公开(公告)号：US20190198726A1

公开(公告)日：2019-06-27

申请号：US16328161

申请日：2017-10-18

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Jun MOTEKI ,  Shohei TAKAKU ,  Yusuke KATSU ,  Takeshi MITSUOKA ,  Tsuneyuki ITO

IPC: H01L33/50 ,  H01L33/16 ,  C04B35/44 ,  C04B35/115 ,  C04B35/117 ,  C09K11/77

Abstract: An optical wavelength conversion member including a polycrystalline ceramic sintered body containing, as main components, Al2O3 crystal grains and crystal grains of a component represented by formula A3B5O12:Ce, wherein A is at least one element selected from Sc, Y and lanthanoids (except for Ce), and B is at least one element selected from Al and Ga. Further, the following relations are satisfied: 0%≤X≤25%, 9%≤Y≤45%, and 48%≤Z≤90%, wherein X represents a proportion corresponding to the ratio a/N, Y represents a proportion corresponding to the ratio b/N, and Z represents a proportion corresponding to the ratio c/N and a, b, c and N are as defined herein. Also disclosed is a light-emitting device including the optical wavelength conversion member.

公开(公告)号：US20210324266A1

公开(公告)日：2021-10-21

申请号：US16973367

申请日：2019-07-17

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Shohei TAKAKU ,  Yusuke KATSU ,  Tsuneyuki ITO ,  Toshiaki KURAHASHI ,  Hideto YAMADA

IPC: C09K11/77 ,  H01L33/50 ,  C09K11/02 ,  C04B35/10

Abstract: In one aspect of the present disclosure, there is provided an optical wavelength conversion member including a polycrystalline ceramic sintered body containing, as main components, Al2O3 crystal grains and crystal grains represented by formula X3Al5O12:Ce. In the optical wavelength conversion member 9, atoms of element X are present also in an Al2O3 crystal grain adjacent to the interface between the Al2O3 crystal grain and an X3Al5O12:Ce crystal grain.

公开(公告)号：US20190259918A1

公开(公告)日：2019-08-22

申请号：US16342390

申请日：2017-10-20

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Shohei TAKAKU ,  Yusuke KATSU ,  Tsuneyuki ITO ,  Yuki SHIMURA ,  Takeshi MITSUOKA ,  Jun MOTEKI

IPC: H01L33/50 ,  C04B35/50

Abstract: An optical wavelength conversion member and a light-emitting device including the optical wavelength conversion member. The optical wavelength conversion member (9) is formed of a ceramic sintered body having a fluorescent phase containing fluorescent crystal grains as a main component and a translucent phase containing translucent crystal grains as a main component. Crystal grains of the fluorescent phase have a composition represented by formula A3B5O12:Ce, where the element A is selected from Sc, Y, and lanthanoids (except for Ce), and the element B is selected from Al and Ga. In the optical wavelength conversion member (9), 0.3

公开(公告)号：US20210098657A1

公开(公告)日：2021-04-01

申请号：US17058340

申请日：2019-05-10

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Tsuneyuki ITO ,  Shohei TAKAKU ,  Yuki SHIMURA ,  Shinji BAN ,  Yusuke KATSU

IPC: H01L33/50 ,  C04B35/80 ,  C04B35/115 ,  H01L33/64

Abstract: An optical wavelength conversion member according to one aspect of the present disclosure includes a ceramic sintered body, wherein the ceramic sintered body has a fluorescent phase containing, as a main. component, fluorescent crystal grains that generate fluorescence in response to incident light, and a translucent phase containing translucent crystal grains as a main component. The optical wavelength conversion member includes a metal layer having light reflectivity and provided on a side of the ceramic sintered body opposite the side on which the light is incident, and a dielectric multilayer film including dielectric layers having different optical refractive indices and provided between the ceramic sintered body and the metal layer.

公开(公告)号：US20190245119A1

公开(公告)日：2019-08-08

申请号：US16343188

申请日：2017-10-24

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yusuke KATSU ,  Shohei TAKAKU ,  Tsuneyuki ITO ,  Takeshi MITSUOKA ,  Jun MOTEKI

IPC: H01L33/50 ,  H01L33/48 ,  B32B7/027 ,  B32B15/04 ,  C09K11/77 ,  C09K11/02 ,  C04B35/117 ,  C04B35/44 ,  C04B35/645

CPC classification number: H01L33/502 ,  B32B7/027 ,  B32B15/04 ,  B32B2307/302 ,  C04B35/117 ,  C04B35/44 ,  C04B35/50 ,  C04B35/645 ,  C04B2235/3217 ,  C04B2235/3222 ,  C04B2235/6585 ,  C09K11/02 ,  C09K11/08 ,  C09K11/7774 ,  G02B5/20 ,  H01L33/483 ,  H01L33/50 ,  H01L33/505 ,  H01L2933/0041

Abstract: A method for producing an optical wavelength conversion member (9) composed of a sintered body containing, as main components, Al2O3 and a component represented by formula A3B5O12:Ce; an optical wavelength conversion member; an optical wavelength conversion component including the optical wavelength conversion member; and a light-emitting device including the optical wavelength conversion member or the optical wavelength conversion component. The production method of the sintered body includes firing in a firing atmosphere having a pressure of 104 Pa or more and an oxygen concentration of 0.8 vol. % or more and less than 25 vol. %.

