Method for making a perovskite quantum dot material
AssigneeShenzhen Tcl New Technology Co., Ltd.
InventorsHaizheng Zhong, Feng Zhang, Xiangang Wu, Hailong Huang, Yuwei Niu
Life of this patent
Estimating the term…
Abstract
Provided is a hybridized perovskite quantum dot material. The quantum dot material comprises a kernel and surface ligands. The kernel is formed by R1NH3AB3 or (R2NH3)2AB4, where R1 is methyl group, R2 is an organic molecular group, A is at least one selected from Ge, Sn, Pb, Sb, Bi, Cu and Mn, B is at least one selected from Cl, Br and I, A and B form a coordination octahedral structure, and R1NH3 or R2NH3 is filled in gaps of the coordination octahedral structure. The surface ligand is an organic acid or organic amine. The quantum dot material has a high fluorescence quantum yield.
Claims16
A method for making a hybridized perovskite quantum dot material, comprising:
- (1) dissolving an inorganic metal halide and an organic ammonium halide in a first solvent to obtain a precursor solution in which both the inorganic metal halide and the organic ammonium halide exist in a dispersed form;
- and
- (2) adding the precursor solution dropwise to a second solvent, wherein the solubility of the inorganic metal halide and the organic ammonium halide in the first solvent is different from that in the second solvent, enabling the inorganic metal halide and the organic ammonium halide to be self-assembled, so that an inorganic metal cation of the inorganic metal halide and halogen anions of the organic ammonium halide form a coordination octahedral structure;
- organic ammonium cations of the organic ammonium halide enter into gaps of the coordination octahedral structure to obtain the hybridized perovskite quantum dot material,
- wherein a surface ligand has been added in advance to one or more selected from a group consisting of the first solvent and the second solvent, and the surface ligand is an organic acid or a long-chain organic amine.
A method for making a hybridized perovskite quantum dot material, comprising:
- (1) dissolving an inorganic metal halide and an organic ammonium halide or a halide of cesium in a first solvent to obtain a precursor solution, wherein the inorganic metal halide, the organic ammonium halide and the halide of cesium exist in a dispersed form;
- (2) adding the precursor solution to a second solvent to form an emulsion system, wherein a surface ligand has been added in advance to one or more selected from a group consisting of the first solvent and the second solvent and the surface ligand is an organic acid or a long-chain organic amine;
- and the first solvent and the second are immiscible, the emulsion system contains micelles formed by the surface ligands, the precursor solution is encapsulated in the micelles, and the micelles are dispersed in the second solvent;
- and
- (3) adding a demulsifier to the emulsion system so that the precursor solution in the micelles is diffused into the second solvent, enabling the inorganic metal halide, and the organic ammonium halide or halide of cesium to be self-assembled;
- an inorganic metal cation of the inorganic metal halide and the halogen anions of the organic ammonium halide or halide of cesium form a coordination octahedral structure;
- and organic ammonium cations of the organic ammonium halide enter into gaps of the coordination octahedral structure to form the perovskite quantum dot material;
- wherein the inorganic metal halide is one or more selected from a group consisting of halides of Ge, Sn, Pb, Sb, Bi, Cu and Mn, the halide includes one or more selected from a group consisting of chloride, bromide and iodide, the first solvent is one or more selected from a group consisting of N,N-dimethyl formamide, acetonitrile, N-methyl pyrrolidinone and dimethyl sulfoxide, the second solvent is one or more selected from a group consisting of 1-octadecene, n-hexane, cyclohexane and n-heptane, and a surface ligand has been added in advance to one or more selected from a group consisting of the first solvent and the second solvent, and the surface ligand is an organic acid or a long-chain organic amine.
Dependencies are inferred from the claim text.