisting of Y, La, Gd and Lu, and z, m and n are numbers within the ranges of 0.0001.ltoreq.z.ltoreq.0.1, 0.95.ltoreq.m.ltoreq.1.05 and 0.ltoreq.n.ltoreq.5.0, respectively.

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 gradient radiation image conversion sheet, comprising a protective layer a fluorescent layer and a support layer, and the transmissions of said protective layer and/or said fluorescent layer are partially changed and the dots of the print of said gradient patterns and the border between the printed area and the unprinted area are blurred. The gradient image conversion sheet has a gradation area in which the change in transmission is extremely smooth and a speed ratio which may be set in a relatively wide range, and the sheet can be produced through a mass-production system to give products of constant quality.

Abstract: The present invention relates to an electron-beam excited display tube useful in such a display apparatus as a color cathode-ray tube. In accordance with the present invention, the content of europium as a activator for a rare earth oxysulfide fluorescent material used as the red emission component is within the range of 0.05 to 2.0 mol %, thereby providing a very bright and low cost electron-beam excited display tube without any uneven color reproduction, even when the display screen is seen from very close quarters.

Abstract: A borate phosphor represented by the formula a(M.sup.II.sub.1-x, M.sup.IV.sub.x/2)O.bM.sup.V.sub.2 O.sub.5.cM.sup.I.sub.2 O.(B.sub.1-y-z,M.sup.III.sub.y, M.sup.VI.sub.z/2).sub.2 O.sub.3 :dCe,eTb wherein M.sup.II is at least one divalent metal selected from the group consisting of Mg, Be, Zn, Cd, Ca, Sr and Ba; M.sup.IV is at least one tetravalent element selected from the group consisting of Si, Ti, Ge, Zr, Sn, Th and Pb; M.sup.V is at least one pentavalent element selected from the group consisting of P, V, Nb, Sb, Ta and As; M.sup.I is at least one alkali metal selected from the group consisting of Li, Na, K, Rb and Cs; M.sup.III is at least one trivalent metal selected from the group consisting of Al, Sc, Ga, Y, In, La, Lu, Gd, Bi and Tl; M.sup.VI is at least one hexavalent meteal selected from the group consisting of Mo, Te and W; and a, b, c, d, e, x, y and z are numbers satisfying the conditions of 0<a.ltoreq.2.0; 0.ltoreq.b.ltoreq.0.3; 0.ltoreq.c.ltoreq.0.3, 0<d.ltoreq.0.6, 0.ltoreq.e.ltoreq.0.

Abstract: A silicate phosphor comprising manganese as an activator, a trivalent element and a pentavalent element, wherein said trivalent element is at least one element selected from the group consisting of boron and indium, said pentavalent element is at least one element selected from the group consisting of arsenic, antimony and bismuth, the content of the trivalent element is from 1.times.10.sup.-4 to 2.times.10.sup.-2 gram-atom/mol, the content of the pentavalent element is not more than 3.times.10.sup.-3 gram-atom/mol, and the molar ratio of the trivalent element to the pentavalent element (trivalent element/pentavalent element) is at least 1.5.

Abstract: A gradient intensifying screen comprising a support, a fluorescent layer formed on the support and a transparent protective layer formed on the fluorescent layer, characterized in that at least a part of the transparent protective layer is dyed with a dyestuff so that the light transmission of the transparent protective layer is partially varied.

Abstract: A cathode ray tube having a fluorescent screen of a copper and aluminum activated zinc sulfide phosphor (ZnS:Cu,Al). The ZnS:Cu,Al phosphor has a Cu activator value ranging from 3.times.10.sup.-4 to 5.times.10.sup.-3 grams per 1 gram of ZnS; an emission color point within a yellowish green region in the color coordinates of CIE color system represented by values x and y ranging from 0.295 to 0.370 and 0.570 to 0.630, respectively; a color point of body color within a yellow region in the color coordinates of CIE color system represented by values x and y ranging from 0.380 to 0.400 and 0.390 to 0.440, respectively; and a mean reflectance in the visible spectrum region of not less than 75% when the mean reflectance of a magnesium oxide diffusion plate is defined to be 100%.

Abstract: A fluorescent screen having a sensitivity variation in which a plurality of gradations (continuous density variation) whose end edges are shifted by a predetermined distance is formed on a support of phosphor and a phosphor layer is provided thereon, and a method of manufacturing such screen.

