# US 2025/0098477 A1 · Light-emitting device and method for manufacturing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0098477 A1 - Document ID: US20250098477A1 - Status: Published application - Kind: A1 - Application number: 18/730,311 - Filed: 2022-03-24 - Published: 2025-03-20 - Earliest claimed: 2022-03-24 - Assignees: Sharp Display Tichnology Corporation - Applicants: Sharp Display Tichnology Corporation - Inventors: Youhei NAKANISHI; Takeshi ISHIDA; Alessandro MINOTTO; Peter Neil TAYLOR; Valerie BERRYMAN-BOUSQUET - Web page: https://patentgrep.com/patent/US20250098477A1 ## CPC - H10K 59/771: {Integrated devices comprising a common active layer} - H05B 33/10: Apparatus or processes specially adapted to the manufacture of electroluminescent light sources - H05B 33/12: Light sources with substantially two-dimensional [2D] radiating surfaces - H05B 33/14: characterised by the chemical or physical composition or the arrangement of the electroluminescent material {, or by the simultaneous addition of the electroluminescent material in or onto the light source} - H05B 33/22: characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers - H10K 50/00: Organic light-emitting devices (integrated devices or assemblies of multiple devices H10K59/00, H10K65/00; organic semiconductor lasers H01S5/36) - H10K 59/00: Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00 - H10K 59/1201: {Manufacture or treatment} - H10K 59/35: comprising red-green-blue [RGB] subpixels - H10K 59/353: {characterised by the geometrical arrangement of the RGB subpixels} - B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals - B82Y 40/00: Manufacture or treatment of nanostructures - H10K 50/115: comprising active inorganic nanostructures, e.g. luminescent quantum dots - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES ## Abstract A light-emitting device includes at least one light-emitting region. The at least one light-emitting region includes: a lower electrode in plan view; an upper electrode provided across from at least one lower electrode including the lower electrode; and a plurality of functional layers stacked on top of another between the lower electrode and the upper electrode. The plurality of functional layers include at least: a light-emitting layer provided between the lower electrode and the upper electrode; and a first functional layer provided between the lower electrode and the light-emitting layer, and adjacent to the light-emitting layer. The light-emitting layer contains quantum dots, ligands, and a photo-crosslinking agent. The first functional layer contains a photocurable resin. An end face of the light-emitting layer and an end face of the first functional layer are flush with each other. ## Claims ### Claim 1 A light-emitting device, comprising at least one light-emitting region, wherein the at least one light-emitting region includes: a lower electrode in plan view; an upper electrode provided across from at least one lower electrode including the lower electrode; and a plurality of functional layers stacked on top of another between the lower electrode and the upper electrode, the plurality of functional layers include at least: a light-emitting layer provided between the lower electrode and the upper electrode; and a first functional layer provided between the lower electrode and the light-emitting layer, and adjacent to the light-emitting layer, the light-emitting layer contains quantum dots, ligands, and a photo-crosslinking agent, the first functional layer contains a photocurable resin, and an end face of the light-emitting layer and an end face of the first functional layer are flush with each other. ### Claim 2 (depends on 1) The light-emitting device according to claim 1, wherein the at least one light-emitting region includes a plurality of light-emitting regions, the plurality of light-emitting regions include: a plurality of lower electrodes including the lower electrode in plan view; and the plurality of functional layers provided between each of a plurality of the lower electrodes and the upper electrode. ### Claim 3 (depends on 2) The light-emitting device according to claim 2, wherein, for each of the plurality of light-emitting regions, the light-emitting layer has a different peak emission wavelength. ### Claim 4 (depends on 3) The light-emitting device according to claim 3, wherein the plurality of light-emitting regions include: a red light-emitting region configured to emit a red light; a green light-emitting region configured to emit a green light; and a blue light-emitting region configured to emit a blue light, and the first functional layer is thickest in the red light-emitting region and thinnest in the blue light-emitting region. ### Claim 5 (depends on 1) The light-emitting device according to claim 1, wherein the first functional layer is insoluble in an organic solvent containing 80 vol % or more of a solvent having both a polarity term and a hydrogen bonding term of 0 among Hansen solubility parameter values. ### Claim 6 (depends on 1) The light-emitting device according to claim 1, wherein the ligands are nonpolar ligands. ### Claim 7 (depends on 1) The light-emitting device according to claim 1, wherein the photo-crosslinking agent contains polyazide containing two or more azide groups or nitrene groups. ### Claim 8 (depends on 7) The light-emitting device according to claim 7, wherein the polyazide contain at least one selected from the group consisting of