公开(公告)号：US20210018160A1

公开(公告)日：2021-01-21

申请号：US16968693

申请日：2018-10-31

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Shohei TAKAKU ,  Yosuke YATSUYA ,  Yusuke KATSU ,  Tomoo TANAKA

IPC: F21V7/30 ,  F21V29/70

Abstract: Provided is an optical wavelength conversion device in which heat of an optical wavelength conversion member can be dissipated efficiently while the joint strength between the optical wavelength conversion member and a heat dissipation member is maintained. In the present disclosure, the optical wavelength conversion device includes an optical wavelength conversion member configured to convert the wavelength of incident light; a heat dissipation member which is more excellent in heat dissipation than the optical wavelength conversion member; and a joint portion which joins the optical wavelength conversion member and the heat dissipation member together. The optical wavelength conversion member includes a plate-shaped ceramic fluorescent body and a reflecting film disposed on a heat dissipation member-side surface of the ceramic fluorescent body. The joint portion has a thermal conductivity of 120 W/mK or more. The joint portion has a melting point of 240° C. or higher.

公开(公告)号：US20190245118A1

公开(公告)日：2019-08-08

申请号：US16342621

申请日：2017-10-20

Applicant: NGK SPARK PLUG CO., LTD.

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

IPC: H01L33/50 ,  C09K11/08 ,  G02B5/20

CPC classification number: H01L33/502 ,  C04B35/50 ,  C04B2235/3222 ,  C09K11/08 ,  G02B5/20 ,  H01L33/50

Abstract: An optical wavelength conversion member and a light-emitting device including the optical wavelength conversion member. The light-emitting device (1) includes a container (3), a light-emitting element (5), and an optical wavelength conversion member (9). The optical wavelength conversion member (9) is composed of a polycrystalline ceramic sintered body containing, as main components, Al2O3 crystal grains and crystal grains of a component represented by formula A3B5O12:Ce. Specifically, A and B of the A3B5O12 individually represent at least one element selected from the following element groups: A: Sc, Y, and lanthanoids (except for Ce), and B: Al and Ga; the at least one element selected from the element groups is present in each crystal grain and the crystal grain boundary of the ceramic sintered body; and the element concentration of the crystal grain boundary is higher than the element concentration of the crystal grain.