Abstract: The method of surface-treating dry-powdered phosphor particles for use in manufacturing a viewing screen for a CRT to control the triboelectric charge characteristics of the phosphor particles includes the steps of dissolving a suitable quantity of a polymeric coupling agent in a suitable solvent to form a mixture, surface-treating the phosphor particles by adding them to the mixture to provide a coating of the coupling agent thereon, and then drying the surface-treated phosphor particles. The resultant dry-powdered surface-treated phosphor particles are used to make a luminescent viewing screen for a CRT. The coupling agent controls the triboelectric charge characteristics of the phosphor particles during the electrophotographic manufacturing of the screen.

Abstract: Blue-luminescing lanthanum-gadolinium-oxybromide, activated by trivalent cerium, which oxybromide is also activated by trivalent terbium and is defined by the molecular formulaLa.sub.1-x-y-z Gd.sub.x Ce.sub.y Tb.sub.z OBr,in which0.25.ltoreq.x.ltoreq.1-y-z,0.002.ltoreq.y.ltoreq.0.05,0.0001.ltoreq.z.ltoreq.0.005 and y.ltoreq.z.

Abstract: This invention relates to a phosphor prepared by mixing a green emitting phosphor InBO.sub.3 :Tb having an excellent color tone with other green emitting phosphors having a short decay time such as Y.sub.3 Al.sub.5-m Ga.sub.m O.sub.12 :Tb in amounts such that the "decay time to 10% of peak brightness" measured by a raster spot method is below 10 ms. The phosphor screen of a projection cathode-ray tube is formed by use of this phosphor. The projection cathode-ray tube thus produced has an excellent color tone and a short decay time.

Abstract: Certain yttrium orthosillicate phosphors doped with various rare-earths are particularly suitable for use in various display devices including cathode ray tubes. Included are single crystal phosphors which exhibit high brightness and long life under high energy excitation and conventional powder phosphors with great sensitivity.

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: Light output of single crystal phosphors used on cathode ray tubes can be vastly improved by use of a microfaceted surface structure conveniently produced by use of a single crystal epitaxial layer with lattice constant slightly larger than the single crystal substrate. Such epitaxial layers are conveniently grown using substituents that increase the lattice constant compared to the single crystal substrate.

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 cathode-ray tube according to the present invention is provided with a phosphor screen comprising phosphors A, B, and C, wherein each of the phosphors A and B constitute 5 to 15% by weight and, the phosphor C constitutes 70 to 90% by weight. The phosphor A is a bluish white-emitting phosphor (Y.sub.1-x-y Gd.sub.x Tb.sub.y).sub.2 O.sub.2 S (0.ltoreq.X.ltoreq.0.999999 and 0.000001.ltoreq.Y.ltoreq.0.001), the phosphor B is at least one of a blue-emitting silver-activated hexagonal zinc sulfate (ZnS:Ag) phosphor, etc., and the phosphors C is a yellow-emitting phosphor (In.sub.1-p-r M.sub.p TB.sub.q Eu.sub.r BO.sub.3) (wherein M is at least one element selected from the group consisting of Sc, Lu, Y, Gd, and Ga, and p, q, and r satisfy 0.ltoreq.p.ltoreq.0.2, 0.0005.ltoreq.q.ltoreq.0.05, and 0.001.ltoreq.r.ltoreq.0.1). The cathode-ray tube of the present invention is a phosphor screen which is free from toxicity and has good flickering and brightness characteristics and high current dependence of brightness.

Abstract: In a cathode ray tube with a phosphor screen containing a Zn type green emitting phosphor, e.g. ZnS, ZnCdS and Zn.sub.2 SiO.sub.4, the surface of the phosphor particle includes a surface area of (Co,Zn)O. The surface area is green colored to operate as a filter against incident light from outside the tube and reduces background brightness of picture images caused by excitation of scattering electrons. Thus, the contrast of the picture images rises. The contrast is further increased by Ni doped.

