# US 2026/0076015 A1 · Substrate 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 2026/0076015 A1 - Document ID: US20260076015A1 - Status: Published application - Kind: A1 - Application number: 19/322,707 - Filed: 2025-09-09 - Published: 2026-03-12 - Earliest claimed: 2024-09-11 - Assignees: Nichia Corporation - Applicants: Nichia Corporation - Inventors: Eiko MINATO - Web page: https://patentgrep.com/patent/US20260076015A1 ## CPC - H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls - H10H 29/857: {Interconnections (of active-matrix LED displays H10H29/49)} - H10H 29/24: comprising multiple light-emitting semiconductor devices - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract A substrate including a base including a primary surface, a conductive member disposed on the primary surface. and a covering member. The conductive member includes a first portion including a first conductive layer and an aluminum layer layered in order from a bottom of the conductive member, a second portion including a gold layer on an uppermost surface of the second portion of the conductive member, and a third portion including the gold layer, the first conductive layer, and the aluminum layer layered in order from the bottom of the conductive member. The covering member covers a first boundary, which is a boundary between the first portion and the third portion, and a second boundary, which is a boundary between the second portion and the third portion. ## Claims ### Claim 1 A substrate comprising: a base including a primary surface; a conductive member disposed on the primary surface; and a covering member, wherein the conductive member comprises: a first portion including a first conductive layer and an aluminum layer layered in order from a bottom of the conductive member; a second portion including a gold layer on an uppermost surface of the second portion of the conductive member; and a third portion including the gold layer, the first conductive layer, and the aluminum layer layered in order from the bottom of the conductive member, and wherein the covering member covers a first boundary, which is a boundary between the first portion and the third portion, and a second boundary, which is a boundary between the second portion and the third portion. ### Claim 2 (depends on 1) The substrate according to claim 1, wherein an ionization tendency of the first conductive layer is lower than an ionization tendency of the aluminum layer. ### Claim 3 (depends on 1) The substrate according to claim 1, wherein the base includes a nitride ceramic, wherein the conductive member includes a second conductive layer between the gold layer and the base, and wherein the second conductive layer includes a first layer comprising nickel and chromium. ### Claim 4 (depends on 3) The substrate according to claim 3, wherein the first conductive layer comprises at least one of titanium or ruthenium, and wherein a gap is arranged between the first conductive layer and the first layer. ### Claim 5 (depends on 4) The substrate according to claim 4, wherein an end portion of the first layer is positioned in the third portion. ### Claim 6 (depends on 3) The substrate according to claim 3, wherein an end portion of the first layer is positioned in the first portion. ### Claim 7 (depends on 3) The substrate according to claim 3, wherein a thickness of the first conductive layer is smaller than a thickness of the second conductive layer. ### Claim 8 (depends on 1) The substrate according to claim 1, wherein the base comprises a nitride ceramic, wherein the first conductive layer comprises at least one of titanium or ruthenium, and wherein the first conductive layer and the base are in contact with each other. ### Claim 9 (depends on 1) The substrate according to claim 1, wherein a thickness of the third portion is greater than a thickness at an outer edge of the first portion and a thickness of the second portion. ### Claim 10 (depends on 1) The substrate according to claim 1, wherein, in top view, an area of the third portion is smaller than an area of the first portion. ### Claim 11 (depends on 1) The substrate according to claim 1, wherein the primary surface of the base comprises: a first region in which the covering member is disposed; and a second region exposed from the covering member, and wherein a distance between the first boundary and a third boundary, which is a boundary between the first region and the second region, is 10 μm or more. ### Claim 12 (depends on 11) The substrate according to claim 11, wherein, in top view, a distance from the third boundary to an outer edge of the first portion is 100 μm or more. ### Claim 13 (depends on 1) The substrate according to claim 1, wherein, in top view, the first boundary includes a curved portion. ### Claim 14 (depends on 1) A light-emitting device comprising: the substrate according to claim 1; and a light-emitting element provided on the substrate, wherein the light-emitting element is connected to the gold layer in the second portion. ### Claim 15 (depends on 14) The light-emitting device according to claim 14, wherein the covering member covers the light-emitting element. ### Claim 16 A substrate, comprising: a base including a primary surface; and a conductive member disposed on the primary surface, wherein the conductive member comprises: a first portion including a first conductive layer and an aluminum layer layered in order from a bottom of the conductive member; a second portion including a gold layer on an uppermost surface of the second portion of the conductive member; and a third portion including the gold layer, the first conductive layer, and the aluminum layer layered in order from the bottom of the conductive member, and in top view, an area of the third portion is smaller than an area of the first portion, wherein the conductive member comprises a second conductive layer including a first layer between the gold layer and the base, and wherein a gap is arranged between the first conductive layer and the first layer. ### Claim 17 (depends on 16) The substrate according to claim 16, wherein an end portion of the first layer is positioned in the third portion. ### Claim 18 (depends on 16) A light-emitting device comprising: the substrate according to claim 16; and a light-emitting element provided on the substrate, wherein the light-emitting element is connected to the gold layer in the second portion.