9 results about "Nitride phosphor" patented technology

Provided is a nitride phosphor with which it is possible to obtain a higher luminous flux when constituting a light-emitting device. The nitride phosphor contains, in a composition, at least one group 2 element selected from the group consisting of Mg, Ca, Sr and Ba, Eu, Si, Al and N. The molar content of the Al in the composition is less than or equal to the molar content of the Sr in the composition, and the molar content of the N in the composition is less than or equal to the molar content of the Eu. The ratio of the total molar content of the group 2 element to the total molar content of Eu is 0.8 to 1.1, the ratio of the molar content of Eu is 0.002 to 0.08, the ratio of the molar content of Si is 0.8 to 1.2, and the ratio of the total molar content of Si and Al is 1.8 to 2.2. The nitride phosphor has an average aspect ratio, which is the ratio of the minor axis to the major axis, of from 0.72 to 0.77 (inclusive), and an average circularity of from 0.82 to 0.92 (inclusive).

The present invention relates to the technical field of rare earth luminescent materials and provides a red nitride phosphor, and a preparation method therefor and a use thereof. The chemical composition of the red nitride phosphor of the present invention is Sr2[Mg1-xLixAl5-xSixN7]:yEu2+, wherein 0.001≤x≤0.50 and 0.0005≤y≤0.20. The phosphor is based on a nitride system, exhibits strong light absorption of blue light at 400-500 nm, has an excitation peak value of about 460 nm, can be effectively excited by blue laser light, can emit red fluorescence under blue light excitation, has an emission peak value adjustable in the range of 635 nm to 685 nm and a full width at half maximum adjustable in the range of 75 nm to 90 nm, and greatly contributes to high color gamut in display devices. The phosphor, when used in various laser display devices using blue light high-power lasers as excitation sources, has the advantages of strong luminous brightness, high luminous efficiency, and stable physical and chemical properties.

The invention provides a light generating system (1000) comprising a first solid state light source (10) and a luminescent converter (2000), wherein: (A) the first solid state light source (10) is configured to generate first light source light (11) having a first peak wavelength (λp1) selected from the range of 380-490 nm; (B) the luminescent converter (2000) is configured in a light receiving relationship with the first solid state light source (10); wherein the luminescent converter (2000) comprises a first luminescent material (210), a second luminescent material (220), and a third luminescent material (230); (C) the first luminescent material (210) comprises a luminescent material of the type M'xM2-2xAX6:Mn4+, wherein M' comprises an alkaline earth cation, M comprises a monovalent cation, and x is in the range of 0-1, wherein A comprises a tetravalent cation, comprising one or more of silicon, titanium, and germanium, wherein X comprises a monovalent anion, at least comprising fluorine; wherein the first luminescent material (210) is configured to convert at least part of the first light source light (11) received by the first luminescent material (210) into first luminescent material light (211); (D) the second luminescent material (220) comprises one or more of a divalent europium comprising nitride luminescent material, a divalent europium comprising oxynitride luminescent material, and a luminescent material of the type M1−xLi3−2y(Al1-bGab)1+2y−zSizO4−4y−zN4y+z:Eux, wherein M comprises one or more of Mg, Ba, Sr, and Ca; wherein the second luminescent material (220) is configured to convert at least part of the first light source light (11) received by the second luminescent material (220) into second luminescent material light (221); (E) the third luminescent material (230) is configured to convert at least part of the first light source light (11) received by the third luminescent material (230) into third luminescent material light (231); wherein the third luminescent material light (231) has a third centroid wavelength (λc3) selected from the range of 500-560 nm; wherein the third luminescent material light (231) comprises at least one emission band having a third full width at half maximum FWHM3 selected from the range of 20-80 nm; and (F) the light generating system (1000) is configured to generate system light (1001), wherein the system light (1001) comprises the first luminescent material light (211), the second luminescent material light (221), and the third luminescent material light (231); wherein the system light (1001) is white light having a correlated color temperature of 2000-4000 K and a color point with a distance to the black body locus of Duv ≤ -0.01.