Abstract: A novel epitaxial phosphor having high luminosity at about 540 nm has the composition (Y.sub.3-x-y Tb.sub.x RE.sub.y)(Al.sub.5-w Ga.sub.w)O.sub.12, with RE being one (or more) 4f-type rare earth(s) other than Tb, 0.09<x<0.7, and 1.5<w<2.5. In preferred embodiments, RE is Lu, Yb, or Tm, 0.1<x<0.3, and 1.8<w<2.2. In further preferred embodiments, the phosphor composition is adjusted to yield a material having a lattice constant within 0.002 nm of the lattice constant of the substrate, typically Y.sub.3 Al.sub.5 O.sub.12. The phosphor is typically grown by liquid phase epitaxy and has application in a variety of apparatus, including avionic displays and flight simulators.

Abstract: A phosphor for use in CRTs comprises (Y.sub.3-p-m-n R.sub.p Pr.sub.m Tb.sub.n)(Al.sub.5-q Z.sub.q)O.sub.12, where R is a lanthanide element and Z is a Group III element. One embodiment described is a single crystal of (Y.sub.3-m-n Pr.sub.m Tb.sub.n)Al.sub.5 O.sub.12 in which the trivalent Pr and Tb activators exhibit co-emission and the phosphor emits white light.

Abstract: Color picture reproduction in which a monochromatic CRT having emissions in the blue, green and red regions successively displays blue, green and red picture signals. The separate color displays are filtered by blue, green and red filters before being imaged on a color print material. The phosphors of the CRT are selected to reduce the blue emissions below the green and red emissions.

Abstract: A multi-layer luminescent screen includes a luminescent crystalline sublayer and a faceted overlayer. The faceted overlayer causes the emission from the screen of a greater fraction of the luminescence than would otherwise be the case. The screens, which are typically cathodoluminescent, find application in computer displays, lithography, and flying spot scanners.

Abstract: Disclosed is a cathode ray tube including a white emitting phosphor screen comprising, in mixing, a blue emitting phosphor having the composition expressed by a composition formula (M.sub.1-x Tb.sub.x).sub.2 O.sub.2 S (wherein M is Y and/or Gd, and the range of x is 0<x.ltoreq.0.01) and at least one other phosphor which does not contain Cd. This cathode ray tube has less luminance deterioration and burning of the phosphor screen, and it causes no pollution.

Abstract: According to the present invention, there is provided a color cathode ray tube of multi-purpose use in which as a red phosphor of a color phosphor screen, (ZnCd)S : Ag or (ZnCd)S : Cu phosphor of short decay time is added to rare earth phosphor to have an adding amount of 5 to 30 weight % relative to the total amount of red phosphor so that with respect to the red light emission, the high visibility brightness similar to that of the ordinary color television picture tube can be obtained. Also, since the brightness is lowered rapidly in the early stage of the light emission, the address detection can be carried out positively by, for example, a light pen pick-up.

Abstract: An index type color picture tube having a stripe type fluorescent screen with strips of a zinc sulfide-based green color phosphor, a zinc sulfide-based blue color phosphor, a red color phosphor which is a mixture of a Y.sub.2 O.sub.2 S:Eu phosphor containing not more than 2 ppm of Tb and a Y.sub.2 O.sub.3 :Eu phosphor, or a Y.sub.2 O.sub.2 S:Eu phosphor containing 5 to 30 ppm of Tb, and a phosphor for index detection has a uniform current-brightness characteristic of tricolor phosphors, and a less variation in white color tone of the picture reproduced over a range of from low current to high current.

Abstract: A cathode-ray tube provided with a luminescent screen comprising a luminescent indium orthoborate activated by trivalent chromium. The tube yields an efficient emission in the near infrared part of the spectrum. If the borate further comprises Eu as an activator, an efficient Eu.sup.3+ emission is obtained in addition to the Cr emission.

Abstract: A color picture tube fitted with a phosphor screen formed of a green-emitting phosphor prepared from copper and aluminum-activated zinc sulfide, a red-emitting phosphor prepared from europium-activated yttrium oxysulfide, and a blue-emitting phosphor prepared from silver-activated zinc sulfide, and wherein the copper concentration ranges between 0.01 and 0.03% by weight and the europium concentration ranges between 5.1 and 6.1% by weight.

