Abstract: An alkaline earth aluminate phosphor for a cold cathode fluorescent lamp, which is represented by the compositional formula a (P1-xEux)O.(Q1-yMny)O.bAl2O3 and which is characterized by emitting light when irradiated with ultraviolet rays having a wavelength of from 180 to 300 nm (provided that in the above formula, P represents at least one alkaline earth metal element selected from Ba, Sr and Ca, Q represents at least one bivalent metal element selected from Mg and Zn, and a, b, x and y represent numbers which satisfy 0.8?a?1.2, 4.5?b?5.5, 0.05?x?0.25 and 0.2?y?0.4, respectively).

Abstract: This invention provides an alkaline earth chlorophosphate phosphor for a blue light emitting cold cathode fluorescent lamp, represented by (Sr10-k-l-m-nBakCalMgmEun)(PO4)6Cl2 wherein 0<k?1.5, 0?1?1.2, 0?m?0.25 and 0.05?n?0.3, a cold cathode fluorescent lamp using a blue light emitting phosphor represented by (Sr10-k-l-m-nBakCalMgmEun)(PO4)6Cl2 wherein 0?k?1.5, 0?1?1.2, 0?m?0.25 and 0.05?n?0.3, and a color liquid crystal display device using the lamp as backlight. The phosphor causes no significant lowering in luminescence brightness over time and no significant change in luminescent chromaticity over time under excitation with ultraviolet light at a wavelength of 180 to 300 nm and, particularly when used as backlight for a liquid crystal display, can realize image display with a wide color reproduction range.

Abstract: A phosphor improved against luminance deterioration with time under vacuum ultraviolet irradiation, a phosphor paste composition, and a vacuum ultraviolet excitation light emitting element high in luminance retaining rate and improved in luminance, are presented. An alkaline earth aluminate phosphor which is a phosphor represented by the formula a (M1-xEux)O.6Al2O3 (wherein M represents at least one alkaline earth metal element selected from the group consisting of Ba, Sr and Ca, and x and a satisfy 0<x<1 and O.9?a?1.8, respectively) and which has a wide-band peak over an angle region of diffraction angle (2?) of from 28° to 31° in powder diffraction X-ray spectrum by CuK?1 characteristics X-ray, and a vacuum ultraviolet excitation light emitting element provided with a fluorescent layer made of the phosphor.

Abstract: The present invention is to provide a phosphor of minimum particle size having an excellent crystallinity and a high brightness higher than conventional crude particles, which is usable for a highly precise display, a highly bright illuminating element or illuminating apparatus, a high speed immunoassay system or the like, i.e. a phosphor having a substantially spherical outer shape, which comprises primary particles having a median diameter D50 in a range of from 0.05 ?m to 1 ?m and secondary particles having a median diameter D50 in a range of from 0.1 ?m to 2 ?m, wherein at least 50 vol % of the total secondary particles has an aspect ratio of at least 0.8 and an internal quantum efficiency is in a range of from 0.8 to 1.

Abstract: A blue-emitting bivalent metal silicate phosphor improved in the luminance efficiency, the durability against deterioration by VUV and the powder characteristic, and a process for its production, a phosphor paste composition employing such an improved phosphor, and a VUV excitation type light-emitting device having high luminance. The phosphor is an Eu-activated bivalent metal silicate phosphor represented by the compositional formula CaMgSi2O6:Eu, wherein a specific amount of at least one member among La, Ba, Sr, Zn, Y, Ce, In, Bi, chlorine, bromine and iodine, is contained in the crystalline matrix.

Abstract: An alkaline earth aluminate phosphor for a cold cathode fluorescent lamp, which is represented by the compositional formula a (P1-xEux)O.(Q1-yMny)O.bAl2O3 and which is characterized by emitting light when irradiated with ultraviolet rays having a wavelength of from 180 to 300 nm (provided that in the above formula, P represents at least one alkaline earth metal element selected from Ba, Sr and Ca, Q represents at least one bivalent metal element selected from Mg and Zn, and a, b, x and y represent numbers which satisfy 0.8?a?1.2, 4.5?b?5.5, 0.05?x?0.25 and 0.2?y?0.4, respectively).

Abstract: The present invention is to provide a phosphor of minimum particle size having an excellent crystallinity and a high brightness higher than conventional crude particles, which is usable for a highly precise display, a highly bright illuminating element or illuminating apparatus, a high speed immunoassay system or the like, i.e. a phosphor having a substantially spherical outer shape, which comprises primary particles having a median diameter D50 in a range of from 0.05 &mgr;m to 1 &mgr;m and secondary particles having a median diameter D50 in a range of from 0.1 &mgr;m to 2 &mgr;m, wherein at least 50 vol % of the total secondary particles has an aspect ratio of at least 0.8 and an internal quantum efficiency is in a range of from 0.8 to 1.

