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hexagonal cspbbr 3 Nanocrystal and its preparation method

A technology of nanocrystals and hexagonal phases, applied in the direction of nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems that are not suitable for application and promotion, and have not obtained large-volume hexagonal nanosheets, so as to achieve easy and repeatable operation High performance and excellent optical properties

Active Publication Date: 2022-06-24
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are many synthesis methods of cesium lead halide perovskite quantum dots. In 2016, Professor Zeng Haibo synthesized a square CsPbBr of about 10nm at room temperature. 3 Quantum dots (Adv.Funct.Mater.2016,26,2435), but did not obtain large-volume hexagonal nanosheets
In addition, researchers have also obtained large-volume square nanosheets by chemical vapor deposition (Adv. Not suitable for app promotion

Method used

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  • hexagonal cspbbr <sub>3</sub> Nanocrystal and its preparation method
  • hexagonal cspbbr <sub>3</sub> Nanocrystal and its preparation method
  • hexagonal cspbbr <sub>3</sub> Nanocrystal and its preparation method

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Effect test

Embodiment 1

[0037] A hexagonal CsPbBr 3 The preparation method of nanocrystal comprises the following steps:

[0038] (1) Preparation of lead bromide precursor solution: respectively measure 1ml oleylamine, 0.5ml oleic acid and place in 10ml DMF, take 100mg lead bromide powder and place it in 8ml DMF solution, ultrasonically for 10min to obtain a uniformly dispersed solution , and then placed in a 50 ℃ water bath and stirred for 10 min to dissolve.

[0039] (2) preparation of cesium bromide precursor solution: measure 1ml oleylamine respectively, 0.5ml oleic acid is placed in 10ml absolute ethanol, get 60mg cesium bromide powder and be placed in 10ml absolute ethanol solution, ultrasonic 10min, obtain The uniformly dispersed solution was then placed in a 60°C water bath and stirred for 30min to dissolve.

[0040](3) Take 0.8 ml of lead bromide precursor solution and cesium bromide precursor solution at the same time, quickly inject into 5 ml of chloroform solution, continue stirring at ...

Embodiment 2

[0043] (1) preparation of lead bromide precursor solution: measure 1ml oleylamine respectively, 0.5ml oleic acid is placed in 12ml DMF, get 120mg lead bromide powder and be placed in 12ml DMF solution, ultrasonic 10min, obtains dispersed solution. , and then placed in a 60 ℃ water bath and stirred for 20 min to dissolve.

[0044] (2) preparation of cesium bromide precursor solution: measure 1ml oleylamine respectively, 0.5ml oleic acid is placed in 12ml dehydrated alcohol, get 80mg cesium bromide powder and place in 12ml dehydrated alcohol solution, ultrasonic 10min, obtain The uniformly dispersed solution was then placed in a 70°C water bath and stirred for 45min to dissolve.

[0045] (3) Take 1.0 ml of lead bromide precursor solution and cesium bromide precursor solution at the same time, quickly inject into 10 ml of chloroform solution, continue stirring at 800 rmp / min for 60 s, and let stand for 8 days. The final product obtained by centrifugation at 6000 rpm / min is the h...

Embodiment 3

[0048] A hexagonal CsPbBr 3 The preparation method of nanocrystal comprises the following steps:

[0049] (1) preparation of lead bromide precursor solution: measure 1ml oleylamine respectively, 0.5ml oleic acid is placed in 15ml DMF, get 140mg lead bromide powder and be placed in 15ml DMF solution, ultrasonic 10min, obtains dispersed solution. , and then placed in a 70°C water bath and stirred for 30min to dissolve.

[0050] (2) preparation of cesium bromide precursor solution: measure 1ml oleylamine respectively, 0.5ml oleic acid is placed in 15ml dehydrated alcohol, get 85mg cesium bromide powder and place in 15ml dehydrated alcohol solution, ultrasonic 10min, obtain The uniformly dispersed solution was then placed in a 70°C water bath and stirred for 60min to dissolve.

[0051] (3) Take 1.2 ml of the lead bromide precursor solution and the cesium bromide precursor solution at the same time, quickly inject them into 10 ml of chloroform solution, continue stirring for 60 s...

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Abstract

The invention relates to a hexagonal phase CsPbBr 3 The preparation method of the nanocrystal comprises uniformly dispersing the lead bromide powder in the N,N-dimethylformamide solution, stirring under the water bath condition to completely dissolve the lead bromide powder to obtain the lead bromide precursor solution; the cesium bromide powder Uniformly disperse in absolute ethanol solution, stir under water bath conditions to completely dissolve cesium bromide powder to obtain cesium bromide precursor solution; inject lead bromide precursor solution and cesium bromide precursor solution at the same time under room temperature and stirring conditions Chloroform solution, after continuous stirring, let it stand for treatment, and centrifuge the solid in the product to obtain the hexagonal phase CsPbBr 3 Nanocrystalline; N,N-dimethylformamide solution is a mixed solution of oleylamine, oleic acid and N,N-dimethylformamide; absolute ethanol solution is a mixed solution of oleylamine, oleic acid and absolute ethanol . Compared with the prior art, the invention has the advantages of simple operation, accurate control of element stoichiometric ratio, no need of high temperature or inert gas protection device and the like.

Description

technical field [0001] The present invention relates to CsPbBr 3 The field of perovskite nanocrystalline light-emitting materials, especially a hexagonal phase CsPbBr 3 Nanocrystals and preparation methods thereof. Background technique [0002] In recent years, as a new member of the perovskite family, all-inorganic perovskite quantum dots have received much attention due to their very narrow luminescence peak, high quantum efficiency, good stability, simple preparation process, and tunable color. increasing attention of researchers. Through the unremitting efforts of researchers, all-inorganic perovskite quantum dots have achieved many applications such as solar cells, light-emitting diodes (LEDs), white light LEDs (WLEDs), and lasers. With the deepening of scientific research, it is believed that all-inorganic perovskite quantum dots will become the core of a new generation of optoelectronic materials. [0003] Due to the advantages of easy synthesis, low cost, high ab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G21/00C09K11/66B82Y30/00
CPCC01G21/006C09K11/665B82Y30/00C01P2004/03C01P2004/64
Inventor 房永征陈鹏刘玉峰房诗玉杨永阁张娜赵国营侯京山
Owner SHANGHAI INST OF TECH
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