Abstract: Undesired light radiations emitted by europium activated red luminescent phosphors employed in projection color televisions are greatly reduced, with essentially no reduction in the desired radiation, by employing as a filter a solution containing a soluble holmium salt and a soluble neodymium salt.

Abstract: In an index type color picture tube including a stripe type fluorescent screen having stripe-shaped phosphor layers for green, blue and red color and a stripe-shaped phosphor layer for index detection, the phosphor for red color phosphor layer comprises a Y.sub.2 O.sub.2 S:Eu phosphor containing 0.01 to 3 ppm of either one or both of Tb and Pr.

Abstract: A display tube comprising in an evacuated envelope means to generate at least one electron beam which is focused on a display screen and describes a field thereon, which display screen comprises a terbium-activated blue-luminescing phosphor on a carrier, and in which the light emitted by the phosphor falls through a filter. If the energy of the emissions of the phosphor which find their origin in the .sup.5 D.sub.3 -level of terbium is at least 40% of the energy of the emissions of all terbium levels and the filter has a transmission of more than 75% at those wavelengths where the .sup.5 D.sub.3 .fwdarw..sup.7 F.sub.5 and the .sup.5 D.sub.3 .fwdarw..sup.7 F.sub.4 emissions of terbium are located and the filter has a transmission of less than 10% at those wavelengths where the .sup.5 D.sub.4 .fwdarw..sup.7 F.sub.5 and the .sup.5 D.sub.4 .fwdarw..sup.7 F.sub.4 and the .sup.5 D.sub.4 .fwdarw..sup.7 F.sub.3 emissions of terbium are located so that the color point of the filtered light is located in the range x.

Abstract: Disclosed is an orange to yellow emitting phosphor, comprising an europium and terbium co-activated indium borate represented by the chemical compositional formula:(In.sub.1-a-b Eu.sub.a Tb.sub.b)BO.sub.3wherein a and b are 0.0001.ltoreq.a.ltoreq.0.04, 0.0001.ltoreq.b.ltoreq.0.04.

Abstract: A green emitting phosphor for heavily loaded cathode-ray tubes comprises a mixture of a deep-green and a yellowish-green emitting phosphor. Mixtures of Zn.sub.2 SiO.sub.4 :Mn and at least one phosphor from the group comprising Y.sub.2 SiO.sub.5 :Tb; X.sub.2 O.sub.2 S:Tb; ES:Ce and XOZ:Tb, where X=Y, La, Gd, Lu; E=Ca, Sr, Ba; and Z=Cl, Br, I, F; satisfy, as FIG. 1 illustrates for a few examples, the EBU specification.

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: Disclosed is a white luminescent phosphor for use in a cathode ray tube, which comprises a mixture of at least one phosphor having a composition of the following formula:In.sub.1-p-q-r M.sub.p Eu.sub.q Tb.sub.r BO.sub.3wherein M represents at least one element selected from the group consisting of Sc, Lu, Y, La, Gd and Ga; and each of p, q and r represents a number satisfying the relationships of p.gtoreq.0, q.gtoreq.0, r.gtoreq.0 and 0<p+q+r<1, and having a 10% afterglow period of 10 milliseconds or longer, and a blue luminescent phosphor having the composition of ZnS:Ag.

Abstract: A rear earth yellow to red emitting phosphor exhibiting the sublinear characteristics when the current density of an excitation electron beam is increased. The phosphor is represented by the general formula:(Ln.sub.1-x-y,Eu.sub.x,Ce.sub.y).sub.2 O.sub.2 Sin which Ln is at least one of yttrium, gadolinium, lanthanum and lutetium, x is a number satisfying 10.sup.-4 .ltoreq.x.ltoreq.9.times.10.sup.-2, preferably 10.sup.-2 .ltoreq.x.ltoreq.8.times.10.sup.-2, and y is a number satisfying 10.sup.-6 .ltoreq.y.ltoreq.2.times.10.sup.-3, preferably 2.times.10.sup.-6 .ltoreq.y.ltoreq.10.sup.-3. It exhibits a wide reproduced color range, and free of color drift at a high current. The phosphor is suitable for use in a multi-color cathode ray tube and a multi-color low-velocity electron excited fluorescent display device, and makes it possible to realize a high-performance electronic display unit.

