# US 12,004,418 B2 · Luminescent film, preparation method thereof, and electroluminescent device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,418 B2 - Document ID: US12004418B2 - Status: Granted - Kind: B2 - Application number: 17/432,445 - Filed: 2021-02-03 - Published: 2023-05-11 - Granted: 2024-06-04 - Earliest claimed: 2020-03-23 - Assignees: Boe Technology Group Co., Ltd. - Applicants: BOE Technology Group Co., Ltd. - Inventors: Haizheng Zhong; Dengbao Han; Chenhui Wang; Shuai Chang; Yang Liu; Xiang Miao - Web page: https://patentgrep.com/patent/US12004418B2 ## CPC - C09K 11/06: containing organic luminescent materials - C09K 11/025: {non-luminescent particle coatings or suspension media} - H10K 71/10: Deposition of organic active material - H10K 85/50: Organic perovskites; Hybrid organic-inorganic perovskites [HOIP], e.g. CH3NH3PbI3 - C09K 2211/188: of other metals not provided for in one of the previous groups - H10K 50/11: characterised by the electroluminescent [EL] layers - H10K 71/00: Manufacture or treatment specially adapted for the organic devices covered by this subclass - H10K 71/12: using liquid deposition, e.g. spin coating - Y02E 10/549: Organic PV cells - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - H10K: ORGANIC ELECTRIC SOLID-STATE DEVICES - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract The disclosure relates to the technical field of display, in particular to a luminescent film, a preparation method thereof, and an electroluminescent device. The luminescent film comprises: a crystallized blue-light perovskite material, and halogenated amine ligand materials grafted on the crystallized blue-light perovskite material, wherein the crystallized blue-light perovskite material comprises 3D perovskite nano-crystals; and the halogenated amine ligand materials comprise a first halogenated amine ligand material and a second halogenated amine ligand material, and the first halogenated amine ligand material is different from the second halogenated amine ligand material. The disclosure is suitable for manufacturing luminescent films and electroluminescent devices. ## Claims ### Claim 1 A luminescent film, comprising: a crystallized blue-light perovskite material, and halogenated amine ligand materials grafted on the crystallized blue-light perovskite material; wherein, the crystallized blue-light perovskite material comprises 3D perovskite nano-crystals; and the halogenated amine ligand materials comprise: a first halogenated amine ligand material and a second halogenated amine ligand material, and the first halogenated amine ligand material is different from the second halogenated amine ligand material. ### Claim 2 (depends on 1) The luminescent film according to claim 1, wherein the first halogenated amine ligand material and the second halogenated amine ligand material are grafted on the crystallized blue-light perovskite material. ### Claim 3 (depends on 1) The luminescent film according to claim 1, wherein the 3D perovskite nano-crystals have a particle size of 10 nm-20 nm. ### Claim 4 (depends on 1) The luminescent film according to claim 1, wherein the blue-light perovskite material comprises a perovskite material with a molecular structure ABX3, wherein A comprises any one or more of an organic amine group, formamidine and cesium ions, B comprises lead ions, and X comprises a combination of chlorine and bromine. ### Claim 5 (depends on 4) The luminescent film according to claim 4, wherein the organic amine group comprises methylamine, ethylamine, or propylamine. ### Claim 6 (depends on 1) The luminescent film according to claim 1, wherein the first halogenated amine ligand material is a brominated amine ligand material, and the second halogenated amine ligand material is an aromatic halogenated amine material. ### Claim 7 (depends on 6) The luminescent film according to claim 6, wherein: the brominated amine ligand material comprises any one of brominated 3,3-diphenyl propylamine, brominated ethylamine, brominated butylamine and brominated octylamine. ### Claim 8 (depends on 6) The luminescent film according to claim 6, wherein the aromatic halogenated amine material comprises any one of phenylethyl amine bromide, benzyl amine bromide, P-fluorophenyl amine bromide, O-fluorophenyl amine bromide and M-fluorophenyl amine bromide. ### Claim 9 (depends on 1) A preparation method of the luminescent film according to claim 1, comprising: dissolving a first blue-light perovskite reaction material, a first halogenated amine ligand material and a second halogenated amine ligand material in a first solvent to form a first precursor solution; dissolving a second blue-light perovskite reaction material in a second solvent to form a second precursor solution; stirring the first precursor solution and the second precursor solution, and mixing the two after stirring to form a blue-light perovskite precursor solution; forming the blue-light perovskite precursor solution on a substrate by a spin-coating process; and dropwise adding an anti-solvent to the blue-light perovskite precursor solution formed on the substrate within a preset time to crystallize a blue-light perovskite material, and grafting the first halogenated amine ligand material and the second halogenated amine ligand material on the crystallized blue-light perovskite material to form a blue-light luminescent film. ### Claim 10 (depends on 9) The preparation method according to claim 9, wherein the first blue-light perovskite reaction material comprises any one or more of an organic amine group, formamidine and cesium ions, and the second blue-light perovskite reaction material comprises lead ions. ### Claim 11 (depends on 10) The preparation method according to claim 10, wherein the first blue-light perovskite reaction material comprises cesium chloride, and the second blue-light perovskite reaction material comprises lead bromide. ### Claim 12 (depends on 9) The preparation method according to claim 9, wherein the first halogenated amine ligand material is a brominated amine ligand material, and the second halogenated amine ligand material is an aromatic halogenated amine material. ### Claim 13 (depends on 12) The preparation method according to claim 12, wherein the first halogenated amine ligand material comprises brominated 3,3-diphenylpropyl amine, the second halogenated amine ligand material comprises phenethyl amine bromide. ### Claim 14 (depends on 13) The preparation method according to claim 13, wherein the molar ratio of the brominated 3,3-diphenylpropyl amine to the phenethyl amine bromide is 4:4. ### Claim 15 (depends on 9) The preparation method according to claim 9, wherein the first solvent and the second solvent comprise dimethyl sulfoxide. ### Claim 16 (depends on 9) The preparation method according to claim 9, wherein the anti-solvent comprises any one of methylbenzene, chloroform, chlorobenzene, acetone and ethyl acetate. ### Claim 17 (depends on 1) An electroluminescent device, comprising an anode, a cathode, and a luminescent layer located between the anode and the cathode, wherein the luminescent layer comprises the luminescent film according to claim 1. ### Claim 18 (depends on 17) The electroluminescent device according to claim 17, further comprising a substrate disposed below the anode, a hole injection layer and a hole transporting layer disposed between the anode and the luminescent layer, and an electron injection layer and an electron transporting layer disposed between the cathode and the luminescent layer. ### Claim 19 (depends on 18) The electroluminescent device according to claim 18, wherein a preparation method of the electroluminescent device comprises: wiping and ultrasonically cleaning the substrate sequentially with deionized water, an acetone solution, an ethanol solution and an isopropanol solution, drying the substrate with nitrogen for use, and pre-processing the cleaned substrate with oxygen plasma to clean a surface of the substrate and improve the wettability of the surface of the substrate; forming the anode on the substrate; sequentially forming the hole injection layer and the hole transporting layer on the anode; forming the luminescent layer on the hole transporting layer; transferring the substrate into a vacuum cavity, and sequentially forming the electron transporting layer and the electron injection layer; forming the cathode on the electron injection layer; and transferring the substrate into a glove box for packaging to form the electroluminescent device. ### Claim 20 (depends on 17) A displaying device, comprising the electroluminescent device according to claim 17.