Abstract: A phosphor composition contains phosphor particles and a water-soluble rare earth compound uniformly covering the surfaces of the phosphor particles. The rare earth compound is present in an amount of from 0.001 to 5% by weight in terms of the corresponding rare earth oxide, based on the weight of the phosphor particles.

Abstract: A phosphor composition contains phosphor particles and a water-soluble rare earth compound uniformly covering the surfaces of the phosphor particles. The rare earth compound is present in an amount of from 0.001 to 5% by weight in terms of the corresponding rare earth oxide, based on the weight of the phosphor particles.

Abstract: A phosphor-coating composition contains phosphor particles, particles of a rare earth compound, a binder, and a dispersing medium. The rare earth compound is present in an amount of 0.001 to 5% by weight in terms of the corresponding oxide.

Abstract: In a cathode-ray tube phosphor, a layer consisting of a substantially uniform SiO.sub.2 film or an organic film consisting essentially of at least one type of a polymer selected from the group consisting of an acrylic resin, gelatin, alginic acid, chitosan, and a urea resin is formed as a first layer on the surface of a phosphor particle, and a layer containing at least one type of a metal selected from the group consisting of Zn, Al, and an alkali earth metal and at least one member selected from the group consisting of a colloidal silica, an alumina sol, and a titania sol each having a particle size of 50 nm or less is formed as a second layer on the first layer. This phosphor is excellent in oxidation resistance and dispersibility.

Abstract: A method of reclaiming a phosphor from a recovered phosphor slurry containing carbon, a bichromate, and polyvinyl alcohol, comprises, (a) a decomposition treatment step of adding an alkali to the recovered phosphor slurry after the slurry is heated to prepare a phosphor suspension having an alkali concentration of 0.5N or less in the slurry, and adding an oxidizing agent in an amount of 1.0 to 20.0 wt % with respect to a dry solid component of the suspension, (b) a weak acid treatment step of separating a phosphor from the suspension, and adding a weak acid to a suspension obtained by adding water to the separated phosphor, thereby adjusting a pH to be 3.0 to 5.0, and (c) a surface treatment step of treating the surface of the phosphor separated from the suspension.

Abstract: Crystals of a gallium nitride-based compound semiconductor are grown on the surface of a buffer layer represented by formula Ga.sub.X Al.sub.1-X N (0<.times..ltoreq.1). The crystallinity of the gallium nitride-based compound semiconductor grown on the surface of the buffer layer can be drastically improved.

Abstract: The phosphor and the X-rays intensifing screen according to the present inventin emit light by the excitation of X-ray, and they are used for medical and industrial radiography. In addition to the conventional contents of rare earth tantalate and/or rare earth niobate, the phosphor according to the present invention contains a determined quantity of divalent metal. This divalent metal content can make the improvement of the afterglow characteristic and the light emission characteristic of the phosphor. The phosphor according to the present invention is represented by the general formula (I) MyLn.sub.1 -x-(2/3)yDO.sub.4 : xR.sup.3+ (I).

Abstract: A solid-state image converting device comprises a transparent substrate, a transparent electrode formed on the transparent substrate, an EL layer, formed on the transparent electrode, emitting light by the application of an electric field, a dot-like low resistance layer formed on the EL layer, a photoconductive layer formed on the dot-like low resistance layer, and a back electrode formed on the photoconductive layer. A radiation image entered the transparent substrate or the back electrode is converted into a visible light image having high brightness on the back electrode or the transparent substrate.

Abstract: In a phosphor for a cathode-ray tube, a composition containing SiO.sub.2 and at least one element selected from the group consisting of indium, zirconium, and antimony is adhered on the surfaces of phosphor particles.

Abstract: This invention relates to rare earth tantalate and/or niobate phosphors which emit light under X-ray excitation, and an X-ray intensifing screen which utilizes these phosphors. The phosphor is represented by the general formula (I);.sup.Ln 1-x-(2/3)y-(1/3)z.sup.M" y.sup.M' z.sup.DO 4:xR.sup.3+(I)In this formula, M" is at least one kind of divalent metal selected from the group consisting of Be, Mg, Ca, Sr, Zn and Cd, M' is at least one kind of alkali metal selected from the group consisting of Li, Na, Ba and K, Ln is at least one kind of element selected from the group consisting of Y, Gd, La and Lu, D consists of Ta and/or Nb, and R is at least one selected from the group conssiting of Tm, Pr, Sm, Eu, Tb, Dy and Yb, y is a value in the range 1.times.10.sup.-5 .ltoreq.y.ltoreq.1, z is a value in range 1.times.10.sup.-4 .ltoreq.z.ltoreq.0.1, and x is a numerical value in the range 0.ltoreq..times..ltoreq.0.05.

Abstract: A phosphor for an X-ray intensifying screen contains a phosphor mixture of a phosphor represented by BaFBr:mEu.sup.2+ (5.times.10.sup.-4 .ltoreq.m.ltoreq.5.times.10.sup.-2), and a phosphor represented by Y.sub.1-2/3.times. M.sup.x TaO.sub.4 :nNb (10.sup.-5 .ltoreq..times..ltoreq.1, 0.ltoreq.n.ltoreq.0.05, and M is at least one member selected from the group consisting of Ca, Sr, and Cd). An X-ray intensifying screen includes a support and a phosphor layer formed on the support and containing the above phosphor. When this X-ray intensifying screen is used, an X-ray image producing less crossover light and having high graininess and sharpness can be obtained. An exposure amount of an object to be examined can be reduced in medical radiophotography, and radiation diagnostic performance can be improved.

