Invention Grant
- Patent Title: Wavelength conversion member, production method therefor, and light emitting device
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Application No.: US16092687Application Date: 2017-04-24
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Publication No.: US10590341B2Publication Date: 2020-03-17
- Inventor: Yumi Sato , Yoshifumi Tsutai , Takashi Abe , Yutaka Sato
- Applicant: NGK SPARK PLUG CO., LTD.
- Applicant Address: JP Nagoya
- Assignee: NGK SPARK PLUG CO., LTD.
- Current Assignee: NGK SPARK PLUG CO., LTD.
- Current Assignee Address: JP Nagoya
- Agency: Stites & Harbison, PLLC
- Agent Jeffrey A. Haeberlin; James R. Hayne
- Priority: JP2016-087114 20160425
- International Application: PCT/JP2017/016240 WO 20170424
- International Announcement: WO2017/188191 WO 20171102
- Main IPC: H01L33/50
- IPC: H01L33/50 ; C09K11/77 ; H01S5/02 ; G02B5/20 ; C09K11/08 ; F21K9/64 ; F21V9/30 ; C09K11/02

Abstract:
The invention provides a wavelength conversion member and a light emitting device which each has a reduced proportion of voids and transmits less source light without causing a decrease in light conversion efficiency offered by phosphor particles having a large particle size. A wavelength conversion member 100 is configured to convert light with a specific wavelength to light with other wavelength, and includes a substrate 110 including an inorganic material, and a phosphor layer 120 joined to the substrate 110 and including phosphor particles 122 that absorb light and emit converted light and a translucent ceramic 121 that binds the phosphor particles 122 to one another. The phosphor particles 122 include two kinds of particles each having a designated particle size distribution. The two kinds of particles are larger particles having a larger average particle size and smaller particles having a smaller average particle size wherein the ratio of the average particle size of the larger particles to the average particle size of the smaller particles is 2 to 4. The ratio of the volume of the larger particles to the volume of the smaller particles is not more than 5.7.
Public/Granted literature
- US20190127636A1 WAVELENGTH CONVERSION MEMBER, PRODUCTION METHOD THEREFOR, AND LIGHT EMITTING DEVICE Public/Granted day:2019-05-02
Information query
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