compounds represented by Formulae (1) to (10) below: wherein each of R1 and R2 independently represents an azide group or a nitrene group, wherein each of R3 and R4 independently represents an azide group or a nitrene group, wherein each of R5 and R6 independently represents an azide group or a nitrene group, wherein each of R7 and R8 independently represents an azide group or a nitrene group, wherein each of R9 and R10 independently represents an azide group or a nitrene group, wherein each of R11 and R12 independently represents an azide group or a nitrene group, wherein each of R13 and R14 independently represents an azide group or a nitrene group, wherein each of R15 and R16 independently represents an azide group or a nitrene group, wherein each of R17 and R18 independently represents an azide group or a nitrene group, and wherein each of R19 and R20 independently represents an azide group or a nitrene group, and n represents either 0 or 1. ### Claim 9 (depends on 1) The light-emitting device according to claim 1, wherein the photo-crosslinking agent and the photocurable resin are formed of a material to be activated by light having an equal wavelength. ### Claim 10 (depends on 9) The light-emitting device according to claim 9, wherein the light is UV light. ### Claim 11 (depends on 1) The light-emitting device according to claim 1, wherein the first functional layer is a charge transport layer. ### Claim 12 (depends on 11) The light-emitting device according to claim 11, wherein the charge transport layer is a hole transport layer. ### Claim 13 (depends on 1) The light-emitting device according to claim 1, wherein the first functional layer further contains a photopolymerization initiator. ### Claim 14 (depends on 1) The light-emitting device according to claim 1, wherein the plurality of functional layers include a second functional layer provided between the lower electrode and the first functional layer, and adjacent to a plurality of lower electrodes including the lower electrode, the second functional layer covers the lower electrode, and the end face of the light-emitting layer and the end face of the first functional layer are positioned outside an end face of the lower electrode. ### Claim 15 (depends on 14) The light-emitting device according to claim 14, further comprising an edge cover covering an edge of the lower electrode, wherein, in plan view, a shortest distance between: an end of a region in which the lower electrode and the second functional layer are in direct contact with each other; and the end faces of light-emitting layer and the first functional layer is longer than a sum of thicknesses of the plurality of functional layers between the lower electrode and the upper electrode. ### Claim 16 (depends on 1) The light-emitting device according to claim 1, wherein the upper electrode is a light-transparent electrode, and the lower electrode includes: a reflective electrode; and a light-transparent electrode provided above the reflective electrode. ### Claim 17 A method for manufacturing a light-emitting device including at least one light-emitting region, the method comprising: a lower electrode forming step of forming, in plan view, a lower electrode in the at least one light-emitting region; a functional layer forming step of forming a plurality of functional layers above the lower electrode in the at least one light-emitting region; and an upper electrode forming step of forming an upper electrode, across from at least one lower electrode including the lower electrode, above the plurality of functional layers in the at least one light-emitting region, wherein the functional layer forming step includes: a first-functional-film depositing step of depositing a first functional film containing a photocurable compound; a quantum-dot-containing-film depositing step of depositing a quantum-dot-containing film above, and adjacent to, the first functional film, the quantum-dot-containing film containing the quantum dots, ligands, and photo-crosslinking agent; a quantum-dot-containing-film exposing step of exposing a first region, which is a portion of the quantum-dot-containing film, with light to activate the photo-crosslinking agent, and crosslinking the photo-crosslinking agent and the ligands in the first region; a first-functional-film exposing step of exposing a second region, which is included in the first functional film and overlaps with the first region, with light to activate the photocurable compound, and curing the photocurable compound in the second region to form a photocurable resin; and a patterning step of developing to pattern the quantum-dot-containing film and the first functional film, so that the quantum-dot-containing film is patterned to form a light-emitting layer, and the first functional film is patterned to form a first functional layer having an end face flush with an end face of the light-emitting layer. ### Claim 18 (depends on 17) The method for manufacturing the light-emitting device according to claim 17, wherein the photocurable compound and the photo-crosslinking agent are materials to be activated by light having an equal wavelength; and at the quantum-dot-containing-film exposing step and at the first-functional-film exposing step, the first region and the second region are irradiated with light having the equal wavelength, so that the quantum-dot-containing-film exposing step and the first-functional-film exposing step are carried out in parallel.