Abstract: A phosphor which emits white light upon excitation and is characterized by a long decay time, the phosphor consisting of a host material of calcium silicate having the formula:CaO.xSiO.sub.2where x is in the range from 0.5 to 1, and an activator consisting of dysprosium (Dy) in the ratio of 0.05 to 10 mol % of each 1 mol of the host material.

Abstract: A cathode-ray display tube for color printers has a phosphor screen comprises a blue-emitting phosphor having a maximum ability of color emission in the range of wavelengths of 480 m.mu. and below with a radiant energy in the range of wavelengths of about 480 m.mu. and higher being 10% or less of the overall radiant energy; a green-emitting phosphor having a maximum ability of color emission in the range of wavelengths of 520 through 570 m.mu. with a radiant energy in the range of wavelengths of about 500 m.mu. and less and of about 630 m.mu. and higher being 5% or less of the overall radiant energy; and a red-emitting phosphor having a maximum ability of color emission in the range of wavelengths of 630 through 750 m.mu. with a radiant energy in the range of wavelengths of about 590 m.mu. and less being about 10% or less of the overall radiant energy.Phosphor dots located beyond the area of normal raster are sensed to provide timing signals for controlling beam deflection.

Abstract: A fluorescent lamps having colors similar to standard daylight can be prepared using two component compositions. A blue emitting phosphor having a peak emission with a specified range and a 50% band width within a specified range along with specific amounts of a yellow-emitting phosphor having a 50% band width within a specified range and a peak emission within a specified range provide a daylight lamp with a higher lumer per watt than the standard daylight lamp.

Abstract: A green-emitting phosphor for a cathode-ray tube contains calcium sulfide activated by cerium and lithium. Decreases in the brightness when the tube is excited with an electron beam of high current densities or is subjected to high temperatures are eliminated.

Abstract: This invention relates to luminescent materials, especially to such materials of the type comprising cerium activated yttrium aluminium garnets which may be used in cathode-ray tubes for flying spot scanning devices.In more detail the luminescent material of the invention comprises a yttrium-scandium-gallium-aluminium garnet activated by trivalent cerium and having the formula:Y.sub.3-x Ce.sub.xSc.sbsb.y Ga.sub.z Al(.sub.5-(y+z)).sup.O 12in which 0.02.ltoreq.x.ltoreq.0.1, 0.5.ltoreq.y.ltoreq.2 and 1.ltoreq.z.ltoreq.3, provided that (y+z) is less than 5.

Abstract: Disclosed is a filter-coated phosphor having phosphor particles coated with filter particles formed of pigments of the same color as that of light emitted from the phosphor, the phosphor particles coated with the filter particles being additionally coated with a borate compound. According to this filter-coated phosphor, the filter particles never exfoliate from the surfaces of the phosphor particles in a slurry, satisfactory dispersibility is obtained in the slurry, and the slurry pH is stable. A phosphor screen of a color picture tube obtained with use of the filter-coated phosphor exhibits highly outstanding contrast and luminous efficiency.

Abstract: An europium activated oxysulfide phosphor represented by the formulaLn.sub.2 O.sub.2 S:Eu,(Sm)wherein Ln is at least one element selected from the group consisting of yttrium, gadolinium, lanthanum, lutetium and scandium is colored into red by mixing therewith a proper amount of calcium salt solely or together with strontium salt, and firing the resulting mixture at a temperature within the range of 1000.degree. to 1500.degree. C. By the firing, a CaS:Eu,(Sm) phosphor or a (Ca,Sr)S:Eu,(Sm) phosphor having a red body color is produced in an external portion of the Ln.sub.2 O.sub.2 S:Eu,(Sm) phosphor particle. The red colored phosphor thus obtained is used as a red emitting phosphor of a high contrast cathode ray tube for color television.