Abstract: The present invention provides a green emitting phosphor which includes an excess of the ordinary SiO2 component included in parent material Y2−2xSiO5 activated by Tb in terms of stoichiometric ratio. The composition of the above phosphor is represented by chemical formula: {(Y1−y−zMyGdz)1−xTbx}2(Si1−bGebO2)1+aO3 where values of x, y, z, a, and b are assigned, subject to 0<x≦1, 0≦y≦1, 0≦z≦1, 0<a≦1, and 0≦b≦1, and M is at least one element selected from a group comprising Sc, In, La, Lu, Yb, Ce, Eu, Sm, Tm, Ho, Er, and Nd. By using this phosphor, phosphors that emit light of higher luminance with less luminance degradation and are suitable for high-quality image display and imaging devices producing high-quality images are obtained.

Abstract: A process for producing fine phosphor particles having a high crystallinity, having a small amount of aggregated particles and comprising fine particles, thus capable of forming a homogeneous and dense high brightness fluorescent layer when applied to e.g. a cathode ray tube, a fluorescent lamp or PDP, and having a high purity, a uniform chemical composition and excellent emission properties, at a low cost, is provided. A process for producing a phosphor, which comprises heating droplets of a solution containing metal elements constituting the phosphor to carry out pyrolysis to obtain the phosphor, wherein the above heating is carried out in the coexistence of an additive comprising a metal or a metal compound to carry out the pyrolysis at an average crystal growth rate of at least 0.002 &mgr;m3/sec.

Abstract: A blue-emitting bivalent metal silicate phosphor improved in the luminance efficiency, the durability against deterioration by VUV and the powder characteristic, and a process for its production, a phosphor paste composition employing such an improved phosphor, and a VUV excitation type light-emitting device having high luminance. The phosphor is an Eu-activated bivalent metal silicate phosphor represented by the compositional formula CaMgSi2O6:Eu, wherein a specific amount of at least one member among La, Ba, Sr, Zn, Y, Ce, In, Bi, chlorine, bromine and iodine, is contained in the crystalline matrix.

Abstract: A gadolinium oxysulfide phosphor for digital radiography represented by the following compositional formula, which mainly emits a green luminescence under excitation with radiation: (Gd1−x−y−z,Tbx,Dyy,Cez)2O2S wherein x, y and z are numbers which satisfy 1.2×10−3≦x≦1.9×10−2, 5×10−4≦y≦19×10−2 and 10−8≦z≦8×10−7, respectively.

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 phosphor for vacuum ultraviolet ray excitation, which comprises a rare earth oxide type phosphor, wherein at least part of the surface of the rare earth oxide type phosphor is coated with a compound containing at least a magnesium element and a phosphorus element.

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 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 process for producing fine phosphor particles having a high crystallinity, having a small amount of aggregated particles and comprising fine particles, thus capable of forming a homogeneous and dense high brightness fluorescent layer when applied to e.g. a cathode ray tube, a fluorescent lamp or PDP, and having a high purity, a uniform chemical composition and excellent emission properties, at a low cost, is provided. A process for producing a phosphor, which comprises heating droplets of a solution containing metal elements constituting the phosphor to carry out pyrolysis to obtain the phosphor, wherein the above heating is carried out in the coexistence of an additive comprising a metal or a metal compound to carry out the pyrolysis at an average crystal growth rate of at least 0.002 &mgr;m3/sec.

Abstract: A gadolinium oxysulfide phosphor for digital radiography represented by the following compositional formula, which mainly emits a green luminescence under excitation with radiation:

Abstract: A radiographic intensifying screen set comprising a pair of a front intensifying screen and a rear intensifying screen, each comprising a support and a plurality of phosphor layers each having a binder resin and a phosphor dispersed therein, provided on the support, wherein at least some of the phosphor layers of the respective front intensifying screen and rear intensifying screen contain a fluorescent dye or a fluorescent pigment which absorbs some of emitted lights from the phosphors and emits lights having other wavelengths, the support for the front intensifying screen is a light-reflective support, and the support for the rear intensifying screen is a light-absorptive support.

Abstract: A phosphor for vacuum ultraviolet ray excitation, which comprises a rare earth oxide type phosphor, wherein at least part of the surface of the rare earth oxide type phosphor is coated with a compound containing at least a magnesium element and a phosphorus element.