Abstract: To provide an alkaline-earth metal halogen phosphor that has high luminescent characteristics even when used with an excitation light source that emits light of the near-ultraviolet region, a phosphor-containing composition and a light emitting device using the phosphor, and a display and an illuminating device using the light emitting device, the phosphor of the present invention has a chemical composition represented by the formula (1) below and an external quantum efficiency, when excited with light of 400-nm wavelength, of 77% or higher. (Sr10-x-y-zMxEuyMnz)(PO4)6(Cl1-aQa)2??(1) (In the above formula (1), “M” represents at least one kind of element selected from the group consisting of Ba, Ca, Mg, and Zn, “Q” represents at least one kind of element selected from the group consisting of F, Br, and I, and each of “x”, “y”, “z”, and “a” represents a number satisfying the following requirements: 0?x<10, 0.3?y?1.5, 0?z?3, 0?a?1, and x+y+z?10.

Abstract: An illuminating device comprises one or more luminescent devices (1). The luminescent device comprises a semiconductor light emitting element (10) emitting a excitation light having an peak within a wavelength range from 350 nm to 430 nm, and a luminescent part (20) comprising a sealing member (22) and a phosphor (21) absorbing the light from the semiconductor light emitting element (10) and emitting a light with different emission spectrum. For the luminescent device (1), an excitation light contribution degree ?E, an index quantitatively representing what extent of a visible component of the excitation light is involved in color mixing of a combined light of the luminescent device (1), is 0.005 or less, and a mean color rendering index Ra is 70 or more.

Abstract: To provide a green phosphor with high conversion efficiency of blue of near-ultraviolet light and excellent color purity, a multinary oxynitride phosphor represented by the general formula [I] is proposed. M1xBayM2zLuOvNw??[I] In the formula [I], M1 represents Cr, Mn, Fe, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb, M2 represents Sr, Ca, Mg and Zn, L represents metal elements belonging to the fourth group or the fourteenth group of the periodic table, and x, y, z, u, v and w are the numeric values in the following ranges: 0.00001?x?3 0?y?2.99999 2.6?x+y+z?3 0<u?11 6<v?25 0<w?17.

Abstract: A phosphor (A) comprising a host material composed of a compound having a garnet crystal structure represented by the general formula (I): M1aM2bM3cOd ??(I) (wherein M1 is a divalent metal element, M2 is a trivalent metal element, M3 is a tetravalent metal element containing at least Si, a is the number of 2.7 to 3.3, b is the number of 1.8 to 2.2, c is the number of 2.7 to 3.3, and d is the number of 11.0 to 13.0), and a luminescent center ion incorporated in the host material; a light emitting device (B) comprising the phosphor as a wavelength conversion material and a semiconductor light emitting element capable of emitting a light in the range of from ultraviolet light to visible light; and a display (C) and a lighting system (D) using the light emitting device (B) as a light source. The above phosphor can be readily produced, and can provide a light emitting device having a high color rendering property.

Abstract: The invention relates to a blue composition for a color filter to realize an image having a high color purity corresponding to the emission wavelength of an improved LED backlight, a color filter and a color image display device.

Abstract: The present invention provides an alloy powder that is a material for producing inorganic functional materials such as phosphors, a phosphor with high brightness, and a method for producing the phosphor. An alloy powder for an inorganic functional material precursor contains at least one metal element and at least one activating element M1 and has a weight-average median diameter D50 of 5 ?m to 40 ?m. A method for producing a phosphor includes a step of heating an alloy, containing two or more metal elements for forming the phosphor, in a nitrogen-containing atmosphere.

Abstract: A method for producing a CASN phosphor which has an emission peak wavelength in a long wavelength range and which is prevented from being reduced in emission peak intensity, a phosphor suitable for use in displays having a NTSC ratio higher than that of conventional one, a composition containing the phosphor, a light-emitting device containing the phosphor, a display, and a lighting system. A method for producing an inorganic compound represented by the following formula from a feedstock in which the amount of Si is greater than one mole and less than 1.14 moles per mole of Al: M1aM2bAlSiX3 ??(I) where M1 represents an activation element containing at least Eu, M2 represents one or more selected from alkaline-earth metal elements, X represents one or more selected from the group consisting of O and N, and a and b each represent a positive number satisfying the inequalities 0<a?0.1 and 0.8?a+b?1.

