Abstract: A method of evaluating an organic electroluminescence element which includes at least a light emitting layer between an anode and a cathode and has a light emitting element area of not less than 100 mm2 and not more than 1 m2. The method includes the steps of: applying a direct-current voltage not less than a light emission start voltage to the organic electroluminescence element and measuring an impedance spectrum of the organic electroluminescence element; calculating a capacitance from the impedance spectrum; and determining whether a value of the capacitance is positive or negative.

Abstract: A method of evaluating an organic electroluminescence element which includes at least a light emitting layer between an anode and a cathode and has a light emitting element area of not less than 100 mm2 and not more than 1 m2. The method includes the steps of: applying a direct-current voltage not less than a light emission start voltage to the organic electroluminescence element and measuring an impedance spectrum of the organic electroluminescence element; calculating a capacitance from the impedance spectrum; and determining whether a value of the capacitance is positive or negative.

Abstract: It is found that alloys including amorphous phase comprising at least a first element selected from the group consisting of Pt and Ru, at least a second element selected from the group consisting of Zr, Hf, Si, Ir, Ru, Pd and Ni, and at least a third element selected from the group consisting of Si, Cu, Cr, Fe, Mo, Co, Al, Zr, Hf, Ni and Ru have excellent machining characteristics, heat-resistant characteristics, corrosion resistance and adhesion resistance. Using the alloys as the molding surface of a die, a heat resistant molding die for forming glass optical device having fine structure for performing high definite functions became possible to manufacture with excellent machining characteristics.

Abstract: This invention provides a light emitting diode in which a thick transparent conductive electrode is formed on an emitting side of GaN based semiconductor light emitting element, and a light emitting efficiency of the GaN semiconductor light emitting element is improved. Further, it provides a manufacturing method of the light emitting diode by which a thick transparent electrode film of the light emitting diode is effectively formed. A light emitting diode which emits light in a blue or an ultraviolet region comprising a substrate and a light emitting layer thereon comprising at least an n-type GaN based semiconductor layer, a p-type GaN based semiconductor layer, and a GaN based semiconductor sandwiched between them, wherein a transparent conductive film having a thickness of 1-100 ?m is provided on the light emitting layer.

Abstract: Employing a LED which emits light via excitation with UV light, particularly the foregoing high-power LED, disclosed are a white LED exhibiting high reliability and longer operating life, and a method of manufacturing the white LED. Also disclosed are a white light emitting diode possessing a phosphor layer which emits light via excitation with UV light, wherein the phosphor layer consists of phosphor, or possesses phosphor and transparent inorganic oxide, and a method of manufacturing the white light emitting diode, possessing the step of making phosphor particles to collide with a light emitting diode at high speed to deposit the phosphor layer, employing an aerosol deposition process.

Abstract: It is found that alloys including amorphous phase comprising at least a first element selected from the group consisting of Pt and Ru, at least a second element selected from the group consisting of Zr, Hf, Si, Ir, Ru, Pd and Ni, and at least a third element selected from the group consisting of Si, Cu, Cr, Fe, Mo, Co, Al, Zr, Hf, Ni and Ru have excellent machining characteristics, heat-resistant characteristics, corrosion resistance and adhesion resistance. Using the alloys as the molding surface of a die, a heat resistant molding die for forming glass optical device having fine structure for performing high definite functions became possible to manufacture with excellent machining characteristics.

Abstract: Disclosed is a white light emitting diode possessing a phosphor layer to convert blue light into yellow light, provided on a blue light emitting diode, wherein the phosphor layer possesses an inorganic compound containing a phosphor, and particularly a white light emitting diode, wherein this inorganic compound is a phosphor. Also disclosed is a method of manufacturing a white light emitting diode, possessing a step of forming the foregoing phosphor layer made of an inorganic compound containing a phosphor via an aerosol deposition method. A white light emitting diode exhibiting high reliability and longer operating life, which is prepared via use of a blue LED element, can be provided by what is described above.

Abstract: This invention relates to a halide-containing stimulable phosphor having improved moisture resistance and luminance, and a process for producing the same. The halide-containing stimulable phosphor is characterized in that, among elements constituting the outermost surface and inside of the phosphor, there is a difference in composition ratio of a halogen element between the outermost surface and the inside of the phosphor. A radiation image conversion panel, which has been improved, for example, in moisture resistance, luminance and image quality by using the phosphor, and a process for producing the same are also provided.

