# US 10,873,003 B2 · Quantum dot complex and its manufacturing method, intermediate and applications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,003 B2 - Document ID: US10873003B2 - Status: Granted - Kind: B2 - Application number: 15/781,309 - Filed: 2017-10-27 - Published: 2019-08-29 - Granted: 2020-12-22 - Earliest claimed: 2017-03-22 - Assignees: Boe Technology Group Co., Ltd. - Applicants: Boe Technology Group Co., Ltd. - Inventors: Zhuo Chen - Web page: https://patentgrep.com/patent/US10873003B2 ## CPC - H10H 20/812: within the light-emitting regions, e.g. having quantum confinement structures - C08F 212/08: Styrene - C08F 292/00: Macromolecular compounds obtained by polymerising monomers on to inorganic materials - C08G 61/08: of carbocyclic compounds containing one or more carbon-to-carbon double bonds in the ring - C09D 11/10: based on artificial resins - C09D 11/36: based on non-aqueous solvents - C09D 11/38: characterised by non-macromolecular additives other than solvents, pigments or dyes - C09D 11/50: Sympathetic, colour changing or similar inks - C08F 2438/03: Use of a di- or tri-thiocarbonylthio compound, e.g. di- or tri-thioester, di- or tri-thiocarbamate, or a xanthate as chain transfer agent, e.g . Reversible Addition Fragmentation chain Transfer [RAFT] or Macromolecular Design via Interchange of Xanthates [MADIX] - C08G 2261/3321: derived from cyclopentene - C08G 2261/418: Ring opening metathesis polymerisation [ROMP] - C08G 2261/77: grafting - C08G 2261/96: coating of particles - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - 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 quantum dot complex and its manufacturing method, intermediate and applications are provided. The quantum dot complex includes a quantum dot and a plurality of polymeric chain ligands, wherein each of the polymeric chain ligands includes a coordination unit and at least one polymeric chain, and the coordination unit connects the quantum dot with the polymeric chain; and the polymeric chain has a molecular weight distribution of not more than about 1.3. The surface of the quantum dot in the quantum dot complex is bonded to a plurality of polymeric chain ligands by coordination, and the length of the polymeric chain is accurately controllable, so that the viscosity and surface tension of an ink containing the quantum dot complex can be effectively controlled. Moreover, additives can be avoided and a low boiling point solvent can also be used, thereby ensuring the purity of the quantum dots in the ink. ## Claims ### Claim 1 A quantum dot complex for inkjet printing, comprising: a quantum dot; and polymeric chain ligands, Wherein each of the polymeric chain ligands comprises a coordination unit and at least one polymeric chain, and the coordination unit connects the quantum dot with the polymeric chain; wherein the polymeric chain has a molecular weight distribution of not more than about 1.3; the coordination unit comprises at least one of a coordination element and a coordination group; the coordination element, if present, comprises at least one of nitrogen, phosphorus, oxygen and sulfur; the coordination group, if present, comprises at least one of carboxyl group, hydroxyl group and amine group; and the polymeric chain comprises at least one of PS, polycyclopentene, polycarbazole and polypurine. ### Claim 2 (depends on 1) The quantum dot complex according to claim 1, wherein the polymeric chain comprises an unsaturated group, and the unsaturated group comprises an alkenyl group. ### Claim 3 (depends on 1) The quantum dot complex according to claim 1, wherein the coordination unit further comprises: at least one branch chain, which is a carbon chain having 5 to 10 carbon atoms and is connected with the at least one of the coordination element and the coordination group. ### Claim 4 (depends on 1) A method for manufacturing the quantum dot complex according to claim 1, comprising: providing the quantum dot; and bonding the polymeric chain ligand to the quantum dot by coordination, wherein the polymeric chain in the polymeric chain ligand is connected with the quantum dot via the coordination unit. ### Claim 5 (depends on 4) The method according to claim 4, wherein the bonding the polymeric chain ligand to the quantum dot by coordination is realized by the following steps: producing the quantum dot connected to the coordination unit, wherein the coordination unit is bonded to the quantum dot by coordination; and forming the polymeric chain by an active polymerization, wherein the polymeric chain is connected with the quantum dot via the coordination unit to obtain the polymeric chain ligand. ### Claim 6 (depends on 5) The method according to claim 5, wherein the polymeric chain comprises an alkenyl group, and the method further comprises: adding a crosslinking agent after forming the polymeric chain to facilitate crosslinking reaction of alkenyls in the polymeric chain ligand. ### Claim 7 (depends on 4) The method according to claim 4, wherein the active polymerization is performed at a temperature not more than about 100 in a solvent comprising at least one of toluene and tetrahydrofuran. ### Claim 8 (depends on 1) A method for manufacturing the quantum dot complex according to claim 1, comprising: providing a first mother liquid, which comprises a first element, an organic ligand and a first solvent; providing a second mother liquid, which comprises a second element, the organic ligand and a second solvent; adding the first mother liquid to the second mother liquid in an inert atmosphere to form a mixture, stirring and heating at a temperature of about 200 to 350° C., and then cooling down the mixture after reacting for about 30 seconds to 1 hour; separating a precipitate from the cooled mixture by centrifugation and then drying the centrifuged precipitate to obtain the quantum dot connected with the coordination unit; and mixing the quantum dot connected with the coordination unit with an initiator and a monomer for forming through an active polymerization the polymeric chain which is connected with the coordination unit to form the quantum dot complex; wherein the first element and the second element are used to form the quantum dot; each of the first solvent and the second solvent independently comprises at least one of octadecene, trioctylphosphin and trioctyloxyphosphin; the active polymerization reaction is performed at a temperature of about 90 to 100° C., and the active polymerization reaction comprises Atom Transfer Radical Polymerization (ATRP), Reversible Addition-Fragmentation Chain Transfer (RAFT), Nitroxide-Mediated Free Radical Polymerization (NMP), or Ring-Opening Metathesis Polymerization (ROMP). ### Claim 9 (depends on 1) A quantum dot ink, comprising the quantum dot complex according to claim 1, and a low boiling point solvent. ### Claim 10 (depends on 9) A quantum dot light emitting diode device, comprising: a quantum dot light-emitting layer made by printing and crosslinking the quantum dot ink according to claim 9.