Abstract: A luminescent screen provided with a luminescent material having the hexagonal crystal structure, which material is an aluminate, a gallate or an aluminate gallate. The crystal structure of the luminescent material corresponds to that of at least one of the compounds .beta.-aluminium, .beta."-alumina and the hexagonal ferrites. The luminescent material is activated by at least one of the elements manganese, europium, lead, thallium, cerium, indium, terbium, dysprosium and bismuth and is a ternary compound whose composition can be represented in the ternary phase diagram ABC in which A represents at least one of the oxides 1/4Na.sub.2 O, 1/2K.sub.2 O, 1/2Rb.sub.2 O, 1/2Cs.sub.2 O, CaO, SrO, BaO, 1/2La.sub.2 O.sub.3, 1/2Ce.sub.2 O.sub.3, 1/2Tb.sub.2 O.sub.3, 1/2Dy.sub.2 O.sub.3, 1/2Bi.sub.2 O.sub.3, EuO, PbO, 1/2Tl.sub.2 O and 1/2In.sub.2 O, in which B represents at least one of the oxides Al.sub.2 O.sub.3 and Ga.sub.2 O.sub.3 in which up to 25 mol. % of the oxides denoted by B may be replaced by Sc.sub.2 O.

Abstract: A red emitting phosphor having a low luminous reflectance, comprising a rare earth element-based phosphor body activated by europium and a red pigment coated on the phosphor body, is disclosed, the pigment being formed of indium sulfide or of a combination of indium sulfide and an alkali metal sulfate. The phosphor is produced by coating the phosphor body with a complex compound containing of indium sulfide and an alkali metal sulfide, followed by baking in an oxygen containing atmosphere at 400.degree. to 600.degree. C. so as to convert the complex compound into a red pigment consisting of indium sulfide and an alkali metal sulfate.

Abstract: The disposition of an array of color phosphor dots on a color cathode ray tube faceplate by conventional photo deposition techniques is facilitated by first coating the individual phosphor particles with polyvinyl alcohol modified with an amino acid such as glutamic or aspartic acid.

Abstract: A color television cathode ray tube which comprises a phosphor screen formed of (A) a red-emitting phosphor selected from the group consisting of europium-activated rare earth metal oxide and europium-activated rare earth metal oxysulfide; (B) a green-emitting phosphor selected from the group cosisting of a mixture of copper-activated zinc sulfide and gold-activated aluminum-coactivated zinc sulfide and copper- and gold-activated zinc sulfide; and (C) a blue-emitting phosphor of silver-activated zinc sulfide, and wherein the green-emitting phosphor contains 0.005 to 0.02% by weight of copper and 0.005 to 0.15% by weight of gold based on the total amount of the green-emitting phosphor; and current running through the cathodes of electron guns for exciting the red-, green- and blue-phosphors can be made to have a substantially equal amount for the respective electron guns.

Abstract: A cubic ZnS:Cu,Al phosphor and a cubic ZnS:Au,Al phosphor is mixed to provide a green emitting phosphor coposition. This composition emits green light having a color which is represented by a color point in the CIE standard chromaticity diagram having x-value and y-value within the ranges of 0.300<x<0.360 and 0.575<y<0.635, respectively, when excited by an electron beam. A color television cathode ray tube uses the fluorescent composition as a green emitting phosphor component, and a ZnS:Ag phosphor or a ZnS:Ag,Al phosphor as a blue emitting phosphor component, and a Y.sub.2 O.sub.2 S:Eu phosphor, a Y.sub.2 O.sub.3 :Eu phosphor or a YVO.sub.4 :Eu phosphor as a red emitting phosphor component.

Abstract: A luminescent material comprising a rare earth fluoride host activated with manganese. The material also may include another element such as titanium or zirconium. The material may be used as a coating on the face plate of a cathode ray tube.

Abstract: An admixture of Yttrium oxide, or yttrium oxysulfide, or yttrium oxide or yttrium oxysulfide activated by a rare earth element and P1 phosphor, manganese-activated zinc orthosilicate provides a viewable bistable storage target for cathode ray tubes having increased operating life.

Abstract: A cathode-ray tube, such as a color television tube, formed from a glass containing up to 20 percent by weight of strontium oxide as an essential ingredient thereof, which tube has imparted thereto improved X-ray absorbing properties without any material increase in the X-ray and electron browning of the glass.

