公开(公告)号：US20230183566A1

公开(公告)日：2023-06-15

申请号：US17999118

申请日：2021-05-17

Applicant: NICHIA CORPORATION

Inventor： Shigeki YOSHIDA ,  Hiroyuki WATANABE ,  Shoji HOSOKAWA

IPC: C09K11/08 ,  C09K11/77

CPC classification number: C09K11/0883 ,  C09K11/0872 ,  C09K11/0838 ,  C09K11/77347

Abstract: Provided is a phosphor having superior light-emitting properties. A phosphor composition includes: a nitride phosphor that contains, in a composition thereof, an element M that is at least one selected from the group consisting of rare earth elements except cerium, silicon, nitrogen, and cerium; and an oxyfluoride. In the phosphor composition, a content of the oxyfluoride relative to the phosphor composition is 1.5% by mass or higher and 10% by mass or lower according to an X-ray diffraction reference intensity ratio method.

公开(公告)号：US20220098483A1

公开(公告)日：2022-03-31

申请号：US17449340

申请日：2021-09-29

Applicant: NICHIA CORPORATION

Inventor： Shigeki YOSHIDA ,  Hiroyuki WATANABE ,  Eri MATSUKA

IPC: C09K11/77 ,  H01L33/50

Abstract: The wavelength converter includes a support, and a wavelength conversion layer disposed on the support. The wavelength conversion layer contains a fluorescent layer containing a fluorescent material with a composition represented by formula (1) below, and having a thickness of from 5 μm to 155 μm. A ratio of a sum of cross-sectional areas of particles of the fluorescent material in a cross-section of the wavelength conversion layer orthogonal to a disposed surface of the wavelength conversion layer that is disposed on the support and including a full width of the wavelength conversion layer to a cross-sectional area of the cross-section of the wavelength conversion layer is from 5% to 40%. In the formula (1), M1 is at least one selected from the rare earth elements other than La and Ce; a total amount of yttrium (Y), gadolinium (Gd), and lutetium (Lu) by mole with respect to a total amount of M1 by mole is 90% or more; and p, q, r, and s satisfy 2.7≤p+q+r≤3.3, 0≤r≤1.2, 10≤s≤12, and 0

公开(公告)号：US20190194540A1

公开(公告)日：2019-06-27

申请号：US16224216

申请日：2018-12-18

Applicant: NICHIA CORPORATION

Inventor： Shigeki YOSHIDA ,  Shoji HOSOKAWA

IPC: C09K11/77 ,  H01L33/50

CPC classification number: C09K11/7792 ,  H01L33/504

Abstract: Provided are an oxynitride fluorescent material, a light emitting device, and a method for producing an oxynitride fluorescent material. The oxynitride fluorescent material containing a composition represented by the following formula (I); (Ba1−aEua)1−bMbSi2O2+cN2+d (I), wherein in the formula (I), M represents at least one element selected from the group consisting of rare earth elements excluding Eu and Sm; and a, b, c, and d each satisfy 0

公开(公告)号：US20180171221A1

公开(公告)日：2018-06-21

申请号：US15842133

申请日：2017-12-14

Applicant: NICHIA CORPORATION

Inventor： Sadakazu WAKUI ,  Shigeki YOSHIDA ,  Shoji HOSOKAWA

IPC: C09K11/77 ,  C01F7/00 ,  C01F17/00 ,  C01D13/00

Abstract: Provided is a production method of a nitride fluorescent material capable of producing a nitride fluorescent material having a higher emission intensity. The production method is for producing a nitride fluorescent material having a composition containing at least one element Ma selected from the group consisting of Sr, Ca, Ba and Mg, at least one element Mb selected from the group consisting of Li, Na and K, at least one element Mc selected from the group consisting of Eu, Ce, Tb and Mn, and Al and N, which includes subjecting a raw material mixture containing elements constituting the composition of the nitride fluorescent material, along with SrF2 and/or LiF added thereto as a flux, to a heat treatment, wherein the amount of the flux is in a range of 5.0% by mass or more and 15% by mass or less relative to the total amount, 100% by mass of the raw material mixture and the flux.

公开(公告)号：US20230235223A1

公开(公告)日：2023-07-27

申请号：US18154147

申请日：2023-01-13

Applicant: NICHIA CORPORATION

Inventor： Shigeki YOSHIDA ,  Takayuki SHINOHARA ,  Hiroyuki WATANABE

IPC: C09K11/77 ,  G03B21/20

CPC classification number: C09K11/77747 ,  G03B21/204

Abstract: Provided is a fluorescent material with high brightness. The fluorescent material includes a nitride fluorescent material comprising La, Ce, Si, and N; and a first phosphorus compound disposed on a surface of the nitride fluorescent material. The first phosphorus compound includes at least one selected from the group consisting of lanthanum phosphate, lanthanum hydrogen phosphate, and hydrates thereof. A content of phosphorus atoms in the fluorescent material is 0.07% by mass or higher and 0.8% by mass or lower.

公开(公告)号：US20230295497A1

公开(公告)日：2023-09-21

申请号：US18040647

申请日：2021-08-05

Applicant: NICHIA CORPORATION

Inventor： Hiroshi OGASA ,  Shigeki YOSHIDA ,  Hiroyuki WATANABE

IPC: C09K11/77 ,  C01B21/06

CPC classification number: C09K11/77747 ,  C01B21/0602 ,  C01P2002/60 ,  C01P2002/50 ,  C01P2006/12 ,  C01P2004/61 ,  C01P2006/60 ,  C01P2004/03

Abstract: Provided is a method for producing a nitride phosphor. The method includes obtaining a first heat-treated product having a crystallite diameter of not less than 150 nm by subjecting a compound containing at least one rare-earth element selected from the group consisting of Y, La, Ce, Lu, and Gd to heat treatment at a temperature within a range of 800° C. to 1800° C.; and obtaining a second heat-treated product by subjecting a mixture containing the first heat-treated product and a raw material contained as required to heat treatment at a temperature within a range of 1200° C. to 1800° C. The raw material contains an M source containing at least one rare-earth element M selected from the group consisting of Y, Lu, and Gd; an La source; an Si source; and a Ce source. The mixture is prepared with the raw materials such that a fed composition is represented by a Formula of LawMxSi6Ny:Cez. In this Formula, w, x, y, and z satisfy 0.5≤w≤4.5, 0

公开(公告)号：US20190309221A1

公开(公告)日：2019-10-10

申请号：US16375476

申请日：2019-04-04

Applicant: NICHIA CORPORATION

Inventor： Hirofumi OOGURI ,  Tomoya FUKUI ,  Tadayoshi YANAGIHARA ,  Shigeki YOSHIDA

IPC: C09K11/02 ,  C09K11/77 ,  C09K11/08 ,  C04B35/117 ,  C04B35/593 ,  C04B35/645 ,  H01L33/50

Abstract: Provided are a method for producing a ceramic composite material that has a high light emission intensity, a ceramic composite material, and a light emitting device. The method for producing a ceramic composite material, includes: preparing a green body containing a nitride fluorescent material having a composition represented by the following chemical formula (I) and aluminum oxide particles mixed with each other; and performing primary sintering the green body at a temperature in a range of 1,250° C. or more and 1,600° C. or less to provide a first sintered body: MwLn1xAyNz  (I) wherein in the chemical formula (I), M represents at least one element selected from the group consisting of Ce and Pr; Ln1 represents at least one element selected from the group consisting of Sc, Y, La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; A represents at least one element selected from the group consisting of Si and B; and w, x, y, and z each satisfy 0