Abstract: A phosphor (A) comprising a host material composed of a compound having a garnet crystal structure represented by the general formula (I): M1aM2bM3cOd??(I) (wherein M1 is a divalent metal element, M2 is a trivalent metal element, M3 is a tetravalent metal element containing at least Si, a is the number of 2.7 to 3.3, b is the number of 1.8 to 2.2, c is the number of 2.7 to 3.3, and d is the number of 11.0 to 13.0), and a luminescent center ion incorporated in the host material; a light emitting device (B) comprising the phosphor as a wavelength conversion material and a semiconductor light emitting element capable of emitting a light in the range of from ultraviolet light to visible light; and a display (C) and a lighting system (D) using the light emitting device (B) as a light source. The above phosphor can be readily produced, and can provide a light emitting device having a high color rendering property.

Abstract: In order to improve quantum efficiency and/or durability of phosphors, a complex oxynitride phosphor is provided represented by the following formula, which can be obtained by firing a phosphor precursor in the presence of flux. M1xBayM2zLuOvNw (In the formula, M1 represents at least one kind of activation element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb, M2 represents at least one kind of bivalent metal element selected from the group consisting of Sr, Ca, Mg and Zn, L represents a metal element selected from the metal elements belonging to the fourth group or the fourteenth group of the periodic table, and 0.00001?x?3, 0?y?2.99999, 2.6?x+y+z?3, 0<u?11, 6<v?25, and 0<w?17.

Abstract: To enhance emission efficiency and color rendering, a light emitting device 1 comprises: at least one light source 3; at least one first emitting section 4 having at least one sort of luminescent material that can emit light including a wavelength component that is longer than the light emitted from light source 3 when excited by the light emitted from light source 3; at least one second emitting section 5 having at least one sort of luminescent material that can emit light including a wavelength component that is longer than the light emitted from first emitting section 4 when excited by the light emitted from light source 3 and first emitting section 4; wherein light emitting device 1 comprises at least one light shielding unit 6 that protects at least a part of the light emitted from first emitting section 4 from entering second emitting section 5.

Abstract: To present a green- to yellow-emitting phosphor whereby a light-emitting device having high color rendering properties and high luminance can be obtained, a light-emitting device employing such a phosphor, and an image display device and a lighting system, containing such a light-emitting device. A phosphor made of a compound represented by the following formula (I), which comprises, as matrix, a compound of a garnet structure and which contains, as a luminescent center ion, a metal element in the matrix: M1aM2bXcM3dM43Oe??(I) wherein M1 is Mg and/or Zn, M2 is a bivalent metal element excluding Mg and Zn, X is a metal element as a luminescent center ion composed mainly of Ce, M3 is a trivalent metal element excluding X, M4 is a tetravalent metal element, and a, b, c, d and e are numbers satisfying the following formulae, respectively: 0.001?a?0.5 2.5?b?3.3 0.005?c?0.5 1.5?d?2.3 e={(a+b)×2+(c+d)×3+12}/2.

Abstract: The present invention relates to color image display devices having a combination of light shutters, a color filter having color elements of at least three colors of red, green and blue corresponding to the light shutters, and a backlight for transmission illumination, where the backlight has a phosphor layer or a phosphor film, and the phosphor layer or the phosphor film has a compound having at least element M4, element A, element D, element E and element X, where M4 is at least one element selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb, and includes at least Eu, A is at least one element selected from bivalent metal elements other than the element M4, D is at least one element selected from tetravalent metal elements, E is at least one element selected from trivalent metal elements, and X is at least one element selected from O, N and F.

Abstract: To provide a phosphor emitting green fluorescence and having such superior characteristics as excellent conversion efficiency of blue light or near-ultraviolet light and excellent color purity, a phosphor satisfying the following conditions (i) to (v): (i) the wavelength of emission peak thereof is 510 nm or longer and 542 nm or shorter, when excited with light of 400 nm or 455 nm (ii) the full width at half maximum of emission peak thereof is 75 nm or narrower, when excited with light of 400 nm or 455 nm, (iii) the external quantum efficiency, which is defined by the formula below, is 0.42 or larger, when excited with light of 400 nm or 455 nm, (external quantum efficiency)=(internal quantum efficiency)×(absorption efficiency) (iv) a part of its surface comprises substance containing oxygen, and (v) it contains a bivalent and trivalent metal element (MII element), and its molar ratio to the total bivalent elements is larger than 1% and smaller than 15%.

