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    PHOSPHOR POWDER, COMPOSITE, AND LIGHT-EMITTING DEVICE
    4.
    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.

    PHOSPHOR AND LIGHT-EMITTING DEVICE
    5.
    发明申请
    PHOSPHOR AND LIGHT-EMITTING DEVICE 有权

    公开(公告)号：US20210324267A1

    公开(公告)日：2021-10-21

    申请号：US17272878

    申请日：2019-08-22

    Applicant: DENKA COMPANY LIMITED

    Inventor： Kazuya SUGITA ,  Yusuke TAKEDA ,  Keita KOBAYASHI ,  Akihisa KAJIYAMA

    IPC: C09K11/77 ,  H01L33/50

    Abstract: A phosphor which has a main crystal phase having the same crystal structure as that of CaAlSiN3, wherein the phosphor satisfies conditions of a span value (d90−d10)/d50 of 1.70 or less and a d50 of 10.0 μm or less, as represented with d10, d50, and d90 on a volume frequency measured according to a laser diffraction method; wherein the d10, d50, and d90 on a volume frequency in a particle distribution measured are each a measured by loading 0.5 g of a phosphor into 100 ml of a solution of 0.05% by weight of sodium hexametaphosphate mixed in ion exchange water, and subjecting the resultant to a dispersing treatment for 3 minutes with an ultrasonic homogenizer at an oscillation frequency of 19.5±1 kHz, a chip size of 20φ, and an amplitude of vibration of 32±2 μm, with a chip placed at a central portion.

    RED PHOSPHOR AND LIGHT EMISSION DEVICE
    9.
    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.

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