# US 10,873,010 B2 · 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 10,873,010 B2 - Document ID: US10873010B2 - Status: Granted - Kind: B2 - Application number: 16/443,635 - Filed: 2019-06-17 - Published: 2019-12-26 - Granted: 2020-12-22 - Earliest claimed: 2018-06-20 - Assignees: Stanley Electric Co., Ltd. - Applicants: Stanley Electric Co., Ltd. - Inventors: Yoichi Shimoda; Yasuhiro Ono; Yusuke Yamashita - Web page: https://patentgrep.com/patent/US10873010B2 ## CPC - H10H 20/8513: {having two or more wavelength conversion materials} - H10H 20/84: Coatings, e.g. passivation layers or antireflective coatings - H10H 20/854: characterised by their material, e.g. epoxy or silicone resins - H10H 20/8514: {characterised by their shape, e.g. plate or foil} - H10H 20/8515: {not being in contact with the bodies} - H10H 20/882: {Scattering means (H10H20/82 takes precedence)} - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract A light-emitting device includes a substrate, a light-emitting element disposed on the substrate, a light transmitting member disposed on the light-emitting element, and a covering body disposed on the substrate. The covering body covers a side surface of the light transmitting member and has an exposed upper surface. A particle group composed of a plurality of particles is dispersed in the covering body. The particle group includes a plurality of titanium oxide particles or zinc oxide particles dispersed in a vicinity of an upper surface of the covering body and each having a portion having a narrower band gap than in other portions of the particle. ## Claims ### Claim 1 A light-emitting device comprising: a substrate; a light-emitting element disposed on said substrate; a light transmitting member disposed on said light-emitting element; and a covering body that is disposed on said substrate, that covers a side surface of said light transmitting member, and that has an upper surface exposed to an outside of said light transmitting member, wherein: said covering body has a particle group composed of a plurality of particles dispersed in said covering body, said particle group includes a plurality of titanium oxide particles or zinc oxide particles dispersed in a vicinity of said upper surface of said covering body and each having a portion having a narrower band gap than in other portions of the particle, and said particle group includes first titanium oxide particles or zinc oxide particles disposed at a position closest to said upper surface and having said portion having a narrower band gap at a highest density, and second titanium oxide particles or zinc oxide particles disposed closer to said substrate than said first titanium oxide particles or zinc oxide particles and having said portion having a narrower band gap at a density lower than that of said first titanium oxide particles or zinc oxide particles. ### Claim 2 (depends on 1) The light-emitting device according to claim 1, wherein said covering body has an integrally formed resin medium in which said plurality of particles are dispersed. ### Claim 3 (depends on 1) The light-emitting device according to claim 1, wherein each of said plurality of titanium oxide particles or zinc oxide particles comprises a particle body and a coating film covering said particle body. ### Claim 4 (depends on 1) The light-emitting device according to claim 1, wherein said first titanium oxide particles or zinc oxide particles are dispersed in a region within a depth range of 20 μm or less from said upper surface of said covering body. ### Claim 5 (depends on 1) The light-emitting device according to claim 1, wherein said plurality of titanium oxide particles or zinc oxide particles are dispersed in said covering body so as to surround said side surface of said light transmitting member apart from said side surface of said light transmitting member by a predetermined distance. ### Claim 6 (depends on 5) The light-emitting device according to claim 5, wherein said predetermined distance is a distance from said side surface of said light transmitting member to a position within a region of said upper surface of said covering body from which light of 1/100 or more of a maximum intensity of light emitted from said light transmitting member is emitted. ### Claim 7 (depends on 1) The light-emitting device according to claim 1, wherein said covering body has irregularities on said upper surface. ### Claim 8 (depends on 1) The light-emitting device according to claim 1, wherein each of said plurality of titanium oxide particles or zinc oxide particles has an average particle diameter corresponding to a wavelength in said covering body of light emitted from said light emitting element. ### Claim 9 A light-emitting device comprising: a substrate; a light-emitting element disposed on said substrate; a light transmitting member disposed on said light-emitting element; and a covering body that is disposed on said substrate, that covers a side surface of said light transmitting member, and that has an upper surface exposed to an outside of said light transmitting member, wherein: said covering body has a particle group composed of a plurality of particles dispersed in said covering body, said particle group includes a plurality of titanium oxide particles or zinc oxide particles dispersed in a vicinity of said upper surface of said covering body and each having a portion having a narrower band gap than in other portions of the particle, and said plurality of particles in said particle group are dispersed in a range of 5 to 70 wt % in said covering body. ### Claim 10 (depends on 9) The light-emitting device according to claim 9, wherein said plurality of particles in said particle group are dispersed at a uniform density in said covering body. ### Claim 11 (depends on 9) The light-emitting device according to claim 9, wherein said plurality of particles in said particle group are dispersed so as to gradually increase in density from said upper surface toward said substrate in said covering body. ### Claim 12 (depends on 9) The light-emitting device according to claim 9, wherein said particle group includes said plurality of titanium oxide particles or zinc oxide particles dispersed so that a density of a portion having a narrower band gap than that in other portions in each particle is lowered from said upper surface of said covering body toward said substrate. ### Claim 13 (depends on 1, 9) The light-emitting device according to claim 9, The light-emitting device according to claim 1, wherein said covering body has an integrally formed resin medium in which said plurality of particles are dispersed. ### Claim 14 (depends on 9) The light-emitting device according to claim 9, wherein said particle group includes first titanium oxide particles or zinc oxide particles disposed at a position closest to said upper surface and having said portion having a narrower band gap at a highest density, and second titanium oxide particles or zinc oxide particles disposed closer to said substrate than said first titanium oxide particles or zinc oxide particles and having said portion having a narrower band gap at a density lower than that of said first titanium oxide particles or zinc oxide particles. ### Claim 15 (depends on 14) The light-emitting device according to claim 14, wherein said first titanium oxide particles or zinc oxide particles are dispersed in a region within a depth range of 20 μm or less from said upper surface of said covering body. ### Claim 16 (depends on 9) The light-emitting device according to claim 9, wherein each of said plurality of titanium oxide particles or zinc oxide particles comprises a particle body and a coating film covering said particle body. ### Claim 17 (depends on 9) The light-emitting device according to claim 9, wherein said plurality of titanium oxide particles or zinc oxide particles are dispersed in said covering body so as to surround said side surface of said light transmitting member apart from said side surface of said light transmitting member by a predetermined distance. ### Claim 18 A light-emitting device comprising: a substrate; a light-emitting element disposed on said substrate; and a covering body that is disposed on said substrate, that covers a side surface of said light-emitting element, and that has an upper surface exposed to an outside of said light-emitting element, wherein: said covering body has a particle group composed of a plurality of particles dispersed in said covering body, said particle group includes a plurality of titanium oxide particles or zinc oxide particles dispersed in a vicinity of said upper surface of said covering body and each having a portion having a narrower band gap than in other portions of the particle, and said particle group includes first titanium oxide particles or zinc oxide particles disposed at a position closest to said upper surface and having said portion having a narrower band gap at a highest density, and second titanium oxide particles or zinc oxide particles disposed closer to said substrate than said first titanium oxide particles or zinc oxide particles and having said portion having a narrower band gap at a density lower than that of said first titanium oxide particles or zinc oxide particles. ### Claim 19 (depends on 18) The light-emitting device according to claim 18, wherein said first titanium oxide particles or zinc oxide particles are dispersed in a region within a depth range of 20 μm or less from said upper surface of said covering body. ### Claim 20 (depends on 18) The light-emitting device according to claim 18, wherein said plurality of titanium oxide particles or zinc oxide particles are dispersed in said covering body so as to surround said side surface of said light-emitting element apart from said side surface of said light-emitting element by a predetermined distance. ### Claim 21 A light-emitting device comprising: a substrate; a light-emitting element disposed on said substrate; and a covering body that is disposed on said substrate, that covers a side surface of said light-emitting element, and that has an upper surface exposed to an outside of said light-emitting element, wherein: said covering body has a particle group composed of a plurality of particles dispersed in said covering body, said particle group includes a plurality of titanium oxide particles or zinc oxide particles dispersed in a vicinity of said upper surface of said covering body and each having a portion having a narrower band gap than in other portions of the particle, and said plurality of particles in said particle group are dispersed in a range of 5 to 70 wt % in said covering body. ### Claim 22 (depends on 21) The light-emitting device according to claim 21, wherein said plurality of particles in said particle group are dispersed at a uniform density in said covering body. ### Claim 23 (depends on 21) The light-emitting device according to claim 21, wherein said plurality of particles in said particle group are dispersed so as to gradually increase in density from said upper surface toward said substrate in said covering body.