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A stably dispersed all-inorganic perovskite cspbbr 3 Preparation method of nanocrystals

A nanocrystalline, inorganic calcium technology, applied in the fields of nanotechnology, inorganic chemistry, nanotechnology, etc. for materials and surface science, can solve the problems of unstable use, loss of optoelectronic properties, threats to structural stability, etc., and is not easy to deteriorate. Effect

Active Publication Date: 2020-11-03
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although all-inorganic perovskite nanocrystal materials show good application prospects, all-inorganic nanocrystals belong to ionic crystals, and the bonding mode inside the crystal is chemical bonds, which leads to structural instability, mainly in: (1) During long-term storage, the crystals are easy to agglomerate to form larger particles, resulting in deterioration of luminescent properties; (2) due to the influence of the polarity of the cleaning solvent, it poses a huge threat to the structural stability during processing and purification; (3) for In the application of optoelectronic devices, the humidity in the air will affect the quality of the film, resulting in the loss of its optoelectronic properties, which cannot be used stably

Method used

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  • A stably dispersed all-inorganic perovskite cspbbr <sub>3</sub> Preparation method of nanocrystals
  • A stably dispersed all-inorganic perovskite cspbbr <sub>3</sub> Preparation method of nanocrystals
  • A stably dispersed all-inorganic perovskite cspbbr <sub>3</sub> Preparation method of nanocrystals

Examples

Experimental program
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Effect test

Embodiment 1

[0042] (1) 0.4mol of PbBr 2 Add 0.4mol of CsBr into 10mL of DMF, and ultrasonically dissolve it completely to obtain a DMF solution of the metal halide salt;

[0043] (2) Add 10 mg of N-GQDs as a surface modifier into the DMF solution of the above-mentioned metal halide salt, and mix it uniformly to obtain a precursor solution;

[0044] (3) Take 1 mL of the precursor solution and drop it into 10 mL of toluene drop by drop, stir while adding, make it react completely at room temperature, the magnetic stirring speed is 1000r / min, and the obtained reaction product is centrifuged at 8000r / min for 10min , to remove the precipitate to give CsPbBr 3 Perovskite nanocrystal solution.

Embodiment 2

[0046]The preparation process is the same as that of Example 1, except that the amount of N-GQDs added is changed to 20 mg, and other conditions are the same as those of Example 1.

Embodiment 3

[0048] The preparation process is the same as in Example 1, the difference is that in step (1) 1mol PbBr 2 and 1mol CsBr were added in 10 mLDMF, and the amount of N-GQDs added was changed to 30 mg in step (2), and other conditions were the same as in Example 1.

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Abstract

The invention discloses a preparation method of a steadily dispersed totally-inorganic perovskite CsPbBr3 nanocrystalline. The preparation method comprises the steps that (1) metal halide salts PbBr2and CsBr are dissolved in an organic solvent and subjected to ultrasonic dissolution, so that an organic solution of the metal halide salts is obtained; (2) nitrogen-doped graphene quantum dots are added into the organic solution of the metal halide salts and mixed uniformly, so that a precursor solution is obtained; (3) the precursor solution is dropwise added into an antiphase solvent and stirred so as to react completely, and centrifugation is conducted to remove a sediment, so that a CsPbBr3 perovskite nanocrystalline solution is obtained; and (4) the CsPbBr3 perovskite nanocrystalline solution and a polar solvent are mixed uniformly and extracted, so that the CsPbBr3 nanocrystalline dispersed in the polar solvent is obtained. The prepared nanocrystalline can be steadily dispersed in water or ethyl alcohol polar solvents, the problems that nanocrystalline prepared through a traditional method is prone to agglomerating when being stored, and the stability is poor are solved, and thestability of the CsPbBr3 nanocrystalline in a high humidity environment and the high polar solvent is improved.

Description

technical field [0001] The invention relates to a method for preparing all-inorganic perovskite nanocrystals, in particular to a stable and dispersed all-inorganic perovskite CsPbBr 3 Methods of preparing nanocrystals. Background technique [0002] In recent years, all-inorganic perovskite nanocrystals (CsPbX 3 ,X=Cl,Br,I) materials as a new type of nanocrystal system have attracted extensive attention from academia and industry. The characteristics of wavelength, synthesis method, and low cost make all-inorganic perovskite nanocrystalline materials one of the most competitive semiconductor materials in the field of optoelectronics. [0003] Although all-inorganic perovskite nanocrystal materials show good application prospects, all-inorganic nanocrystals belong to ionic crystals, and the bonding mode inside the crystal is chemical bonds, which leads to structural instability, mainly in: (1) During long-term storage, the crystals are easy to agglomerate to form larger par...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G21/00B82Y30/00B82Y40/00C09K11/66
CPCB82Y30/00B82Y40/00C01G21/006C09K11/665
Inventor 高辉薛志鹏李晓龙
Owner JIANGNAN UNIV
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