公开(公告)号：US20190127636A1

公开(公告)日：2019-05-02

申请号：US16092687

申请日：2017-04-24

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yumi SATO ,  Yoshifumi TSUTAI ,  Takashi ABE ,  Yutaka SATO

IPC: C09K11/77 ,  C09K11/02 ,  F21V9/30 ,  F21K9/64

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.

公开(公告)号：US20190024879A1

公开(公告)日：2019-01-24

申请号：US16070974

申请日：2017-01-13

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yumi SATO ,  Yoshifumi TSUTAI ,  Takashi ABE ,  Yutaka SATO

IPC: F21V29/10 ,  F21V7/30 ,  F21V9/35 ,  C09K11/02 ,  C09K11/77

Abstract: The invention provides a fluorescent member which has high thermal conductivity and thus can prevent an increase in temperature of a phosphor layer and can maintain fluorescent performance even when irradiated with source light having a high intensity, and provides a light-emitting device having such a member. A reflection-type wavelength converting member 100 converts light with a specific wavelength to light with other wavelength and also reflects the light on a reflection surface to emit the light as illumination light. The wavelength converting member 100 includes a substrate 110 including an inorganic material, and a phosphor layer 120 disposed on 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 ratio of the thickness of the phosphor layer 120 to the average particle size of the phosphor particles 122 is less than 30. The reflection surface on which the converted light is reflected is a surface of the substrate 110 or a surface of a reflector adjacent to the wavelength converting member.

公开(公告)号：US20190316034A1

公开(公告)日：2019-10-17

申请号：US16463652

申请日：2017-12-04

Applicant: NGK Spark Plug Co., Ltd.

Inventor： Toshimitsu KIKUCHI ,  Yoshifumi TSUTAI ,  Takashi ABE ,  Ai HAYASAKA

IPC: C09K11/02 ,  C09K11/64

Abstract: A wavelength conversion member is provided which includes a phosphor layer having an increased pencil hardness and thereby has a reduced risk of breakage such as scattering of fragments of the phosphor layer or separation of the phosphor layer.A substrate 12 is made of sapphire, and a phosphor layer 14 is disposed on the substrate 12 and includes phosphor particles 16 and a light transmissive inorganic material 22. The phosphor layer 14 has a pencil hardness of 5B or above. The high hardness of the phosphor layer 14 reduces the risk of breakage such as the phosphor layer 14 being scattered as fragments or being separated from the substrate 12.

公开(公告)号：US20190273190A1

公开(公告)日：2019-09-05

申请号：US16066086

申请日：2017-01-13

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yoshifumi TSUTAI ,  Yumi SATO ,  Takashi ABE ,  Yutaka SATO

IPC: H01L33/50 ,  H01L33/60 ,  C09K11/08 ,  C09K11/02 ,  F21K9/64 ,  F21V9/30

Abstract: Provided are a fluorescent member that has high thermal conductivity, can prevent an increase in temperature of a fluorescent layer, and can maintain their fluorescence performance even during irradiation with high-intensity source light, and a light-emitting device using the fluorescent member. A transmissive-type wavelength conversion member 100 converts light with a wavelength in a specific range to light with a different wavelength and allows light passing through the wavelength conversion member to be used as illuminating light. The wavelength conversion member 100 includes: a substrate 110 that is formed of an inorganic material and allows light to pass through; and a fluorescent material layer 120 disposed on the substrate 110. The fluorescent material layer 120 includes fluorescent material particles 122 that absorb light and emit converted light and a light-transmitting ceramic 121 that bonds the fluorescent material particles 122 together. The ratio of the thickness of the fluorescent material layer 120 to the average particle diameter of the fluorescent material particles 122 is less than 30.

公开(公告)号：US20190093871A1

公开(公告)日：2019-03-28

申请号：US16088566

申请日：2017-02-03

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Yumi SATO ,  Yoshifumi TSUTAI ,  Takashi ABE ,  Yutaka SATO

IPC: F21V29/70 ,  C09K11/77 ,  F21V9/32 ,  F21V13/08 ,  F21K9/64

Abstract: The invention provides a wavelength conversion member which can draw heat efficiently away from a region that is prone to generating heat under irradiation of light with a high energy density and which can suppress the thermal quenching of phosphor, and provides a method for manufacturing such wavelength conversion members, and a light-emitting device having such a wavelength conversion member.A wavelength conversion member 100 of reflection type is configured to convert light with a specific wavelength to light with other wavelength and also configured to reflect the light on a reflection surface, thereby emitting the light as illumination light, wherein the wavelength conversion member 100 includes a transmissive element 110 including an inorganic material and being optically transmissive, a phosphor layer 120 joined to the transmissive element 110 and including phosphor particles that absorb light and emit converted light and a translucent ceramic that binds the phosphor particles to one another, and a reflector 130 disposed in contact with a side of the phosphor layer 120 opposite to the transmissive element 110 and defining the reflection surface on which the converted light is reflected. With this configuration, heat can be dissipated efficiently from a region that is prone to generating heat under irradiation of light with a high energy density, and the thermal quenching of phosphor can be suppressed.