The present invention provides a nitride phosphor that can obtain a higher luminous flux when used in a light-emitting device. [Solution] A nitride phosphor whose composition includes at least one group 2 element selected from the group consisting of Mg, Ca, Sr, and Ba, Eu, Si, Al, and N, wherein the ratio of the total molar content of the group 2 elements and Eu to the molar content of Al in the composition is 0.8 or more and 1.1 or less, the ratio of the molar content of Eu is 0.002 or more and 0.08 or less, the ratio of the molar content of Si is 0.8 or more and 1.2 or less, and the ratio of the total molar content of Si and Al is 1.8 or more and 2.2 or less. The nitride phosphor has an average aspect ratio, which is the ratio of the minor axis to the major axis, of 0.72 or more and an average circularity of 0.82 or more and 0.92 or less.

Provided is a nitride phosphor with high emission intensity. The nitride phosphor includes: a group 1 element(s) including at least one selected from the group consisting of lithium, sodium, and potassium; a group 2 element(s) including at least one selected from the group consisting of magnesium, calcium, strontium, and barium; a group 13 element(s) including at least one selected from the group consisting of aluminum, gallium, and indium; a group 14 element(s) including at least one selected from the group consisting of silicon, germanium, and tin; nitrogen; and cerium. The nitride phosphor includes, as a host crystal, a crystal having the same crystal structure as CaAlSiN3, wherein the internal quantum efficiency upon excitation at 450 nm is not less than 87%.

To provide a production method of a nitride phosphor capable of showing high light emission intensity.SOLUTION: A production method of a nitride phosphor includes: obtaining a first heat-treated object having a crystallite diameter of 150 nm or more by heat-treating a compound containing at least one kind of rare earth element selected from the group consisting of Y, La, Ce, Lu and Gd at a temperature in a range of 800°C or more and 1,800°C or less; and obtaining a second heat-treated object by heat-treating at a temperature in a range of 1,200°C or more and 1,800°C or less, a mixture containing the first heat-treated object, and if necessary as the raw materials, an M source containing at least one kind of rare earth element M selected from the group consisting of Y, Lu and Gd, and an La source, an Si source and a Ce source, and adjusted so that a preparation composition of the raw materials is represented by composition formula LawMxSi6 Ny:Cez. In the composition formula, w, x, y and z satisfy 0.5≤w≤4.5, 0<x≤1.5, 0≤y≤12, 0<z≤1.5, 0.15<(x+z)<3.0, 3.0≤(w+x+z)≤7.5.SELECTED DRAWING: Figure 3

To provide a phosphor ceramic which emits light when excited by excitation light, and a method for producing a light-emitting device.SOLUTION: A method for producing a phosphor ceramic includes preparing a precursor that is either a molded body containing aluminum nitride or a sintered body containing aluminum nitride, and bringing the precursor into contact with a gas containing europium to obtain an aluminum nitride phosphor ceramic having a europium content in a range of more than 0.03% by mass and 1.5% by mass or less.SELECTED DRAWING: Figure 1

A nitride phosphor, having a composition that contains Eu, Si, Al, N, and a Group 2 element containing at least one selected from the group consisting of Mg, Ca, Sr, and Ba. With respect to a molar content of Al in the composition, a ratio of a total molar content of the Group 2 element and Eu is in a range of 0.8 to 1.1, a ratio of a molar content of Eu is in a range of 0.002 to 0.08, a ratio of a molar content of Si is in a range of 0.8 to 1.2, and a ratio of a total molar content of Si and Al is in a range of 1.8 to 2.2. The nitride phosphor has an average value of an aspect ratio, which is a minor-axis-to-major-axis ratio, in a range of 0.72 to 0.77, and an average circularity in a range of 0.82 to 0.92.

To provide a nitride phosphor and a light-emitting device having excellent temperature characteristics.SOLUTION: A nitride phosphor having a composition contained in composition formulas represented by the formula (1) below, has an emission peak wavelength within a range of 585 nm or more and 610 nm or less in an emission spectrum when light having an emission peak wavelength within a range of 350 nm or more and 500 nm or less is irradiated, and with an emission intensity when the irradiated exciting light is shut-off as a reference intensity, an afterglow time when the emission intensity becomes 1 / 10 of the reference intensity is 2.49 μs or more. (BavSrwEux)2Si5 N8-y (1) (wherein, v, w, x, and y each satisfy 0.50≤v≤0.919, 0.08≤w≤0.50, 0.001≤x≤0.030, 0.9<v+w+x≤1.0, 0≤y≤0.5.)SELECTED DRAWING: Figure 3