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 achieve a light-emitting device emitting light with high brightness, closer to natural light, and less color shift due to a small change in intensity of emitted light, in a light-emitting device including a light source emitting light by driving current and at least one wavelength-converting material absorbing at least part of the light from the light source and emitting light having a different wavelength, the color coordinate x1(17.5) and the color coordinate y1(17.5) of the light emitted at a driving current density of 17.5 A/cm2 and the color coordinate x1(70) and the color coordinate y1(70) of the light emitted at a driving current density of 70 A/cm2 satisfy the following Expressions (D) and (E): ?0.006?x1(17.5)?x1(70)?0.006??(D), ?0.006?y1(17.5)?y1(70)?0.006??(E).

Abstract: The present invention provides a blue (blue-green) phosphor that has sufficient emission intensity in the wavelength region around 490 nm and that has high emission luminance at a temperature region reached during LED operation. The present invention also provides a white light-emitting device that uses a high-luminance green phosphor having an emission peak wavelength of 535 nm or greater and that has improved bright blue reproducibility. A phosphor having a chemical composition of general formula [1] has sufficient emission intensity in a wavelength region around 490 nm, and a white light-emitting device that uses such a phosphor has improved bright blue reproducibility. (Sr,Ca)aBabEux(PO4)cXd??[1] (In general formula [1], X is Cl; c, d and x are numbers satisfying 2.7?c?3.3, 0.9?d?1.1 and 0.3?x?1.2; and a and b satisfy the conditions a+b=5?x and 0.12?b/(a+b)?0.4.).

Abstract: A phosphor which emits light having high brightness, serves as an excellent orange or red phosphor whose light brightness is less decreased when exposed to an excitation source contains a crystal phase having the chemical composition expressed by the general formula [1]: (1?a?b)(Ln?pMII?1-pMIII?MIV?N3).a(MIV?(3n+2)/4NnO).b(AMIV?2N3)??[1] wherein Ln? represents a metal element selected from the group consisting of lanthanoids, Mn, and Ti; MnII? represents a divalent metal element except the Ln? element; MIII? represents a trivalent metal element; MIV? represents a tetravalent metal element; A represents a metal element selected from the group consisting of Li, Na, and K; 0<p?0.2; 0?a, 0?b, a+b>0, 0?n, and 0.002?(3n+2)a/4?0.9.

Abstract: To provide a yellow to orange phosphor which has high luminance and excellent temperature characteristics and which also has high luminance when mixed with a phosphor of a different color. A phosphor containing a crystal phase represented by the following formula [I], wherein when its object color is expressed by the L*a*b* color system, the values of a*, b* and (a*2+b*2)1/2 satisfy ?20?a*??2, 71?b* and 71?(a*2+b*2)1/2, respectively: R3?x?y?z+w2MzA1.

Abstract: The present invention relates to a phosphor that satisfies requirements (1) to (3): (1) the phosphor satisfies Formula [2] and/or Formula [3]: 85?{R455(125)/R455(25)}×100?110??[2] 92?{R405(100)/R405(25)}×100?110??[3] wherein R455(125) represents an emission peak intensity when the phosphor is excited by light having a peak wavelength of 455 nm at 125° C., (2) the emission peak wavelength is in the range of 570 nm to 680 nm, and (3) the full width at half maximum of an emission peak is 90 nm or less. The phosphor of the present invention has a high luminous efficiency and emits light of orange to red with high luminance. The use of the phosphor makes it possible to produce a light-emitting device, an illumination apparatus, and an image display, having a high efficiency and excellent color rendering properties.

Abstract: To achieve a light-emitting device emitting light with high brightness, closer to natural light, and less color shift due to a small change in intensity of emitted light, in a light-emitting device including a light source emitting light by driving current and at least one wavelength-converting material absorbing at least part of the light from the light source and emitting light having a different wavelength, the color coordinate x1(17.5) and the color coordinate y1(17.5) of the light emitted at a driving current density of 17.5 A/cm2 and the color coordinate x1(70) and the color coordinate y1(70) of the light emitted at a driving current density of 70 A/cm2 satisfy the following Expressions (D) and (E): ?0.006?x1(17.5)?x1(70)?0.006??(D), ?0.006?y1(17.5)?y1(70)?0.006??(E).

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: The present invention provides a blue (blue-green) phosphor that has sufficient emission intensity in the wavelength region around 490 nm and that has high emission luminance at a temperature region reached during LED operation. The present invention also provides a white light-emitting device that uses a high-luminance green phosphor having an emission peak wavelength of 535 nm or greater and that has improved bright blue reproducibility. A phosphor having a chemical composition of general formula [1] has sufficient emission intensity in a wavelength region around 490 nm, and a white light-emitting device that uses such a phosphor has improved bright blue reproducibility. (Sr,Ca)aBabEux(PO4)cXd??[1] (In general formula [1], X is Cl; c, d and x are numbers satisfying 2.7?c?3.3, 0.9?d?1.1 and 0.3?x?1.2; and a and b satisfy the conditions a+b=5?x and 0.05?b/(a+b)?0.6.

