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: There is provided a novel method for manufacturing a light-emitting material composed of II-VI group semiconductors having a nano structure crystal and which is optimally doped with an activator. In a manufacturing method for the light-emitting material, a II-VI group semiconductor doped with an activator by a liquid phase reaction having a co-precipitation product is formed and an organic acid is added to the liquid phase reaction system. In another manufacturing method for the light-emitting material, a II-VI group semiconductor doped with an activator by a liquid phase reaction having a product co-precipitation is formed and a high molecular organic acid or polystyrene is added after the end of the liquid phase reaction.

Abstract: A color filter composition, a color display device, and a production method of the same with which an increase of the luminance, an increase of the contrast, an increase in the range of color reproduction, and an improvement of the function for preventing reflection of outside light can be achieved. The color filter composition has a spectral characteristic allowing specific light of the visible region to pass therethrough and is composed of fine particles of an inorganic metal oxide containing 15 percent by weight or less of particles having a particle size of 0.1 .mu.m or more based on the weight of all of the particles and contains 70 percent by weight or more of particles having a particle size of 0.01 .mu.m to 0.07 .mu.m based on the weight of all of the particles. A color filter is formed on an inner surface of a panel of a display device by screen printing or heat transfer printing by using this color filter composition.

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: In a cathode-ray tube, a phosphor screen is formed by employing a blue phosphor obtained by mixing Cu with ZnS:Ag, Al in a normal solid phase reaction, then forming the phosphor solution on the inner surface of a panel of a cathode ray tube. The resulting cathode-ray tube can have increased brightness with negligible loss of chromacity. The amount of Cu as a co-activator in the blue phosphor can range between 0.6 to 1.5 ppm. In a preferred embodiment, the blue phosphor has a chromacity y-value of 0.089.

Abstract: A color filter composition, a color display device, and a production method of the same with which an increase of the luminance, an increase of the contrast, an increase in the range of color reproduction, and an improvement of the function for preventing reflection of outside light can be achieved. The color filter composition has a spectral characteristic allowing specific light of the visible region to pass therethrough and is composed of fine particles of an inorganic metal oxide containing 15 percent by weight or less of particles having a particle size of 0.1 .mu.m or more based on the weight of all of the particles and contains 70 percent by weight or more of particles having a particle size of 0.01 .mu.m to 0.07 .mu.m based on the weight of all of the particles. A color filter is formed on an inner surface of a panel of a display device by screen printing or heat transfer printing by using this color filter composition.

Abstract: A method of forming a fluorescent screen, such as a black matrix or a color filter, on a front panel of a cathode ray tube is described. The method comprises the steps of forming a photosensitive adhesion layer on an inner surface of the front panel, exposing the photosensitive adhesion layer through a color selecting electrode having a plurality of slots for reducing adhesion level of exposed area of the photosensitive adhesion layer, bringing a pigment layer provided on a supporting sheet into intimate contact with the photosensitive adhesion layer, applying pressure to the pigment layer and the photosensitive layer, and peeling off the supporting sheet from the pigment layer. Alternatively, a pigment may be dispersed in the photosensitive adhesion pigment 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: An ultraviolet radiation projector of this invention includes a focusing optical member arranged between an exposure surface of an ultraviolet sensitive material and a panel surface of a CRT for emitting an ultraviolet beam to expose the exposure surface which is kept separated from the focusing optical member, thereby preventing contact between the exposure surface and the focusing optical member. An optical image forming apparatus of this invention can form a high-precision two-dimensional image for an electronic circuit pattern by exposing the exposure surface with a pattern corresponding to a desired electronic circuit pattern using the ultraviolet radiation projector as a light source. In addition, sheet-like resins cured by the exposure with the ultraviolet beam using the ultraviolet radiation projector as a light source are sequentially stacked to form a desired high-precision three-dimensional image.

Abstract: A fluorescent material of small size is prepared by synthesizing a fluorescent material of predetermined molecular structure in a single phase, pulverizing the fluorescent material thus produced and then heat treating the pulverized material under conditions sufficient to recover the luminance characteristics which were lost as a result of pulverizing.

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 method for manufacturing a luminescent material having the formula:Y.sub.3 Al.sub.5 O.sub.12 : Tbin which the raw materials for the synthesis are combined in appropriate amounts together with a flux consisting of barium fluoride, barium chloride, or mixtures of the two and then heated in a sealed state to a temperature between about 1300.degree. C. and 1600.degree. C. The resultant product is then leached with an alkaline or acid solution to remove the residual flux from the product.