Abstract: The present invention provides a method for manufacturing a luminescent material whereby the surfaces of phosphor particles are uniformly coated with glass, and a luminescent material made up of such particles is easily obtainable, a luminescent material manufactured by the manufacturing method, and a display substrate and a display apparatus having the luminescent material. The luminescent material is manufactured through the steps of adding a phosphor in the form of a solid solution comprising a sulfide or an oxysulfide, and a luminescent center substance incorporated in the sulfide or the oxysulfide in an aqueous solution containing water glass with stirring; adding the resulting aqueous solution to an aqueous solution of a metallic salt with stirring; forcedly extracting particles of the phosphor from the resulting aqueous solution; and drying the particles of the phosphor extracted.

Abstract: The present invention proposes a Braun Tube for projectors having an illuminant layer provided on a phosphor screen, the illuminant layer including Zinc Silver Aluminum Oxide (ZnS:Ag, Al) as a blue color illuminant; Yttrium Terbium Silicate (Y2SiO5:Tb) as a green color illuminant; and Yttrium Europium Oxide (Y2O3:Eu) as a red color illuminant, all illuminants having particle size of 5 to 7 &mgr;m. As a result, it is possible to realize a Braun Tube for projectors, in which an extended life cycle is achieved by constraining the degradation of the illuminant, constraining the browning phenomenon as well as improving the spot size of the electron beam thereof.

Abstract: A manufacturing method for a nanocrystal light emission substance having a nano structure crystal, doped with an activator and cured with ultraviolet light. The nanocrystal light emission substance is synthesized by a liquid phase co-precipitation process. During the liquid phase reaction, an organic acid, such as acrylic acid or methacrylic acid, is added. Alternatively, a high molecular organic acid, such as polyacrylic or polymethacrylic acid, polystyrene, is added after the liquid phase reaction. The resulting substance is then cured with ultraviolet light.

Abstract: The present invention provides a method for manufacturing a luminescent material whereby the surfaces of phosphor particles are uniformly coated with glass, and a luminescent material made up of such particles is easily obtainable, a luminescent material manufactured by the manufacturing method, and a display substrate and a display apparatus having the luminescent material. The luminescent material is manufactured through the steps of adding a phosphor in the form of a solid solution comprising a sulfide or an oxysulfide, and a luminescent center substance incorporated in the sulfide or the oxysulfide in an aqueous solution containing water glass with stirring; adding the resulting aqueous solution to an aqueous solution of a metallic salt with stirring; forcedly extracting particles of the phosphor from the resulting aqueous solution; and drying the particles of the phosphor extracted.

Abstract: A fluorescent material is disclosed which is excellent in the intensity of color and brightness and suitable for a FED and a precise CRT. The fluorescent material is prepared by co-activating yttrium oxide fluorescent material activated with europium. The means particle size is 10 nm to 100 nm. To prepare the fluorescent material, basic carbonate activated with europium and zinc is used as a precursor which is then baked. The precursor is prepared by a liquid-phase reaction. Specifically, yttrium nitrate, europium nitrate and zinc acetate are allowed to react in a solution together with sodium carbonate. The prepared precursor is baked by a quick heating and cooling As an alternative to this, the precursor is baked together with flux (phosphate of alkali metal).

Abstract: In a method for manufacturing a phosphor screen of a cathode ray tube, a first photo-resist layer is coated on an inner surface of a panel of the cathode ray tube except at predetermined locations. A second photo-resist layer dispersed with pigment particles is coated on the first photo-resist layer and at the predetermined locations. The second photo-resist layer is exposed at the predetermined locations from an opposite side of the panel. The first photo-resist layer is dissolved and the second photo-resist layer is removed from the first photo-resist layer so as to form a color filter layer at the predetermined locations. A phosphor layer is formed on the color filter layer.