Abstract: To achieve a light-emitting device emitting light with high brightness, closer to natural light, and less color shift due to a small change in intensity of emitted light, in a light-emitting device including a light source emitting light by driving current and at least one wavelength-converting material absorbing at least part of the light from the light source and emitting light having a different wavelength, the color coordinate x1(17.5) and the color coordinate y1(17.5) of the light emitted at a driving current density of 17.5 A/cm2 and the color coordinate x1(70) and the color coordinate y1(70) of the light emitted at a driving current density of 70 A/cm2 satisfy the following Expressions (D) and (E): ?0.006?x1(17.5)?x1(70)?0.006??(D), ?0.006?y1(17.5)?y1(70)?0.006??(E).

Abstract: A method for industrially producing a phosphor with high performance, in particular, high brightness. Also disclosed is a nitrogen-containing alloy and an alloy powder useful for producing the high performance phosphor. The method for producing the phosphor includes heating a raw material for a phosphor in whole or in part comprising an alloy containing two or more different metal elements under a nitrogen-containing atmosphere and heating the raw material for a phosphor under conditions such that the temperature change per minute is 50° C. or lower. Using an alloy as all or part of the raw material constituting the phosphor precursor, it is possible to suppress the rapid progression of nitridation during heat treatment and industrially produce a phosphor with high performance, in particular, high brightness.

Abstract: A phosphor which emits light having high brightness, serves as an excellent orange or red phosphor whose light brightness is less decreased when exposed to an excitation source contains a crystal phase having the chemical composition expressed by the general formula [1]: (1?a?b)(Ln?pMII?1?pMIII?MIV?N3).a(MIV?(3n+2)/4NnO).b(AMIV?2N3)??[1] wherein Ln? represents a metal element selected from the group consisting of lanthanoids, Mn, and Ti; MnII? represents a divalent metal element except the Ln? element; MIII? represents a trivalent metal element; MIV? represents a tetravalent metal element; A represents a metal element selected from the group consisting of Li, Na, and K; 0<p?0.2; 0?a, 0?b, a+b>0, 0?n, and 0.002?(3n+2)a/4?0.9.

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: There is provided a method for industrially producing a phosphor with high performance, in particular, high brightness. There is also provided a nitrogen-containing alloy and an alloy powder that can be used for the production method. A method for producing a phosphor includes a step of heating a raw material for the phosphor under a nitrogen-containing atmosphere, in which an alloy containing two or more different metal elements constituting the phosphor is used as the whole or part of the raw material for the phosphor, and in the heating step, the heating is performed under conditions such that the temperature change per minute is 50° C. or lower. It is possible to suppress the rapid progress of a nitridation reaction in heat treatment in producing the phosphor using an alloy for a phosphor precursor as the whole or part of the raw material, thereby industrially producing the phosphor with high performance, in particular, high brightness.

Abstract: The present invention relates to a phosphor represented by the following general formula (I), comprising: a composite oxide containing a divalent and trivalent metal elements as a host crystal; and at least Ce as an activator element in said host crystal, wherein the phosphor has a maximum emission peak in a wavelength range of from 485 nm to 555 nm in the emission spectrum at room temperature: M1aM2bM3cOd??(I) wherein M1 represents an activator element containing at least Ce; M2 represents a divalent metal element; M3 represents a trivalent metal element; a is a number within a range of 0.0001?a?0.2; b is a number within a range of 0.8?b?1.2; c is a number within a range of 1.6?c?2.4; and d is a number within a range of 3.2?d?4.8. Further, a light emitting device comprising said phosphor and a display and a lighting system having said light emitting device as a light source are disclosed.

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: 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 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 provide a phosphor having nearly spherical shapes, the phosphor has an elemental ratio represented by the formula below, and contains at least two kinds of Li, Na, K, Rb, Cs, P, Cl, F, Br, I, Zn, Ga, Ge, In, Sn, Ag, Au, Pb, Cd, Bi and Ti. M1aM2bM3cOd (M1 represents Cr, Mn, Fe, Co, Ni, Cu, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm or Yb, M2 mainly represents a bivalent metal element, M3 mainly represents a trivalent metal element, and a, b, c and d are 0.0001?a?0.2, 0.8?b?1.2, 1.6?c?2.4 and 3.2?d?4.8, respectively.

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.