# US 10,865,955 B1 · Wavelength conversion element and light emitting device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,955 B1 - Document ID: US10865955B1 - Status: Granted - Kind: B1 - Application number: 16/992,461 - Filed: 2020-08-13 - Published: 2020-11-26 - Granted: 2020-12-15 - Earliest claimed: 2015-10-20 - Assignees: Panasonic Semiconductor Solutions Co., Ltd. - Applicants: Panasonic Semiconductor Solutions Co., Ltd. - Inventors: Kazuhiko Yamanaka; Hideki Kasugai; Hirotaka Ueno; Kimihiro Murakami - Web page: https://patentgrep.com/patent/US10865955B1 ## CPC - F21S 41/16: Laser light sources - F21S 2/00: Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction - F21S 41/176: Light sources where the light is generated by photoluminescent material spaced from a primary light generating element - F21V 7/22: characterised by materials, surface treatments or coatings, e.g. dichroic reflectors - F21V 7/24: characterised by the material - F21V 29/502: characterised by the adaptation for cooling of specific components - H10H 20/014: {having light-emitting regions comprising only Group IV materials} - H10H 20/8512: {Wavelength conversion materials} - H10H 20/856: Reflecting means - H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls - G02B 5/021: {the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures} - G02B 5/0236: {the diffusion taking place within the volume of the element} - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A light emitting device includes a wavelength conversion element, and an excitation light source which radiates excitation light to the wavelength conversion element. The wavelength conversion element includes a support member having a supporting surface, and a wavelength conversion member disposed on the supporting surface so as to be contained within the support member when the support member is viewed from the supporting surface side. An outer peripheral region on the support member, which is an outer peripheral portion of an arrangement region including the wavelength conversion member and is exposed from the wavelength conversion member, includes a light absorbing portion which can absorb first light having same wavelength as the excitation light or a light scattering portion which can scatter the first light. The arrangement region includes a reflective member which is disposed between the wavelength conversion member and the support member, and is different from the support member. ## Claims ### Claim 1 A wavelength conversion element, comprising: a support member having a supporting surface; a reflective film disposed on the supporting surface; and a wavelength conversion member disposed on the reflective film, wherein the supporting surface includes an arrangement region where the wavelength conversion member is disposed, and an outer peripheral region disposed outside the arrangement region and exposed from the wavelength conversion member, a first scattering member is disposed on the reflective film in the outer peripheral region, and surrounds the wavelength conversion member, and a second scattering member covers a lateral surface of the wavelength conversion member. ### Claim 2 (depends on 1) The wavelength conversion element according to claim 1, wherein the support member is a crystalline substrate. ### Claim 3 (depends on 1) The wavelength conversion element according claim 1, wherein the support member contains one selected from the group consisting of silicon, silicon carbide, and diamond. ### Claim 4 (depends on 1) A light emitting device, comprising: the wavelength conversion element according to claim 1; and an excitation light source which radiates the excitation light to the wavelength conversion element. ### Claim 5 (depends on 4) The light emitting device according to claim 4, wherein the wavelength conversion element is disposed on a fixing member, and a holding member is disposed on the outer peripheral region, and is fixed to the fixing member. ### Claim 6 (depends on 4) The light emitting device according to claim 4, wherein the excitation light is radiated to the wavelength conversion member and the first scattering member. ### Claim 7 (depends on 6) The light emitting device according to claim 6, wherein in a cross-section of the supporting surface containing an optical axis of the excitation light, a sum of a width of the first scattering member and a width of the arrangement region is 2.2×2ω0 or more where ω0 represents a distance from a position where the excitation light has a maximum intensity to a position where the excitation light has an intensity equal to 1/e2 of the maximum intensity. ### Claim 8 (depends on 4) The light emitting device according to claim 4, wherein an absorption coefficient of the excitation light in the first scattering member is at least equal to an absorption coefficient of the excitation light in the arrangement region. ### Claim 9 (depends on 1) The wavelength conversion element according claim 1, wherein the reflective film includes at least one of a multi-layer dielectric film and a metal film. ### Claim 10 (depends on 1) The wavelength conversion element according claim 1, wherein the first scattering member has depressions and projections at a surface of the first scattering member. ### Claim 11 (depends on 1) The wavelength conversion element according claim 1, wherein the first scattering member has depressions and projections at an interface between the first scattering member and its surrounding air. ### Claim 12 (depends on 1) The wavelength conversion element according claim 1, further comprising: a multi-layer dielectric film disposed on a surface of the wavelength conversion member and a surface of the first scattering member. ### Claim 13 (depends on 1) The wavelength conversion element according to claim 1, wherein the first scattering member contains first particles and a transparent binder, wherein the first particles have a higher refractive index than the transparent binder, and the second scattering member contains particles which are different in average particle size from the first particles. ### Claim 14 (depends on 13) The wavelength conversion element according claim 13, wherein the first scattering member has depressions and projections at an interface between the first particles and the transparent binder. ### Claim 15 (depends on 13) The wavelength conversion element according claim 13, wherein the first particles contain at least one of TiO2, ZrO2, Al2O3, BN, and AlN, and the binder contains at least one of silicone and a glass material. ### Claim 16 (depends on 1) The wavelength conversion element according to claim 1, wherein the first scattering member contains first particles and a transparent binder, wherein the first particles have a higher refractive index than the transparent binder, and the second scattering member contains particles which are different in material from the first particles. ### Claim 17 (depends on 16) The wavelength conversion element according claim 16, wherein the first scattering member has depressions and projections at an interface between the first particles and the transparent binder. ### Claim 18 (depends on 16) The wavelength conversion element according claim 16, wherein the first particles contain at least one of TiO2, ZrO2, Al2O3, BN, and AlN, and the binder contains at least one of silicone and a glass material. ### Claim 19 A wavelength conversion element, comprising: a support member having a supporting surface; a reflective film disposed on the supporting surface; a wavelength conversion member disposed on the reflective film; and a first scattering member and a second scattering member, wherein the supporting surface includes an arrangement region where the wavelength conversion member is disposed, and an outer peripheral region disposed outside the arrangement region and exposed from the wavelength conversion member, the second scattering member covers a lateral surface of the wavelength conversion member, the second scattering member includes an inclined side surface, the inclined side surface is inclined outward and towards the support member, and the first scattering member is provided on the inclined side surface. ### Claim 20 (depends on 19) The wavelength conversion element according to claim 19, wherein the first scattering member contains first particles and a transparent binder, wherein the first particles have a higher refractive index than the transparent binder, and the second scattering member contains particles which are different in average particle size from the first particles. ### Claim 21 (depends on 20) The wavelength conversion element according claim 20, wherein the first particles contain at least one of TiO2, ZrO2, Al2O3, BN, and AlN, and the binder contains at least one of silicone and a glass material. ### Claim 22 (depends on 19) The wavelength conversion element according to claim 19, wherein the first scattering member contains first particles and a transparent binder, wherein the first particles have a higher refractive index than the transparent binder, and the second scattering member contains particles which are different in material from the first particles. ### Claim 23 (depends on 22) The wavelength conversion element according claim 22, wherein the first particles contain at least one of TiO2, ZrO2, Al2O3, BN, and AlN, and the binder contains at least one of silicone and a glass material.