Abstract: A phosphor screen (10) formed of respective color phosphor layers (9R), (9G), (9B) and respective color filter layers (4R), (4G), (4B) is formed on the inner surface of the panel (1). In that case, the respective color filter layers (4R), (4G), (4B) are respectively formed between the inner surface of the panel (1) and the phosphor layers (9R), (9G) and (9B). Therefore, the color cathode ray tube can be made high in contrast and in brightness.

Abstract: A cathode-ray tube includes a phosphor screen having a tricolor phosphor layer composed of a red phosphor, a green phosphor of ZnS:Cu, Al activated with Ni, Fe, or Co, and a blue phosphor of ZnS:Ag activated with Ni, Fe, or Co. The green phosphor and the blue phosphor have a decay intensity of at most 0.5% upon elapse of 8 milliseconds after excitation is removed therefrom. The green phosphor of ZnS:Cu, Al activated with Ni and the blue phosphor of ZnS:Ag activated with Ni have their afterglow characteristics substantially equalized to the afterglow characteristics of the red phosphor of Y.sub.2 O.sub.2 S:Eu.

Abstract: A display device such as a color phosphor display panel has a panel assembly comprising a faceplate, a pair of spaced side plates, and a backplate 1c which are joined together to provide an evacuated interior space. The display device includes a color filter layer having red, green, and blue filters disposed on the inner surface of the faceplate, the filter layer containing fine particles of inorganic metal compounds. A plurality of phosphor layers of ZnO:Zn are disposed on the color filter layer. A grid is disposed in spaced relation between the phosphor layers and a cathode for controlling a flow of thermions emitted from the cathode toward the phosphor layers. The fine particles of inorganic metal compounds have a particle size ranging from 0.01 .mu.m to 0.02 .mu.m. Preferably, the red filter contains fine particles of Fe.sub.2 O.sub.3, the green filter contains fine particles of TiO.sub.2.ZnO.CoO.NiO, and the blue filter contains fine particles of CoO.Al.sub.2 O.sub.3.

Abstract: A minute-particle iron oxide red pigment slurry is formed by adding sodium silicate to a minute-particle iron oxide red pigment slurry, and used to form a red filter formed between a phosphor layer of a color cathode ray tube and a panel thereof. Therefore, even if the red filter is brought in contact with a black matrix under the condition of a process of manufacturing the color cathode ray tube at high temperature, the red filter does not discolor the black matrix.

Abstract: A phosphor screen (10) formed of respective color phosphor layers (9R), (9G), (9B) and respective color filter layers (4R), (4G), (4B) is formed on the inner surface of the panel (1). In that case, the respective color filter layers (4R), (4G), (4B) are respectively formed between the inner surface of the panel (1) and the phosphor layers (9R), (9G) and (9B). Therefore, the color cathode ray tube can be made high in contrast and in brightness.

Abstract: Respective phosphor layers (3R), (3G) and (3B) and a light absorption layer (2) are formed on the inner surface of a panel. An intermediate layer (11) is selectively formed on the surfaces of the respective phosphor layers by using a water soluble liquid having photosensitivity and containing water dispersion vinyl polymer emulsion and partial saponification polyvinyl acetate-system photosensitizer and then a metal-backing layer (12) is formed. A color purity of a phosphor screen can be increased and a brightness thereof can be improved.

Abstract: A method of forming a phosphor screen in which a color filter layer is formed between a phosphor layer and an inner surface of a panel having a slurry in which a fine particle pigment and transparent particles are dispersed into a photosensitive liquid coated on the inner surface of the panel. Then, the color filter layer is formed by exposure and development. When the color filter layer that constitutes one portion of a phosphor screen of a color cathode ray tube is formed in this manner, an adhesive force with which the color filter layer is bonded onto the panel can be increased and a transmittance of the color filter layer can be improved.

Abstract: A green light emitting phosphor comprising tetravalent elements added to a green light emitting phosphor, Y.sub.3 (Al,Ga).sub.5 O.sub.12 :Tb, wherein the green light emitting phosphor can prevent a so-called electron beam burning even when excited by electron beams of high energy. The green light emitting phosphor is, particularly suitable to be applied to a projector tube or a high-brightness phosphor display tube.