# US 2021/0242429 A1 · Coating solution for light extraction layer of organic light-emitting device and method of manufacturing light extraction substrate of organic light-emitting device by using the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242429 A1 - Document ID: US20210242429A1 - Status: Published application - Kind: A1 - Application number: 17/054,302 - Filed: 2019-05-14 - Published: 2021-08-05 - Earliest claimed: 2018-05-15 - Assignees: Corning Incorporated - Applicants: Corning Incorporated - Inventors: JooYoung Lee - Web page: https://patentgrep.com/patent/US20210242429A1 ## CPC - H10K 50/854: comprising scattering means - C09D 1/00: Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances - C09D 7/20: Diluents or solvents - C09D 7/45: Anti-settling agents - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) ## Abstract A coating solution for a light extraction layer of an organic light-emitting device may include light-scattering particles including a metal oxide; and a solvent. A method of manufacturing a light extraction substrate of an organic light-emitting device can form a light extraction layer on a base substrate, by inkjet coating or spray coating, using the coating solution. ## Claims ### Claim 1 A coating solution for a light extraction layer of an organic light-emitting device, the coating solution comprising: light-scattering particles comprising at least one of a metal oxide and SiO2; and a solvent, wherein the coating solution has a turbiscan stability index (TSI) of 30 or less when measured over 24 hours. ### Claim 2 (depends on 1) The coating solution according to claim 1, wherein the metal oxide comprises at least one selected from the group consisting of TiO2, SiO2, BaTiO3, ZnO, MgO, SnO2, Al2O3, ZrO2, CeO2, Fe2O3, Fe3O4, WO3, Y2O3, SrTiO3, FeTiO3, MnTiO3, Nb2O5, and KTaO3. ### Claim 3 (depends on 1) The coating solution according to claim 1, wherein the solvent comprises at least one selected from the group consisting of butyl cellosolve, diacetone alcohol, dipropylene glycol methyl ether, a-terpineol, benzyl alcohol, dodecane, formamide, ethyl-3-ethoxypropionate, N-methyl-2-pyrrolidone, diethylene glycol monomethyl ether, siloxane, silsesquioxane, silazane, a siloxane derivative, a silsesquioxane derivative, and a silazane derivative. ### Claim 4 (depends on 1) The coating solution according to claim 1, wherein a weight of the light-scattering particles is 50% or less of a weight of the coating solution. ### Claim 5 (depends on 1) The coating solution according to claim 1, further comprising a dispersant. ### Claim 6 (depends on 5) The coating solution according to claim 5, wherein the dispersant comprises at least one selected from the group consisting of alkylammonium salt of polymer, polyether phosphate, polyethylene glycol octylphenyl ether, poly(ethylene oxide), secondary alcohol ethoxylate, acrylate polymers, and 2-(dibutylamino)ethanol. ### Claim 7 (depends on 5) The coating solution according to claim 5, wherein a weight of the dispersant is 15% or less of a weight of the light-scattering particles. ### Claim 8 (depends on 1) The coating solution according to claim 1, wherein the light-scattering particles have particle sizes ranging from 20 nm to 50 nm. ### Claim 9 (depends on 1) The coating solution according to claim 1, wherein the coating solution has a surface tension ranging from 10 dyne/cm to 70 dyne/cm. ### Claim 10 (depends on 1) The coating solution according to claim 1, wherein the coating solution has a viscosity ranging from 0.1 cp to 20 cp. ### Claim 11 (depends on 10) The coating solution according to claim 10, wherein the coating solution has a viscosity ranging from 5 cp to 15 cp. ### Claim 12 A method of manufacturing a light extraction substrate of an organic light-emitting device, the method comprising: forming a light extraction layer on a base substrate by using a coating solution, wherein the coating solution comprises: light-scattering particles comprising at least one of a metal oxide and SiO2; and a solvent, and wherein the coating solution has a turbiscan stability index (TSI) of 30 or less when measured over 24 hours. ### Claim 13 (depends on 12) The method according to claim 12, wherein forming the light extraction layer comprises coating the base substrate with the light extraction layer by inkjet coating or spray coating. ### Claim 14 An apparatus for manufacturing a light extraction substrate of an organic light-emitting device, wherein the apparatus is configured to form a light extraction layer by coating a base substrate with a coating solution, wherein the coating solution comprises: light-scattering particles comprising at least one of a metal oxide and SiO2; and a solvent, and wherein the coating solution has a turbiscan stability index (TSI) of 30 or less when measured over 24 hours.