Abstract: A phosphor composition and a lamp having a phosphor film formed of the composition. The composition contains red, green and blue luminescence components. The blue component emits blue light by the excitation of 253.7-nm ultraviolet light. It has a main luminescence peak wavelength of 460 to 510 nm, and a half width of the main peak of a luminescence spectrum of not less than 50 nm. The color coordinates of the luminescence spectrum of the blue component falls within a range of 0.15.ltoreq.x.ltoreq.0.30 and of 0.25.ltoreq.y.ltoreq.0.40 based on the CIE 1931 standard chromaticity diagram. The blue component has a spectral reflectance of not less 80% at 380 to 500 nm, assuming that a spectral reflectance of a smoked magnesium oxide film is 100%.

Abstract: A pigment-attached phosphor in which pigment particles are attached to the surfaces of phosphor particles by a binder, the binder being 0.01 to 1.0 parts by weight and preferably 0.05 to 0.80 parts by weight of gelatin and 0.01 to 0.5 parts by weight and preferably 0.02 to 0.40 parts by weight of urea resin, all against 100 parts by weight of phosphor, the weight ratio of the gelatin and urea resin being within a range of 1:1 to 10:1 and preferably 1:1 to 8:1. The gelatin and urea resin ensure a strong and better attachment of the pigment particles to the surfaces of the phosphor particles.

Abstract: A fluorescent lamp of this invention includes an ultraviolet reflecting layer of a nonemission material essentially consisting of .alpha.-alumina, and a light-emitting layer. The nonemission material is a white powder having an average grain size of 0.05 .mu.m to 2 .mu.m. The light-emitting layer is formed on the discharge generation region side of the ultraviolet reflecting layer. According to this invention, ultraviolet ray having passed through the light-emitting layer without being absorbed therein are reflected by the ultraviolet reflecting layer and are radiated onto the light-emitting layer again. For this reason, the light-emitting layer is more frequently excited with the ultraviolet rays to increase a luminous flux.

Abstract: A low DC voltage supplied to a low DC voltage receiving terminal is converted into a high DC voltage by a DC-DC step-up circuit. The obtained high DC voltage has an optimal value for driving an electro-luminescence device. This high DC volatage is converted into an AC voltage through a pair of series-connected transistors in a switching circuit ON/OFF-controlled in response to an oscillation output from a multivibrator. The converted voltage is supplied to the electro-luminescence device through a series resonance circuit including the electro-luminescence device and a reactor as an AC drive voltage. At this time, a resonance voltage is fed back to the multivibrator and the switching circuit so as to obtain an appropriate luminance correction capability.

Abstract: A method of producing fluorapatite wherein predetermined amounts of calcium monohydrogen phosphate, calcium carbonate, and calcium fluoride are weighed, subjected to a mechanochemical action, and caused to react with one another in water. With this method, a fluorapatite having a uniform composition can be obtained without the accompaniment of by-products. A moisture sensitive resistor of the present invention can be obtained by sintering the fluorapatite produced in accordance with this method. This moisture sensitive resistor has a sufficiently low resistance corresponding to a humidity, and has substantially no hysteresis.

Abstract: The phosphor and the X-ray intensifying screen according to the present invention emit light by the excitation of X-rays and they are used for medical and industrial radiography. In addition to the conventional contents of rare earth tantalate and/or rare earth niobate, the phosphor according to the present invention contains a determined quantity of divalent metal. This divalent metal content can make the improvement of the afterglow characteristic and the light emission characteristic of the phosphor.The phosphor according to the present invention is represented by the general formula (I)MyLn.sub.1 -X-.sub.(2/3) yDO.sub.4 : xR.sup.3+ (I).

Abstract: A light-emitting composition includes a phosphor material, and an inorganic white powder material. The inorganic powder material is doped with a dopant of Ti, Ce, Cd, Cs, Sb, K, Sc, Zr, Ge, Al, Lu, La, Gd, Tb, B and/or Si. The light-emitting composition can be applied to the inner surface of a bulb of a fluorescent lamp.

Abstract: An ultraviolet fluorescent lamp for accelerated artificial test on polymer is disclosed, which comprises a bulb consisting of an ultraviolet-ray-transmitting glass with the absorbance thereof having a wavelength of 280 nm being 1 to 3 with respect to ultraviolet rays, the inner surface of the bulb being provided with a phosphor having a characteristic that causes radiant energy transmitted through the bulb to increase by 5 to 17 times for every wavelength increase of 5 nm in a wavelength range of 295 to 310 nm, and that it has a radiant energy peak in a wavelength of 305 to 325 nm.

Abstract: A method of producing fluorapatite wherein predetermined amounts of calcium monohydrogen phosphate, calcium carbonate, and calcium fluoride are weighed, subjected to a mechanochemical action, and caused to react with one another in water. With this method, a fluorapatite having a uniform composition can be obtained without the accompaniment of by-products. A moisture sensitive resistor of the present invention can be obtained by sintering the fluorapatite produced in accordance with this method. This moisture sensitive resistor has a sufficiently low resistance corresponding to a humidity, and has substantially no hysteresis.