# US 2019/0172977 A1 · Light-emitting device and manufacturing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0172977 A1 - Document ID: US20190172977A1 - Status: Published application - Kind: A1 - Application number: 16/259,459 - Filed: 2019-01-28 - Published: 2019-06-06 - Earliest claimed: 2013-11-28 - Assignees: Epistar Corporation - Applicants: Epistar Corporation - Inventors: Fu Chun TSAI; Wen Luh LIAO; Shih I CHEN; Chia Liang HSU; Chih Chiang LU - Web page: https://patentgrep.com/patent/US20190172977A1 ## CPC - H10H 20/835: {Reflective materials} - H10H 20/82: Roughened surfaces, e.g. at the interface between epitaxial layers - H10H 20/824: comprising only Group III-V materials, e.g. GaP - H10H 20/833: Transparent materials - H10H 20/841: Reflective coatings, e.g. dielectric Bragg reflectors - H10H 20/857: Interconnections, e.g. lead-frames, bond wires or solder balls - H10H 20/018: {Bonding of wafers} - H10H 20/032: {of electrodes} - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract A light-emitting device includes a metal connecting structure; a metal reflective layer on the metal connecting structure; a barrier layer between the metal connecting structure and the metal reflective layer; a light-emitting stack on the metal reflective layer; a dielectric layer between the light-emitting stack and the metal reflective layer, and a first extension electrode and a second extension electrode on the light-emitting stack and away from the metal reflective layer. The dielectric layer includes a first part and a second part separated from the first part from a cross section of the light-emitting device. The first extension electrode and the second extension electrode respectively align with the first part and the second part. From a cross section of the light-emitting stack, the first extension electrode has a first width and the first part has a second width larger than the first width. ## Claims ### Claim 1 A light-emitting device, comprising: a metal connecting structure; a metal reflective layer on the metal connecting structure; a barrier layer between the metal connecting structure and the metal reflective layer; a light-emitting stack on the metal reflective layer; a dielectric layer between the light-emitting stack and the metal reflective layer, the dielectric layer comprising a first part and a second part separated from the first part from a cross section of the light-emitting device; and a first extension electrode and a second extension electrode on the light-emitting stack and away from the metal reflective layer, the first extension electrode and the second extension electrode respectively aligning with the first part and the second part, wherein, from a cross section of the light-emitting stack, the first extension electrode comprises a first width and the first part comprises a second width larger than the first width. ### Claim 2 (depends on 1) The light-emitting device of claim 1, further comprising a through hole between the first part and the second part. ### Claim 3 (depends on 2) The light-emitting device of claim 2, wherein, from the cross section view of the light-emitting device, the through hole comprises a third width larger than the first width. ### Claim 4 (depends on 2) The light-emitting device of claim 2, wherein the through hole and the first extension are staggered. ### Claim 5 (depends on 1) The light-emitting device of claim 1, wherein the second extension electrode comprises a width and the second part comprises a width larger than that of the second extension electrode. ### Claim 6 (depends on 1) The light-emitting device of claim 1, wherein the dielectric layer is exposed by the light-emitting stack. ### Claim 7 (depends on 1) The light-emitting device of claim 1, wherein the light-emitting stack comprises a surface away from the metal connecting structure, and the surface comprises: a first portion; and a second portion having a roughness larger than that of the first portion. ### Claim 8 (depends on 7) The light-emitting device of claim 7, wherein the first extension electrode is on the first portion. ### Claim 9 (depends on 1) The light-emitting device of claim 1, wherein the metal connecting structure comprises: a first metal layer having a first metal element; and a second metal layer having a second metal element different from the first metal element. ### Claim 10 (depends on 9) The light-emitting device of claim 9, wherein the metal connecting structure further comprises: a third metal layer having a third metal element on the second metal layer; and a fourth metal layer having a fourth metal element different from the third metal element on the third metal layer. ### Claim 11 (depends on 10) The light-emitting device of claim 10, wherein the first metal layer comprises a same material as the third metal layer. ### Claim 12 (depends on 10) The light-emitting device of claim 10, wherein the second metal layer comprises a same material as the fourth metal layer. ### Claim 13 (depends on 1) The light-emitting device of claim 1, wherein the metal connecting structure and the metal reflective layer comprise a same metal element. ### Claim 14 (depends on 1) The light-emitting device of claim 1, wherein the light-emitting stack comprises: a first conductive type semiconductor layer; a light-emitting layer on the first conductive type semiconductor layer; and a second conductive type semiconductor layer on the light-emitting layer, wherein, from the cross section view of the light-emitting device, the light-emitting layer comprises a fourth width. ### Claim 15 (depends on 14) The light-emitting device of claim 14, wherein from the cross section view of the light-emitting device, the barrier layer comprises a fifth width larger than the fourth width. ### Claim 16 (depends on 14) The light-emitting device of claim 14, wherein from the cross section view of the light-emitting device, the metal connecting structure comprises a sixth width larger than the fourth width. ### Claim 17 (depends on 14) The light-emitting device of claim 14, wherein from the cross section view of the light-emitting device, the metal reflective layer comprises a seventh width larger than the fourth width. ### Claim 18 (depends on 2) The light-emitting device of claim 2, further comprising a conductive oxide layer fills into the through hole. ### Claim 19 (depends on 9) The light-emitting device of claim 9, wherein the metal reflective layer comprises a fifth metal element different from the first metal element and the second metal element, or the metal connecting structure comprises a sixth metal element different from the first metal element and the second metal element. ### Claim 20 (depends on 1) The light-emitting device of claim 1, wherein the metal connecting structure comprises indium, gold or both.