Organic-inorganic hybrid perovskite quantum dot and preparation method thereof

A perovskite and quantum dot technology, applied in chemical instruments and methods, nanotechnology, nano-optics, etc., can solve the problem of poor stability of quantum dots, easy decomposition, and restrictions on the industrial application of organic-inorganic hybrid perovskite quantum dots, etc. problem, to achieve the effect of stabilizing luminous performance, improving stability, and improving water and oxygen stability

Active Publication Date: 2017-05-10
MINZU UNIVERSITY OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the quantum dots prepared by the method reported in the literature above have poor stability and are easily decomposed when exposed to water, which greatly limits the industrial application of organic-inorganic hybrid perovskite quantum dots.

Method used

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  • Organic-inorganic hybrid perovskite quantum dot and preparation method thereof
  • Organic-inorganic hybrid perovskite quantum dot and preparation method thereof
  • Organic-inorganic hybrid perovskite quantum dot and preparation method thereof

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preparation example Construction

[0042] Correspondingly, the present invention also provides a method for preparing organic-inorganic hybrid perovskite quantum dots, comprising the following steps:

[0043] Using siloxane with amino-terminated siloxane as a ligand, mix it with a transition metal halide and an organic amine compound in a first solvent to form a precursor solution; the first solvent is DMF, dimethyl sulfoxide, THF, acetonitrile or acetone; the organic amine compound is methyl ammonium halide or phenethylamine halide;

[0044] The precursor solution is mixed with a second solvent, and precipitation occurs in a non-airtight state to obtain organic-inorganic hybrid perovskite quantum dots with a silicon dioxide layer on the surface; the second solvent is toluene, chloroform, n-hexane, Cyclohexane, ethyl acetate or ether.

[0045] Through the optimized production process and other contents of the embodiments of the present invention, a hybrid perovskite quantum dot material with a single emission ...

Embodiment 1

[0065] 1mmol PbBr 2 , 0.8 mmol CH 3 NH 3 Br and 1.38mmol APTS were miscible in DMF, and the resulting mixed solution was injected into rapidly stirring toluene, resulting in precipitation, and a solution sample of organic-inorganic hybrid perovskite quantum dots was obtained.

[0066] Stir the solution sample for 2 hours, then centrifuge (3000rpm, 15min), add ethanol, stir and centrifuge (3000rpm, 15min), dry at 50°C, grind the dried solid to obtain 460mg of yellow powder, which is organic and inorganic impurities. halide perovskite quantum dot material with CH in the core 3 NH 3 PbBr 3 . Calculate by calculating the yield formula 1., obtain final yield and be 65%;

[0067] Yield rate = total output mass / total input mass × 100% formula ①.

[0068] The perovskite quantum dot solution sample obtained in embodiment 1 is carried out transmission electron microscope (TEM) analysis, the result sees figure 1 , figure 1 It is the TEM result of the quantum dot material obtaine...

Embodiment 2

[0075] 1mmol PbBr 2 , 0.8 mmol CH 3 NH 3 Br and 2.0mmol APTS were miscible in DMF, and the resulting mixed solution was injected into rapidly stirring toluene to produce precipitation, and a solution sample of organic-inorganic hybrid perovskite quantum dots was obtained.

[0076] According to the same method in Example 1, centrifuge successively, dry, obtain yellow-green solid after drying, as Figure 4 The first sample on the left in the center was ground to obtain 412.6 mg of organic-inorganic hybrid perovskite quantum dot material in the form of solid powder.

[0077] The emission spectrum of the solution sample is as image 3 shown, from image 3 The middle left curve can be obtained, the emission wavelength is 510nm, and the emission peak is narrow.

[0078] The situation of gained solid state material under the ultraviolet lamp sees Figure 5 The sample on the left side of the middle; the solid powder fluorescence quantum yield of the obtained material is detected...

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Abstract

The invention provides an organic-inorganic hybrid perovskite quantum dot and a preparation method thereof. The quantum dot is prepared by taking siloxane with amino terminated as ligand and adopting a re-precipitation method aided by the ligand. The quantum dot comprises a core, and a general formula of the core is CH3NH3AX3 or (C6H5NH3)2AX4, wherein A is selected from transition metal element, and X is selected from halogen; a silicon dioxide layer is arranged on the surface of the organic-inorganic hybrid perovskite quantum dot. The siloxane with amino terminated is adopted as the ligand, so that size of the perovskite quantum dot can be controlled better, and luminous performance is stable. In addition, siloxane with amino terminated is used, and the re-precipitation method aided by the ligand is adopted, and the silicon dioxide layer is formed on the surfaces of perovskite nanoparticles, so that water oxygen stability of a perovskite nano material can be improved, and feasibility of the nano material in actual application is improved.

Description

technical field [0001] The invention relates to the technical field of perovskite quantum dot materials, in particular to an organic-inorganic hybrid perovskite quantum dot and a preparation method thereof. Background technique [0002] Quantum dots can also be called nanocrystals, which are composed of a limited number of atoms and aggregates of atoms and molecules whose three dimensions are on the order of nanometers. The movement of internal electrons in all directions is restricted, so its quantum dots The domain effect is particularly pronounced. Based on quantum effects, quantum dots have broad application prospects in the fields of solar cells, light-emitting devices, and optical biomarkers. Among the various quantum dots, perovskite-based quantum dots have attracted great attention due to their excellent luminescent properties, such as high luminous efficiency and narrow emission lines. The perovskite structure is in the form of cubic crystals, among which, the all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/66B82Y30/00B82Y20/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/025C09K11/664
Inventor 彭洪尚杨牧
Owner MINZU UNIVERSITY OF CHINA
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