Abstract: The invention relates to a blue composition for a color filter to realize an image having a high color purity corresponding to the emission wavelength of an improved LED backlight, a color filter and a color image display device.

Abstract: To enhance emission efficiency and color rendering, a light emitting device includes: at least one light source; at least one first emitting section having at least one sort of luminescent material that can emit light including a wavelength component that is longer than the light emitted from light source when excited by the light emitted from light source; at least one second emitting section having at least one sort of luminescent material that can emit light including a wavelength component that is longer than the light emitted from first emitting section when excited by the light emitted from light source and first emitting section; wherein light emitting device includes at least one light shielding unit that protects at least a of the light emitted from first emitting section from entering second emitting section.

Abstract: To provide a semiconductor light emitting device which is capable of accomplishing a broad color reproducibility for an entire image without losing brightness of the entire image. A light source provided on a backlight for a color image display device has a semiconductor light emitting device comprising a solid light emitting device to emit light in a blue or deep blue region or in an ultraviolet region and phosphors, in combination. The phosphors comprise a green emitting phosphor and a red emitting phosphor. The green emitting phosphor and the red emitting phosphor are ones, of which the rate of change of the emission peak intensity at 100° C. to the emission intensity at 25° C., when the wavelength of the excitation light is 400 nm or 455 nm, is at most 40%.

Abstract: An object of the present invention is to make possible irradiating a desired irradiated surface with a homogenized-colored light having high color rendering, with high luminous efficiency. To achieve the object, the present invention provides a light source comprising two or more primary light sources, each of which emits primary light having different wavelength, wherein the maximum value among differences between each of CIE chromaticity coordinates of the primary lights is 0.05 or larger, the primary lights have the same illuminance distribution characteristics at a desired irradiated surface, the luminous efficiency is 30 lm/W or larger, and the general color rendering index is 60 or larger.

Abstract: To present a green- to yellow-emitting phosphor whereby a light-emitting device having high color rendering properties and high luminance can be obtained, a light-emitting device employing such a phosphor, and an image display device and a lighting system, containing such a light-emitting device. A phosphor made of a compound represented by the following formula (I), which comprises, as matrix, a compound of a garnet structure and which contains, as a luminescent center ion, a metal element in the matrix: M1aM2bXcM3dM43Oe??(I) wherein M1 is Mg and/or Zn, M2 is a bivalent metal element excluding Mg and Zn, X is a metal element as a luminescent center ion composed mainly of Ce, M3 is a trivalent metal element excluding X, M4 is a tetravalent metal element, and a, b, c, d and e are numbers satisfying the following formulae, respectively: 0.001?a?0.5 2.5?b?3.3 0.005?c?0.5 1.5?d?2.3 e={(a+b)×2+(c+d)×3+12}/2.

Abstract: The present invention provides a light-emitting device having an excitation source which emits a light having a wavelength of from 420 to 500 nm and a phosphor in combination, and having a high luminance. A light-emitting device having a first illuminant which emits a light having a wavelength of 420 to 500 nm and a second illuminant which emits a visible light when irradiated with the light from the first illuminant, characterized in that the second illuminant contains a phosphor, and the object color of the phosphor satisfies L*?90, ?22?a*??10, and b*?55, in the L*, a*, b* color system.

Abstract: To provide a phosphor that stably shows high emission intensity and brightness as well as superior temperature characteristics, under excitation by near-ultraviolet light, the phosphor contains an alkaline-earth metal aluminate and has a crystal phase comprising an alkali metal element and, in that crystal phase, the rate of substituted Eu (europium) to the number of sites which can be substituted with Eu of the crystal phase is 25% or higher and the ratio of the alkali metal element to the number of sites which can be substituted with Eu of the crystal phase is 3% or lower.