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Sonochemical preparation method for CsPbBr3 quantum dots

A technique for preparing cesium-lead-bromide perovskite and sonochemistry, which is applied in the field of information materials, can solve problems such as large organic waste liquid, complex operation, unfavorable quantum dot reaction kinetics, and achieve energy saving, simple reaction conditions, and excellent Effect of Optical Unity

Inactive Publication Date: 2017-12-01
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the mainstream synthesis method of cesium-lead-halogen quantum dots is the thermal injection method, but this method consumes a lot of energy, and the reaction produces a large amount of organic waste liquid. At the same time, the operation of the reaction process is complex and prone to human error, which is not conducive to the accurate study of the reaction in the quantum dot reaction process. dynamics problem

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  • Sonochemical preparation method for CsPbBr3 quantum dots
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  • Sonochemical preparation method for CsPbBr3 quantum dots

Examples

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Effect test

Embodiment 1

[0033] A kind of sonochemical synthesis of cesium lead bromide perovskite quantum dots (CsPbBr 3 ), the specific steps are as follows:

[0034] (1) Put 0.8gCs 2 CO 3 Dissolve in 30ml 1-octadecene, heat to 80℃ under nitrogen atmosphere, add 2.5ml oleic acid, wait for Cs 2 CO 3 After completely dissolved, cool to room temperature to obtain solution R 1 ;

[0035] (2) 0.132gPbBr 2 Dissolve in 10ml 1-octadecene, heat to 80℃ under nitrogen atmosphere, add 1ml oleic acid and 1ml oleylamine, wait for PbBr 2 After completely dissolved, cool to room temperature to obtain solution R 2 ;

[0036] (3) The liquid R obtained in the above steps (1) (2) 1 And R 2 Mix evenly according to the ratio of 1:10 to get R 3 . Mixed solution R 3 Transfer to a glass container, put it in an ultrasonic cleaning machine, and sonicate it with 250W power for 30min;

[0037] (4) Dissolve the liquid obtained in step (3) in toluene, centrifuge and wash with toluene 3 times, and finally disperse the solution in toluene ...

Embodiment 2

[0040] A kind of sonochemical synthesis of cesium lead bromide perovskite quantum dots (CsPbBr 3 ), the specific steps are as follows:

[0041] (1) Put 4g Cs 2 CO 3 Dissolve in 150ml 1-octadecene, heat to 80℃ under nitrogen atmosphere, add 12.5ml oleic acid, wait for Cs 2 CO 3 After completely dissolved, cool to room temperature to obtain solution R 1 ;

[0042] (2) Add 0.66g PbBr 2 Dissolved in 50ml 1-octadecene, in N 2 Heat to 80℃ in a gas atmosphere, add 5ml oleic acid and 5ml oleylamine, wait for PbBr 2 After completely dissolved, cool to room temperature to obtain solution R 2 ;

[0043] (3) The liquid R obtained in the above steps (1) (2) 1 And R 2 Mix evenly according to the ratio of 1:10 to get R 3 . Mixed solution R 3 Transfer to a glass container, put it in an ultrasonic cleaning machine, sonicate at 250W power for 60min;

[0044] (4) Dissolve the liquid obtained in step (3) in toluene, centrifuge and wash with toluene 3 times, and finally disperse the solution in toluene to...

Embodiment 3

[0047] A kind of sonochemical synthesis of cesium lead bromide perovskite quantum dots (CsPbBr 3 ), the specific steps are as follows:

[0048] (1) Put 0.8g Cs 2 CO 3 Dissolved in 30ml 1-octadecene, in N 2 Heat to 80°C under air atmosphere, add 2.5ml oleic acid, wait for Cs 2 CO 3 After completely dissolved, cool to room temperature to obtain solution R 1 ;

[0049] (2) 0.132gPbBr 2 Dissolved in 10ml 1-octadecene, in N 2 Heat to 80°C in an air atmosphere, add 1ml oleic acid and 1ml oleylamine, wait for PbBr 2 After completely dissolved, cool to room temperature to obtain solution R 2 ;

[0050] (3) The liquid R obtained in the above steps (1) (2) 1 And R 2 Mix evenly according to the ratio of 1:10 to get R 3 . Mixed solution R 3 Transfer to a glass container, put it in an ultrasonic cleaning machine, and sonicate it at 250W for 120min;

[0051] (4) Dissolve the liquid obtained in step (3) in toluene, centrifuge and wash with toluene 3 times, and finally disperse the solution in toluen...

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Abstract

The invention relates to a sonochemical preparation method for CsPbBr3 quantum dots. The method comprises the following steps: analytically pure Cs2CO3 is dissolved in a 1-octadecene and oleic acid mixed solution, and the solution is cooled to room temperature after Cs2CO3 is completely dissolved; analytically pure PbBr2 is dissolved in a 1-octadecene, oleic acid and oleylamine mixed solution, and the solution is cooled to room temperature after PbBr2 is completely dissolved; obtained precursor solutions are mixed uniformly and placed in an ultrasonic reactor for an ultrasonic reaction; a prepared solution is centrifugally washed three times with toluene, the solution is dissolved in toluene finally, and the CsPbBr3 quantum dot material is obtained. Compared with the traditional hot injection method, the CsPbBr3 quantum dot material prepared with sonochemical synthesis has the advantages that reaction conditions are simple, high temperature is not needed and energy is saved. The luminous range of the quantum dot material can be adjusted conveniently by controlling reaction time, and the quantum dots have excellent optical unicity.

Description

Technical field [0001] The invention belongs to the technical field of information materials, and specifically relates to a method for preparing cesium-lead bromide perovskite quantum dots by a sonochemical method. Background technique [0002] Quantum dots can also be called nanocrystals. Due to their unique quantum effects, they are widely used in many fields such as sensitized solar cells, photoluminescence, and photocatalysis. Cesium Lead Bromine Perovskite CsPbX 3 (X=Cl, Br, I) quantum dots have high fluorescence quantum efficiency (~90%), emission wavelength covering the entire visible spectrum (400~700nm), relatively narrow FWHM (12~42nm), etc. The advantages have attracted much attention, and these properties make it one of the most potential luminescent materials. [0003] The current mainstream cesium lead halide quantum dot synthesis method is heat injection, but this method consumes a lot of energy and produces a large amount of organic waste liquid. At the same time, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00
CPCC09K11/665B82Y20/00B82Y40/00
Inventor 邓兆赵珺江海圳高嘉瑞陈丽华李昱
Owner WUHAN UNIV OF TECH
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