Hexagonal-phase CsPbBr3 nanocrystalline and preparation method thereof

A technology of nanocrystals and hexagonal phases, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of not being suitable for application and promotion, and not obtaining large-volume hexagonal nanosheets, so as to avoid self-absorption effect, Ease of operation and excellent optical properties

Active Publication Date: 2019-12-20
SHANGHAI INST OF TECH
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  • 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-phase CsPbBr3 nanocrystalline and preparation method thereof
  • Hexagonal-phase CsPbBr3 nanocrystalline and preparation method thereof
  • Hexagonal-phase CsPbBr3 nanocrystalline and preparation method thereof

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Embodiment 1

[0037] A hexagonal CsPbBr 3 A method for preparing nanocrystals, comprising the steps of:

[0038] (1) Preparation of lead bromide precursor solution: Measure 1ml of oleylamine and 0.5ml of oleic acid in 10ml of DMF respectively, take 100mg of lead bromide powder in 8ml of DMF solution, and sonicate for 10min to obtain a uniformly dispersed solution. Then placed in a 50°C water bath and stirred for 10 min to dissolve.

[0039] (2) Preparation of cesium bromide precursor solution: Measure 1ml oleylamine and 0.5ml oleic acid respectively in 10ml absolute ethanol, take 60mg cesium bromide powder and place it in 10ml absolute ethanol solution, ultrasonic 10min, get Disperse the solution evenly, then place it in a 60°C water bath and stir for 30 minutes to dissolve.

[0040](3) Take 0.8ml lead bromide precursor solution and cesium bromide precursor solution at the same time, quickly inject into 5ml chloroform solution, stir continuously at 1200rmp / min for 60s, and let stand for 5...

Embodiment 2

[0043] (1) Preparation of lead bromide precursor solution: Measure 1ml of oleylamine and 0.5ml of oleic acid in 12ml of DMF respectively, take 120mg of lead bromide powder in 12ml of DMF solution, and sonicate for 10min to obtain a uniformly dispersed solution , and then placed in a 60°C water bath and stirred for 20 minutes to dissolve.

[0044] (2) Preparation of cesium bromide precursor solution: measure 1ml oleylamine respectively, place 0.5ml oleic acid in 12ml dehydrated ethanol, get 80mg cesium bromide powder and place it in 12ml dehydrated ethanol solution, ultrasonic 10min, obtain Disperse the solution evenly, then place it in a 70°C water bath and stir for 45 minutes to dissolve.

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

Embodiment 3

[0048] A hexagonal CsPbBr 3 A method for preparing nanocrystals, comprising the steps of:

[0049] (1) Preparation of lead bromide precursor solution: measure 1ml oleylamine and 0.5ml oleic acid respectively in 15ml DMF, take 140mg lead bromide powder and place it in 15ml DMF solution, ultrasonic 10min to obtain a uniformly dispersed solution , and then placed in a 70°C water bath and stirred for 30 minutes to dissolve.

[0050] (2) Preparation of cesium bromide precursor solution: measure 1ml oleylamine respectively, 0.5ml oleic acid is placed in 15ml absolute ethanol, take 85mg cesium bromide powder and place it in 15ml absolute ethanol solution, ultrasonic 10min, obtain Disperse the solution evenly, then place it in a 70°C water bath and stir for 60 minutes to dissolve.

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

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Abstract

The invention relates to a preparation method of hexagonal-phase CsPbBr3 nanocrystalline. The preparation method comprises the steps of uniformly dispersing lead bromide powder in an N, N-dimethylformamide solution, carrying out stirring under a water bath condition to completely dissolve the lead bromide powder to obtain a lead bromide precursor solution; uniformly dispersing cesium bromide powder in an absolute ethyl alcohol solution, and carrying out stirring under a water bath condition to completely dissolve the cesium bromide powder to obtain a cesium bromide precursor solution; and simultaneously injecting the lead bromide precursor solution and the cesium bromide precursor solution into a chloroform solution at room temperature under a stirring condition, standing after continuousstirring, and centrifugally separating solids in the product to obtain the hexagonal-phase CsPbBr3 nanocrystalline. The N, N-dimethylformamide solution is a mixed solution of oleylamine, oleic acid and N, N-dimethylformamide; and the absolute ethyl alcohol solution is a mixed solution of the oleylamine, the oleic acid and the absolute ethyl alcohol. Compared with the prior art, the preparation method has the advantages that the preparation method is simple to operate, the stoichiometric ratio of elements is controlled accurately, high-temperature or inert gas protection devices are not required, and the like.

Description

technical field [0001] The present invention relates to CsPbBr 3 The field of perovskite nanocrystalline luminescent materials, especially related to a hexagonal phase CsPbBr 3 Nanocrystals and methods for their preparation. Background technique [0002] In recent years, as a new member of the perovskite family—all-inorganic perovskite quantum dots have received a lot of attention due to their advantages such as very narrow luminescence peak, high quantum efficiency, good stability, simple preparation process, and adjustable color. increasing attention of researchers. Through the unremitting efforts of scientific researchers, all-inorganic perovskite quantum dots have been realized in various 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] Du...

Claims

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Application Information

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Patent Type & Authority Applications(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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