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    RED PHOSPHOR AND LIGHT EMISSION DEVICE
    2.
    发明申请
    RED PHOSPHOR AND LIGHT EMISSION DEVICE 审中-公开

    公开(公告)号：US20200251619A1

    公开(公告)日：2020-08-06

    申请号：US16755450

    申请日：2018-10-02

    Applicant: DENKA COMPANY LIMITED

    Inventor： Tomohiro NOMIYAMA ,  Marina TAKAMURA ,  Yusuke TAKEDA ,  Shintaro WATANABE

    IPC: H01L33/50

    Abstract: The purpose of the invention is to both improve the luminance of a SCASN-based phosphor and achieve deep-color rendering properties. Provided is a red phosphor having a main crystal phase having the same crystal structure as a crystal structure of CaAlSiN3, the main crystal phase represented by the general formula MAlSiN3, wherein an internal quantum efficiency, as measured when the red phosphor is excited by light having a wavelength of 455 nm, is 71% or more, and M in the general formula represents an element group containing at least three elements selected from Eu, Sr, Mg, Ca, and Ba, the element group containing Eu, Sr, and Ca as essentials, and a Eu content is 4.5 mass % or more and 7.0 mass % or less, a Sr content is 34.0 mass % or more and 42.0 mass % or less, and a Ca content is 0.8 mass % or more and 3.0 mass % or less.

    PHOSPHOR POWDER AND LIGHT-EMITTING DEVICE
    3.
    发明申请
    PHOSPHOR POWDER AND LIGHT-EMITTING DEVICE 有权

    公开(公告)号：US20220204842A1

    公开(公告)日：2022-06-30

    申请号：US17605079

    申请日：2020-04-15

    Applicant: DENKA COMPANY LIMITED

    Inventor： Manabu KOBAYASHI ,  Tomohiro NOMIYAMA

    IPC: C09K11/77 ,  H01L33/26 ,  H01L33/50 ,  C01F17/30 ,  C09K11/61

    Abstract: A phosphor powder contains an EU-activated β-type sialon phosphor particles. When a median diameter in the phosphor powder having not been subjected to an ultrasonic homogenizer treatment is set as D1 and a median diameter in the phosphor powder having been subjected to an ultrasonic homogenizer treatment is set as D2, 1.05≤D1/D2≤1.70. A dispersion liquid in which 30 mg of the phosphor powder is uniformly dispersed in 100 ml of a 0.2% concentration of a sodium hexametaphosphate aqueous solution is added to a columnar container of which a bottom surface has an inner diameter of 5.5 cm. Then, the dispersion liquid is irradiated with ultrasonic waves for 3 minutes at a frequency of 19.5 kHz, and an output of 150 W, in a state where a cylindrical tip, which has an outer diameter of 20 mm, of an ultrasonic homogenizer is immersed in the dispersion liquid in ≥1.0 cm.

    PHOSPHOR POWDER, COMPOSITE, AND LIGHT-EMITTING DEVICE
    8.
    发明申请
    PHOSPHOR POWDER, COMPOSITE, AND LIGHT-EMITTING DEVICE 有权

    公开(公告)号：US20220145176A1

    公开(公告)日：2022-05-12

    申请号：US17598520

    申请日：2020-03-24

    Applicant: DENKA COMPANY LIMITED

    Inventor： Tomohiro NOMIYAMA ,  Yusuke TAKEDA ,  Tatsuya OKUZONO ,  Masaru MIYAZAKI ,  Shintaro WATANABE

    IPC: C09K11/77 ,  H01L33/50 ,  C01F17/34

    Abstract: A phosphor powder composed of α-sialon phosphor particles containing Eu. The phosphor powder has an ammonium ion concentration CA of the phosphor powder of equal to or more than 15 ppm and equal to or less than 100 ppm, which is determined from the following extracted ion analysis. (Extracted Ion Analysis A) 0.5 g of a phosphor powder is added to 25 ml of distilled water in a polytetrafluoroethylene (PTFE)-made container with a lid and held at 60° C. for 24 hours, and then a total mass MA of ammonium ions included in an aqueous solution obtained by removing a solid content from the solution by filtration is determined using ion chromatography. Then, CA is determined by dividing MA by the mass of the phosphor powder.

    B-SIALON PHOSPHOR AND LIGHT EMITTING DEVICE
    9.
    发明申请
    B-SIALON PHOSPHOR AND LIGHT EMITTING DEVICE 有权

    公开(公告)号：US20220010205A1

    公开(公告)日：2022-01-13

    申请号：US17294721

    申请日：2019-11-07

    Applicant: DENKA COMPANY LIMITED

    Inventor： Manabu KOBAYASHI ,  Keita KOBAYASHI ,  Tomohiro NOMIYAMA ,  Shintaro WATANABE

    IPC: C09K11/77 ,  H01L33/50

    Abstract: A β-sialon phosphor that is a solid solution of europium, in which D50 is 7.0 μm or more and 20.0 μm or less and (D50−D10)/D50 is 0.60 or less, where D50 is a 50% area diameter of primary particles of the β-sialon phosphor, and D10 is a 10% area diameter of the primary particles of the β-sialon phosphor. Primary particles are defined as single-crystal particles distinguished for each crystal orientation by identifying the crystal orientation of individual particles of the β-sialon phosphor by an electron backscatter diffraction image method. D50 and D10 are obtained by image analysis of the cross-sectional area of the primary particles.

    PHOSPHOR PLATE AND LIGHT EMITTING DEVICE
    10.
    发明申请
    PHOSPHOR PLATE AND LIGHT EMITTING DEVICE 有权

    公开(公告)号：US20230113551A1

    公开(公告)日：2023-04-13

    申请号：US17909659

    申请日：2021-02-01

    Applicant: DENKA COMPANY LIMITED

    Inventor： Kazuya SUGITA ,  Taiyo YAMAURA ,  Tomohiro NOMIYAMA

    IPC: H01L33/50 ,  C09K11/08

    Abstract: A phosphor plate includes a plate-like composite including an inorganic base material, which is a sintered material of two or more types of metal oxide including SiO2, and a phosphor contained in the inorganic base material, in which the phosphor includes an α-type sialon phosphor, and in a case in which intensity of transmitted light at a wavelength of 455 nm and intensity of reflected light at a wavelength of 455 nm of the phosphor plate are denoted by T1 and R1, respectively, T1 and R1 satisfy 1.5×10−2≤T1/R1≤5.0×10−2.

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