Abstract: A cathode-ray tube, such as a color television tube, formed from a glass containing up to 20 percent by weight of strontium oxide as an essential ingredient thereof, which tube has imparted thereto improved X-ray absorbing properties without any material increase in the X-ray and electron browning of the glass.

Abstract: Rare earth oxysulfide phosphors consisting essentially of a compound of a general formula, {(Y.sub.u Gd.sub.1-u).sub.1-x-y-z Eu.sub.x Sm.sub.y (Tb.sub.1-p, Pr.sub.p).sub.z}.sub.2 .sup.. O.sub.2 S, wherein 0 .ltoreq. z .ltoreq. 1 .times. 10.sup.-4, 0 .ltoreq. p .ltoreq. 1, 0 .ltoreq. u .ltoreq. 1, and x and y satisfy the area B, defined by a, b, c and d of FIG. 5.These phosphors are well adapted for use in a color television picture tube.

Abstract: Color correction is provided in a high-pressure mercury vapor discharge lamp with a particular combination of two different phosphor materials producing an efficient composite emission. A blend of said phospor materials can improve color rendition without effecting any significant reduction in the lamp lumen output.

Abstract: The device comprises an electroluminescent layer and means for exciting the electroluminescent layer to luminescence with an electric field. The electroluminescent layer comprises a cathodoluminescent phosphor normally having a bulk resistivity greater than 10.sup.11 ohm-centimeters containing a sufficient quantity of indium oxide and/or tin oxide therein to produce a bulk resistivity of less than 10.sup.10 ohm-centimeters in the electroluminescent layer. The preferred electroluminescent layers are red emitting solid solutions of yttrium oxide, europium oxide, and indium oxide which are prepared by radio frequency sputtering.

Abstract: A white light source is described in which a trivalent metallic ultraphosphate is irradiated with a low voltage electron beam. The metallic ions are generally restricted to the lanthanide rare earth ions and yttrium. The material so irradiated emits light in a spectral continuum centered in the visible portion of the electro-magnetic spectrum. This emission is, however, in addition to any narrow bandwidth light emission of the type generally associated with a transition of the metallic ion involving the electrons of the 4f shell.

Abstract: The invention comprises a method of buffering rare-earth oxide phosphor slurries to control the pH thereof and thereby retard the formation of undesirable complexes.

Abstract: In a color picture tube having a phosphor screen with three kinds, i.e., red, blue and green phosphor dots or phosphor strips, the red phosphor dots or strips are formed by employing europium-activated yttrium oxide (Y.sub.2 O.sub.3 :Eu) phosphor powder, each particle of which powder is coated with thin layer of europium-activated oxysulfide (Y.sub.2 O.sub.2 S:Eu) phosphor. By means of such thin coating of the oxysulfide phosphor, the conventional adverse active characteristic of Y.sub.2 O.sub.3 :Eu against photo-hardening agent in the phosphor slurry used in forming phosphor screen is eliminated, thereby increasing the uniformity of the red light emission and decreasing the U-V light exposure time in the screen forming process.

Abstract: Rare earth oxysulfide phosphors with excellent optical properties and optimum particle size control for use as cathodo-luminescent phosphors in cathode ray tubes are prepared by treating a solution of at least one salt of a rare earth metal and a salt of a rare earth activator to form solid salts and thereafter heating the oxidic compound with a sulfidizing agent and a silicon sensitizer, preferably in the presence of a fluoride. The rare earth oxysulfide phosphors thus obtained contain from 10 to 1,000 p.p.m. silicon sensitizer and, if used, 20 to 500 p.p.m. fluoride, incorporated in the crystal lattice structure.

Abstract: A cathode-ray tube particularly for flying spot scanners, provided with a luminescent silicate activated by cerium, defined by the formula Li.sub.1-x Na.sub.x Y.sub.1-p Ce.sub.p SiO.sub.4, in which 0 .ltoreq. x .ltoreq. 0.90 and 0.0001 .ltoreq. p .ltoreq. 0.25, which silicate has the olivine crystal structure.