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Preparation method of metal halide perovskite quantum dots

A technology of metal halides and quantum dots, applied in chemical instruments and methods, luminescent materials, nanotechnology, etc., can solve the problems of good dispersion and poor water stability of metal halide perovskite quantum dots, and achieve a leap in stability Effect

Active Publication Date: 2018-01-19
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

[0006] For the above defects or improvement needs of the prior art, the object of the present invention is to provide a method for preparing metal halide perovskite quantum dots, wherein the key overall process design and each process step (including The types of reactants in each step, reaction conditions and parameters, etc.) are improved, and compared with the prior art, it can effectively solve the problem of metal halide perovskite quantum dots (such as CsPbX 3 Quantum dots) poor water stability problem, while maintaining CsPbX 3 Quantum dots are dispersed in water as single particles while maintaining their colloidal stability and fluorescence stability, and the CsPbX prepared by this method 3 Metal halide perovskite quantum dots have good dispersibility, and can be in the state of single particle dispersion in aqueous solution, and the dispersibility is good, so that the CsPbX 3 Quantum dots are especially useful as fluorescent molecular probes

Method used

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  • Preparation method of metal halide perovskite quantum dots
  • Preparation method of metal halide perovskite quantum dots
  • Preparation method of metal halide perovskite quantum dots

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preparation example Construction

[0043] The preparation method of metal halide perovskite quantum dots with high water stability in the present invention to prepare CsPbBr 3 The quantum dots of Quantum Dots are taken as an example, and generally include the following steps: adopt HBr aqueous solution to first dissolve cesium-containing compounds and lead-containing compounds (such as metal cesium lead salts CsBr and PbBr 2 ), and then mixed with DMF (or DMSO) to obtain the corresponding precursor aqueous solution (these two precursor aqueous solutions can be pre-mixed, or can be prepared separately and mixed with the liquid fluorine-containing reagent in subsequent steps); The fluorine reagent is used as the oil phase (that is, a liquid, hydrophobic fluorine-containing reagent); after mixing the precursor aqueous solution with the oil phase for shaking or stirring, the quantum dots are generated at the liquid-liquid interface (that is, the water phase and the oil phase Interface), then add the basic ligand, m...

Embodiment 1

[0062] Step 1, metal halide PbBr 2 and CsBr were dissolved in 40% HBr aqueous solution at room temperature to form PbBr 2 Metal halide solution, and CsBr metal halide solution (the corresponding metal halide can be completely dissolved by shaking or stirring at room temperature), PbBr 2 The metal halide solution and the corresponding metal halide concentration in the CsBr metal halide solution are both 1M.

[0063] Step 2, the prepared 1M PbBr 2 Solution and CsBr solution were taken 0.1mL, successively added to 1mL of aprotic polar solvent DMF, mixed evenly, a colorless solution.

[0064] In this step 2, in addition to adding PbBr respectively in the above-mentioned DMF 2 solution and CsBr solution in this way, it is also possible to add 1M PbBr 2 Both the solution and the CsBr solution were pre-mixed, and then DMF was added to the mixed solution.

[0065] Step 3. Take 0.1 mL of fluorine-containing reagent (such as tridecafluorooctyltriethoxysilane) and add it to the colo...

Embodiment 2

[0071] This embodiment is the same as embodiment 1, the only difference is that the metal salt concentration added in step 1 is 0.2M, and the others are the same as embodiment 1.

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Abstract

The invention discloses a preparation method of metal halide perovskite quantum dots. The method is characterized in that a liquid state hydrophobic fluorine-containing reagent and a precursor aqueoussolution used for preparing a metal halide perovskite material are mixed to obtain an emulsion, the metal halide perovskite quantum dots are synthesized in the emulsion, the surface of the metal halide perovskite quantum dots are tightly coated with the hydrophobic fluorine-containing reagent, so that the metal halide perovskite quantum dots which can dispersed in an aqueous solution as a singleparticle state are obtained. Through key integral process flow design and each technological step improvement for the preparation method, compared with the prior art, the problem of poor stability ofCsPbX3 quantum dots can be effectively solved, and the CsPbX3 metal halide perovskite quantum dots prepared by the invention have good dispersibility.

Description

technical field [0001] The invention belongs to the field of preparation of new materials, and more specifically relates to a method for preparing metal halide perovskite quantum dots. The metal halide perovskite quantum dots obtained by the preparation method have outstanding advantages such as high water stability and high dispersibility. advantage. Background technique [0002] One of the most important biological applications of quantum dots is as a fluorescent probe: organic fluorescent agents and biomarker fluorescent proteins currently used for biomarkers are prone to bleaching, and the fluorescence emission peak is too broad, which is not conducive to multi-color labeling and long-term imaging and other issues; quantum dots have adjustable energy bands, strong fluorescence (tens of times stronger than rhodamine 60, etc.), narrow luminescence peaks, strong photostability (hundred times stronger than ordinary small molecule organic dyes), and long fluorescence lifetime...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66B82Y40/00
Inventor 唐江李吒牛广达陈正午胡青松
Owner HUAZHONG UNIV OF SCI & TECH
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