Abstract: A preparation method of a precursor of a rare earth activated alkaline earth metal fluorohalide stimulable phosphor is disclosed, comprising (A) adding an aqueous solution of an inorganic fluoride into a mother liquor containing a barium halide to form a reaction mixture containing a precipitate of a precursor of the stimulable phosphor, and (B) removing a solvent from the reaction mixture to obtain a concentrated reaction mixture, wherein the steps (A) and (B) are concurrently performed over periods of a and b, respectively, and meeting the following requirement: 0.25<a/b<0.95. A preparation method of the stimulable phosphor and a radiation image conversion panel using the stimulable phosphor are also disclosed.

Abstract: Employing a LED which emits light via excitation with UV light, particularly the foregoing high-power LED, disclosed are a white LED exhibiting high reliability and longer operating life, and a method of manufacturing the white LED. Also disclosed are a white light emitting diode possessing a phosphor layer which emits light via excitation with UV light, wherein the phosphor layer consists of phosphor, or possesses phosphor and transparent inorganic oxide, and a method of manufacturing the white light emitting diode, possessing the step of making phosphor particles to collide with a light emitting diode at high speed to deposit the phosphor layer, employing an aerosol deposition process.

Abstract: Disclosed is a white light emitting diode possessing a phosphor layer to convert blue light into yellow light, provided on a blue light emitting diode, wherein the phosphor layer possesses an inorganic compound containing a phosphor, and particularly a white light emitting diode, wherein this inorganic compound is a phosphor. Also disclosed is a method of manufacturing a white light emitting diode, possessing a step of forming the foregoing phosphor layer made of an inorganic compound containing a phosphor via an aerosol deposition method. A white light emitting diode exhibiting high reliability and longer operating life, which is prepared via use of a blue LED element, can be provided by what is described above.

Abstract: A preparation method of a precursor of a rare earth activated alkaline earth metal fluorohalide stimulable phosphor is disclosed, comprising (A) adding an aqueous solution of an inorganic fluoride into a mother liquor containing a barium halide to form a reaction mixture containing a precipitate of a precursor of the stimulable phosphor, and (B) removing a solvent from the reaction mixture to obtain a concentrated reaction mixture, wherein the steps (A) and (B) are concurrently performed over periods of a and b, respectively, and meeting the following requirement: 0.25<a/b<0.95. A preparation method of the stimulable phosphor and a radiation image conversion panel using the stimulable phosphor are also disclosed.

Abstract: Provided is a manufacturing process of a rare earth activated alkaline earth metal fluorohalide stimulable phosphor exhibiting improved productivity accompanied with an X-ray resistance property against repeating use upon X-ray exposure. Also disclosed is a liquid phase manufacturing process of a rare earth activated alkaline earth metal fluorohalide stimulable phosphor represented in following Formula (1) possessing the steps of adding an aqueous solution containing inorganic fluoride into a reaction mother liquor in which barium halide is dissolved at a reaction temperature of 85-100° C., to form a crystalline precipitate of a precursor of a rare earth activated alkaline earth metal fluorohalide stimulable phosphor, and removing a solvent from the reaction mother liquor, wherein a precursor of a stimulable phosphor is prepared via the foregoing steps conducted in parallel.

Abstract: A preparation method of an oxygen-introduced rare earth activated alkaline earth metal fluorohalide stimulable phosphor is disclosed, comprising (a) preparing a reactant solution having a barium concentration of not less than 3.3 mol/l in a reaction vessel, (b) forming a precursor of the stimulable phosphor, and (c) removing a solvent from a mother liquor.

Abstract: A preparation method of an oxygen-introduced rare earth activated alkaline earth metal fluorohalide stimulable phosphor is disclosed, comprising (a) preparing a reactant solution having a barium concentration of not less than 3.3 mol/l in a reaction vessel, (b) forming a precursor of the stimulable phosphor, and (c) removing a solvent from a mother liquor.

Abstract: A method for preparing a stimulable phosphor is disclosed, comprising forming a stimulable phosphor and coating the formed stimulable phosphor with a metal oxide and a silane coupling agent, or a metal oxide and a metal alkoxide. Another method is also disclosed, comprising forming a stimulable phosphor precursor, calcining the formed precursor in the presence of a metal oxide or metal alkoxide, and coating the calcined precursor with a silane coupling agent or metal alkoxide. Further disclosed is a preparation method of a radiation image conversion panel containing the stimulable phosphor.

Abstract: A preparation method of an oxygen-introduced stimulable phosphor including a rare earth activated alkaline earth metal fluorohalide stimulable phosphor is disclosed, comprising the steps of heating a precursor of a stimulable phosphor in an atmosphere containing oxygen, and further heating the heated precursor in a weakly reducing atmosphere. Stimulable phosphors prepared by this method and a radiation image conversion panel by use thereof are also disclosed.