公开(公告)号：US20230213172A1

公开(公告)日：2023-07-06

申请号：US18000864

申请日：2021-06-03

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Shohei TAKAKU ,  Hiroki YAMAUCHI ,  Shinji BAN ,  Hiroki TAKEUCHI

IPC: F21V9/40 ,  F21V7/26 ,  F21V29/502 ,  F21V29/70

CPC classification number: F21V9/40 ,  F21V7/26 ,  F21V29/502 ,  F21V29/70

Abstract: A fluorescent plate includes a fluorescent phase which emits fluorescence by excitation light, a light-transmitting phase which allows passage of the excitation light, and a plurality of voids surrounded by the fluorescent phase and the light-transmitting phase, wherein, in a cross section of the fluorescent plate including cross sections of the voids, an average ratio of a portion of the circumference of a void, which portion is in contact with the fluorescent phase to the entire circumference of the void, is higher than an area ratio of the area of the fluorescent phase present in the fluorescent plate to the total area of the fluorescent phase and the light-transmitting phase present in the fluorescent plate.

公开(公告)号：US20230213171A1

公开(公告)日：2023-07-06

申请号：US18000973

申请日：2021-06-03

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Hiroki YAMAUCHI ,  Shohei TAKAKU ,  Shinji BAN ,  Hiroki TAKEUCHI

IPC: F21V9/30 ,  F21V7/26 ,  F21V29/502 ,  F21V29/70

CPC classification number: F21V9/30 ,  F21V7/26 ,  F21V29/502 ,  F21V29/70

Abstract: A fluorescent plate includes a fluorescent phase which emits fluorescence by excitation light, and a plurality of voids. The plurality of voids include a plurality of particular voids having an equivalent circle diameter of 0.4 micrometers or greater and 50 micrometers or smaller. In a cross section of the fluorescent plate, the ratio of the number of the particular voids having a circularity greater than 0.6 and 1 or less to the total number of the plurality of particular voids is 50% or greater.

公开(公告)号：US20210246367A1

公开(公告)日：2021-08-12

申请号：US16973322

申请日：2019-07-01

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Shohei TAKAKU ,  Yusuke KATSU ,  Tsuneyuki ITO ,  Toshiaki KURAHASHI ,  Hideto YAMADA

IPC: C09K11/02 ,  F21V9/30 ,  C09K11/77 ,  C04B35/117

Abstract: One aspect of the disclosure provides an optical wavelength conversion member including a polycrystalline ceramic sintered body containing, as main components, Al2O3 crystal grains and crystal grains represented by formula (Y,A)3B5O12:Ce. In the optical wavelength conversion member, a (Y,A)3B5O12:Ce crystal grain has a region wherein the A concentration of a peripheral portion of the (Y,A)3B5O12:Ce crystal grain is higher than that of an interior portion of the (Y,A)3B5O12:Ce crystal grain. Thus, the optical wavelength conversion member exhibits high fluorescence intensity (i.e., high emission intensity) and high heat resistance (i.e., low likelihood of temperature quenching). The optical wavelength conversion member has a structure wherein the element A concentration of a peripheral portion of a (Y,A)3B5O12:Ce crystal grain differs from that in an interior portion of the crystal grain. This structure can achieve a ceramic fluorescent body exhibiting superior fluorescent characteristics and superior thermal characteristics with varied colors of emitted light.

公开(公告)号：US20230383926A1

公开(公告)日：2023-11-30

申请号：US18245275

申请日：2021-12-13

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yosuke YATSUYA ,  Toshiyuki SAKURAI ,  Shohei TAKAKU ,  Hiroki YAMAUCHI ,  Tomoo TANAKA ,  Hiroki TAKEUCHI ,  Shinji BAN

IPC: F21V7/30 ,  F21V9/30 ,  F21K9/64

CPC classification number: F21V7/30 ,  F21V9/30 ,  F21K9/64

Abstract: There is provided a wavelength conversion member including: a fluorescent body and a reflective film. The fluorescent body is configured to emit fluorescence by an excitation light and has an incident surface into which the excitation light comes and a rear surface which faces the incident surface. The reflective film is arranged on a side of the rear surface of the fluorescent body and includes a metal layer and ceramic particles dispersed in the metal layer. The ceramic particles are crystalline, and a melting point of the ceramic particles is higher than a melting point of a metal constructing the metal layer.

公开(公告)号：US20230220977A1

公开(公告)日：2023-07-13

申请号：US18000953

申请日：2021-06-03

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Shohei TAKAKU ,  Hiroki YAMAUCHI ,  Shinji BAN ,  Hiroki TAKEUCHI

IPC: F21V13/08 ,  F21V9/40 ,  F21V29/83 ,  F21V3/08 ,  F21V7/05

CPC classification number: F21V13/08 ,  F21V9/40 ,  F21V29/83 ,  F21V3/08 ,  F21V7/05 ,  F21Y2115/30

Abstract: A fluorescent plate including a fluorescent phase which emits fluorescence by excitation light, and a plurality of voids, wherein, in a cross section of the fluorescent plate including cross sections of the voids, voids having an equivalent circle diameter of 0.4 micrometers or greater and 50 micrometers or smaller have a standard deviation in equivalent circle diameter of 1.5 or less.