Environment-friendly method for ultrasonically synthesizing CsPbBr3 nano-crystals with different structures

A technology of ultrasonic synthesis and nanocrystals, applied in nanotechnology, chemical instruments and methods, luminescent materials, etc., can solve the problems of easy damage to the crystal structure, pollution of the environment, etc., and achieve the effects of wide application prospects, cheap raw materials, and high fluorescence efficiency

Active Publication Date: 2018-03-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, most of the synthetic CsPbBr 3 All methods use N-N dimethylformamide, 1-octadecene, acetone, toluene, chloroform and other solvents in large quantities, which not only easily destroys the crystal structure, but also pollutes the environment, which limits its further application.

Method used

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  • Environment-friendly method for ultrasonically synthesizing CsPbBr3 nano-crystals with different structures
  • Environment-friendly method for ultrasonically synthesizing CsPbBr3 nano-crystals with different structures
  • Environment-friendly method for ultrasonically synthesizing CsPbBr3 nano-crystals with different structures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Green Ultrasonic Preparation of CsPbBr 3 The nanocrystal solution specifically comprises the following steps:

[0033] (1) Add 0.1mmol of Cs 2 CO 3 and 0.2 mmol PbBr 2 Add to 1ml of liquid paraffin, then drop in 0.9ml of oleic acid and 0.1ml of oleylamine to obtain a pale yellow mixed solution;

[0034] (2) Place the light yellow mixed solution in step (1) in a contact ultrasonic machine, set the cycle curve of ultrasonication for 1 min and stop for 5 s, the total ultrasonic time is 30 min, and the ultrasonic power is 90W, to obtain a green mixed solution;

[0035] (3) Centrifuge the green mixed solution of step (2) directly at 5000 rpm for 20 min, pour off the supernatant, and then redisperse the precipitate in toluene to obtain crude CsPbBr 3 nanocrystal solution;

[0036] (4) The crude CsPbBr obtained in step (3) 3 The nanocrystal solution was centrifuged again at 8000 rpm for 10 min, and then the precipitate was redispersed in toluene to obtain more pure CsPbB...

Embodiment 2

[0039] Green Ultrasonic Preparation of CsPbBr 3 The nanocrystal solution specifically comprises the following steps:

[0040] (1) Add 0.1mmol of Cs 2 CO 3 and 0.5 mmol PbBr 2 Add to 5ml of liquid paraffin, then drop in 0.5ml of oleic acid and 0.5ml of oleylamine to obtain a mixed solution;

[0041] (2) Put the mixed solution in step (1) in a contact ultrasonic machine, set the cycle curve of ultrasonic for 1 min and stop for 5 s, the total ultrasonic time is 60 min, and the ultrasonic power is 90W, to obtain a green mixed solution;

[0042] (3) Centrifuge the green mixed solution of step (2) directly at 8000 rpm for 10 min, pour off the supernatant, and then redisperse the precipitate in toluene to obtain crude CsPbBr 3 nanocrystal solution;

[0043] (4) The crude CsPbBr obtained in step (3) 3 The nanocrystal solution was centrifuged again at 10,000 rpm for 10 min, and then the precipitate was redispersed in toluene to obtain more pure CsPbBr 3 nanocrystals.

[0044] Pre...

Embodiment 3

[0046] Green Ultrasonic Preparation of CsPbBr 3 The nanocrystal solution specifically comprises the following steps:

[0047] (1) Add 0.1mmol of Cs 2 CO 3 and 0.2 mmol PbBr 2 Add to 10ml of liquid paraffin, then drop in 0.1ml of oleic acid and 1.0ml of oleylamine to obtain a mixed solution;

[0048] (2) Put the mixed solution in step (1) in a contact ultrasonic machine, set the cycle curve of ultrasonic for 1 min and stop for 5 s, the total ultrasonic time is 30 min, and the ultrasonic power is 200W, to obtain a green mixed solution;

[0049] (3) Centrifuge the green mixed solution in step (2) directly at 8000 rpm for 20 min, pour off the supernatant, and then redisperse the precipitate in toluene to obtain crude CsPbBr 3 nanocrystal solution;

[0050] (4) The crude CsPbBr obtained in step (3) 3 The nanocrystal solution was centrifuged again at 12000 rpm for 5min, and then the precipitate was redispersed in toluene for storage to obtain more pure CsPbBr 3 nanocrystals. ...

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Abstract

The invention discloses an environment-friendly method for ultrasonically synthesizing CsPbBr3 nano-crystals with different structures. The method comprises the steps of adding Cs2CO3, PbBr2, oleic acid and oleylamine into liquid paraffin, carrying out ultrasonic and uniform dispersion, carrying out centrifugation to obtain precipitates, dissolving the precipitates into an organic solvent, carrying out centrifugation again, and putting the obtained precipitates into an organic solvent again for storage, so as to obtain the CsPbBr3 nano-crystals. The method is simple in process, and no surfacefinishing agent or toxic solvent are added, so that the method is environmentally friendly and efficient; by controlling the proportion of oleic acid to oleylamine and the ultrasonic power, the structures of the synthesized CsPbBr3 nano-crystals are controlled, and the CsPbBr3 nano-crystals with different structures can be prepared; and meanwhile, the CsPbBr3 nano-crystals have high stability andfluorescence efficiency and do not quench at a high temperature for a long time and have wide application prospects.

Description

technical field [0001] The present invention relates to CsPbBr 3 The field of nanocrystal synthesis, specifically related to a green ultrasonic synthesis of CsPbBr with different structures 3 nanocrystal approach. Background technique [0002] In recent years, due to the advantages of narrow emission spectrum, wide adjustable wavelength range, high fluorescence efficiency, strong photochemical stability and easy surface modification, quantum dots with perovskite structure have attracted great attention. Photoelectric sensors, solar cells, lasers and other fields have shown great development prospects. Organic-inorganic hybrid CH 3 NH 3 wxya 3 (X = Cl, Br, I) and the all-inorganic CsPbX 3 (X = Cl, Br, I) is the current focus of research on perovskite quantum dots. [0003] Due to CH 3 NH 3 PbCl 3 Quantum dot synthesis method is relatively complex, CH 3 NH 3 PB 3 Quantum dots are relatively poor in air stability, so the most reported in the literature is CH 3 N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/16B82Y40/00C09K11/66
CPCB82Y40/00C01G21/16C01P2002/80C01P2002/84C01P2004/04C09K11/665
Inventor 饶龙石汤勇李宗涛颜才满卢汉光李家声
Owner SOUTH CHINA UNIV OF TECH
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