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Method for synthesizing CsPbBr3 nanocrystal through centrifugal stirring

A technology of nano crystals and centrifuges, applied in the direction of nanotechnology, chemical instruments and methods, luminescent materials, etc., can solve the problems of hidden safety hazards for operators and users, and achieve the effects of convenient operation, industrial production, and cheap raw materials

Inactive Publication Date: 2018-03-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the preparation of CsPbX by the method reported in the literature above 3 For quantum dots, the amount of ligand needs to be precisely controlled, and toxic solvents such as toluene, chloroform or hexane need to be used, which poses a great safety hazard to operators and users

Method used

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  • Method for synthesizing CsPbBr3 nanocrystal through centrifugal stirring
  • Method for synthesizing CsPbBr3 nanocrystal through centrifugal stirring
  • Method for synthesizing CsPbBr3 nanocrystal through centrifugal stirring

Examples

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Effect test

Embodiment 1

[0025] A Centrifugal Stirring Synthesis of CsPbBr 3 The method for nanocrystals specifically comprises the following steps:

[0026] (1) CsBr and PbBr with a molar ratio of 1:1 2 (total weight 1 g) was dissolved in 2 ml of DMSO to obtain a mixed solution of 0.5 g / ml;

[0027] (2) Place the mixed solution obtained in step (1) in a high-speed centrifuge, centrifuge for 5 hours at a speed of 900rpm, and make the CsBr and PbBr in the mixed solution 2 Dissolve, let stand for 30 minutes after centrifugation, pour off the supernatant, then inject 0.5 ml of DMSO to wash once, and then introduce the washed solution into a conical funnel (covered with two layers of filter paper);

[0028] (3) The conical funnel in step (2) was placed in an oven, baked at 100°C, vacuumed at 1 MPa, baked for 10 h, and finally cooled to room temperature to obtain CsPbBr 3 Nanocrystalline powder.

[0029] Synthetic-CsPbBr 3 Scanning electron microscope (SEM) images of nanocrystals at different magnific...

Embodiment 2

[0033] A Centrifugal Stirring Synthesis of CsPbBr 3 The method for nanocrystals specifically comprises the following steps:

[0034] (1) CsBr and PbBr with a molar ratio of 5:1 2 (total weight 2 g) was dissolved in 1 ml of DMSO to obtain a mixed solution of 2 g / ml;

[0035] (2) Place the mixed solution obtained in step (1) in a high-speed centrifuge and centrifuge for 3 hours at a speed of 2000 rpm to make the CsBr and PbBr in the mixed solution 2 Dissolve, let stand for 50 minutes after centrifugation, pour off the supernatant, then inject 1 ml of DMSO to wash 3 times, and then introduce the washed solution into a conical funnel (covered with two layers of filter paper);

[0036] (3) Put the conical funnel in step (2) into the oven, bake at 120°C, vacuum at 0.5MPa, bake for 5 hours, and finally cool to room temperature to obtain CsPbBr 3 Nanocrystalline powder.

[0037] The synthesized CsPbBr 3 Nanocrystals were mixed with PDMS to obtain a film with a diameter of 3 mm an...

Embodiment 3

[0039] A Centrifugal Stirring Synthesis of CsPbBr 3 The method for nanocrystals specifically comprises the following steps:

[0040] (1) CsBr and PbBr with a molar ratio of 10:1 2 (total weight 3 g) was dissolved in 1 ml of DMSO to obtain a mixed solution of 3 g / ml;

[0041] (2) Place the mixed solution obtained in step (1) in a high-speed centrifuge and centrifuge for 5 hours at a speed of 1000 rpm to make the CsBr and PbBr in the mixed solution 2 Dissolve, let stand for 60 minutes after centrifugation, pour off the supernatant, then inject 0.5 ml of DMSO to wash 5 times, and then introduce the washed solution into a conical funnel (spread with two layers of filter paper);

[0042](3) Put the conical funnel in step (2) into the oven, bake at 150°C, vacuum at 1 MPa, bake for 2 hours, and finally cool to room temperature to obtain CsPbBr 3 Nanocrystalline powder.

[0043] The synthesized CsPbBr 3 Nanocrystals were mixed with PDMS to obtain a film with a diameter of 3mm and...

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Abstract

The invention discloses a method for synthesizing CsPbBr3 nanocrystal through centrifugal stirring. The method comprises the following steps: dissolving cesium bromide and lead bromide into dimethyl sulfoxide, then transferring to a centrifuge for centrifugation, standing after completion of the centrifugation, removing a supernatant, washing the dimethyl sulfoxide, filtering, and performing vacuum drying to obtain CsPbBr3 nanocrystal powder. The CsPbBr3 nanocrystal synthesized by the method provided by the invention has high fluorescence efficiency, can be unquenched for a long time at high temperature, has a wide application prospect; meanwhile, by the method provided by the invention, a technology is simple, any surface modifier and any toxic solvent are added, environment friendlinessis achieved, raw materials are cheap, operation is convenient, the efficiency is high, and industrial production is facilitated.

Description

technical field [0001] The present invention relates to CsPbBr 3 The field of nanocrystal synthesis, specifically related to a centrifugal stirring synthesis of CsPbBr 3 nanocrystal approach. Background technique [0002] In recent years, halogen perovskite nanocrystals have been widely used in light-emitting diodes, solar cells, displays, lasers and other fields due to their advantages such as narrow emission spectrum, high fluorescence efficiency, strong stability and easy surface modification. [0003] Currently synthesized CsPbBr 3 Nanocrystals mainly adopt the ligand-assisted precipitation method or supersaturated recrystallization method, that is, the nanocrystals are precipitated through the different solubility of the precursor in different solvents, and then adding surface ligands helps to dissolve and maintain the stability of the nanocrystals, and can also control The size and shape of nanocrystals can be adjusted to obtain quantum dot materials with adjustable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/16B82Y40/00C09K11/66
CPCC01G21/16B82Y40/00C01P2002/72C01P2002/80C01P2002/84C01P2004/03C01P2004/61C01P2006/60C09K11/665
Inventor 饶龙石汤勇李宗涛颜才满余树东杜学威
Owner SOUTH CHINA UNIV OF TECH
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