Abstract: An intensifying screen comprising: a support, a fluorescent layer on the support and a protective layer on the fluorescent layer, wherein the fluorescent layer is composed essentially of a blue emitting phosphor selected from the group consisting of (1) a M.sup.II WO.sub.4 phosphor wherein M.sup.II is at least one of Mg, Ca, Zn and Cd, (2) a CaWO.sub.4 phosphor, (3) a BaSO.sub.4 :Pb phosphor, (4) a BaSO.sub.4 :Eu.sup.2+ phosphor, (5) a (Ba, Sr)SO.sub.4 :Eu.sup.2+ phosphor, (6) a MeF.sub.2.pMe'X.sub.2.qKX'.rMe"SO.sub.4 :mEu.sup.2+, nTb.sup.3+ phosphor, wherein Me is at least one of Mg, Ca, Sr and Ba, each of Me' and Me" is at least one of Ca, Sr and Ba, each of X and X' is at least one of Cl and Br, and p, q, r, m and n are numbers which satisfy the conditions of 0.80.ltoreq.p.ltoreq.1.5, 0.ltoreq.q.ltoreq.2.0, 0.ltoreq.r.ltoreq.1.0, 0.001.ltoreq.m.ltoreq.0.10 and 0.ltoreq.n.ltoreq.0.05, respectively, provided q+r.noteq.0, (7) a LnOX:Tm phosphor wherein Ln is La or Gd, and X is Cl or Br, (8) a Ln(Ta.sub.

Abstract: A rare earth phosphor comprising a rare earth oxyhalide phosphor body and cinnamic acid which may have a hydrophobic substituent and which is adhered to or brought in contact with the phosphor body.

Abstract: A process for recovering highly pure rare earth oxides from a waste rare earth phosphor containing at least Fe and/or Ca as impurities, which comprises dissolving the waste rare earth phosphor in an excess amount of a strong acid capable of dissolving the waste rare earth phosphor, adding to the solution at a temperature of at least 70.degree. C. oxalic acid in an amount of from 0.3 to 1.8 times the theoretical amount to obtain precipitates of rare earth oxalates, washing the precipitates with warm water having a temperature of at least 50.degree. C. and then baking them.

Abstract: A monochrome display cathode ray tube which comprises a white emitting fluorescent screen formed on a face plate facing an electron gun to emit cathode rays, said white emitting fluorescent screen being composed essentially of a phosphor mixture comprising from 40 to 70% by weight of a long after-glow red emitting europium-activated indium borate phosphor, from 10 to 40% by weight of a long after-glow green emitting manganese-activated zinc silicate phosphor and from 10 to 50% by weight of a long after-glow blue emitting silver-activated zinc sulfide phosphor.

Abstract: A radiographic intensifying screen comprising a support and a fluorescent layer formed on the support, characterized in that said fluorescent layer is composed essentially of a rare earth oxysulfide phosphor represented by the formula:(Ln.sub.1-x-y-z' Tb.sub.x, R.sub.y, A.sub.z).sub.2 O.sub.2 Swhere Ln is at least one element selected from the group consisting of La, Gd, Y and Lu, R is at least one element selected from the group consisting of Nd and Ho, A is at least one element selected from the group consisting of Pr, Er and Yb, and x, y and z are numbers within the ranges of 0.001.ltoreq.x.ltoreq.0.02, 0.0001.ltoreq.y.ltoreq.0.01 and O.ltoreq.z.ltoreq.0.01, respectively, and x.gtoreq.y+z.

Abstract: A zinc silicate phosphor represented by the formula:(Zn.sub.1-x-2y, M.sup.II.sub.x, Na.sub.2y).sub.2 SiO.sub.4 :Mn.sub.a, As.sub.b, M.sub.c (I)where M.sup.II is at least one element selected from the group consisting of barium, calcium and strontium, M is at least one of antimony and bismuth, and x, y, a, b and c satisfy the conditions of O.ltoreq.x.ltoreq.5.times.10.sup.-2, O.ltoreq.2y.ltoreq.5.times.10.sup.-3, 5.times.10.sup.-5 .ltoreq.a.ltoreq.3.times.10.sup.-2, O.ltoreq.b.ltoreq.5.times.10.sup.-3 and O<c.ltoreq.1.times.10.sup.-2, respectively (provided x+2y.noteq.0).

Abstract: A phosphor having formed on its surface generally spherical or semi-spherical surface treating substance composed of silicon dioxide, an aluminum compound and a zinc compound, at least 70% by weight of the surface treating substance being in the form of particles having an average particle size within a range of from 60 to 300 m.mu.m.

Abstract: A radiographic image conversion screen comprises a support, a first fluorescent layer formed on the support and consisting essentially of a blue emitting phosphor and a second fluorescent layer formed on the first fluorescent layer and consisting essentially of a green emitting rare earth phosphor.