Preparation method of all-inorganic CsPbBr3 perovskite nanocrystal with controllable morphology

A nanocrystal and perovskite technology, applied in the field of inorganic nanoluminescent material preparation, can solve the problems of great influence on luminescence color, short lifespan of perovskite materials, poor material stability, etc., and achieves excellent optical properties, simple preparation method, The effect of easy availability of raw materials

Active Publication Date: 2020-05-29
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But just CsPbBr synthesized by simple thermal injection 3 Perovskite materials have short service life, the luminous color is greatly affected by halide ions, and the material itself has poor stability.

Method used

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  • Preparation method of all-inorganic CsPbBr3 perovskite nanocrystal with controllable morphology
  • Preparation method of all-inorganic CsPbBr3 perovskite nanocrystal with controllable morphology
  • Preparation method of all-inorganic CsPbBr3 perovskite nanocrystal with controllable morphology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Add 0.15g of cesium carbonate, 10ml of octadecene, and 0.5ml of oleic acid into a 50ml round-bottomed flask, heat up to 130°C under nitrogen protection, stir to make the whole solution clear and transparent, and set aside;

[0020] (2) Add 0.1g of lead bromide, 10ml of octadecene, 1ml of oleylamine, and 0.5ml of 5-hexynoic acid into a 50ml round bottom flask, raise the temperature to 100°C under the protection of nitrogen, keep stirring for 20min to ensure that the solid The drug is completely dissolved, and then continue to heat up to 140°C, take 0.8ml of the solution obtained in step (1) and quickly inject it into it, stir and react for 10 seconds, and then cool to room temperature with an ice-water bath;

[0021] (3) Add the cooled stock solution into a 50ml centrifuge tube, add 10ml of absolute ethanol to it for washing and ultrasonication for 1min to make the solution uniform, then put it in a centrifuge and centrifuge at 10,000 rpm for 5 minutes, discard the su...

Embodiment 2

[0024] (1) Add 0.2g of cesium carbonate, 10ml of octadecene, and 1ml of oleic acid into a 50ml round-bottomed flask, heat up to 140°C under the protection of nitrogen, stir to make the whole solution clear and transparent, and set aside;

[0025] (2) Add 0.2g of lead bromide, 15ml of octadecene, 2ml of oleylamine, and 1ml of 5-hexynoic acid into a 50ml round-bottom flask, raise the temperature to 110°C under the protection of nitrogen, and keep stirring for 30min to ensure that the solid drug Dissolve it completely, then continue to heat up to 155°C, take 1.2ml of the solution obtained in step (1) and quickly inject it into it, stir and react for 7s, then cool to room temperature with an ice-water bath;

[0026] (3) Add the cooled stock solution into a 50ml centrifuge tube, add 15ml of absolute ethanol to it for washing and ultrasonication for 2 minutes to make the solution uniform, then put it in a centrifuge and centrifuge at 8000 rpm for 5 minutes, discard the supernatant s...

Embodiment 3

[0029] (1) Add 0.25g cesium carbonate, 15ml octadecene, and 1.5ml oleic acid into a 50ml round-bottomed flask, heat up to 150°C under nitrogen protection, stir to make all dissolves clear and transparent, and set aside;

[0030] (2) Add 0.3g of lead bromide, 20ml of octadecene, 3ml of oleylamine, and 1.5ml of 5-hexynoic acid into a 50ml round bottom flask, raise the temperature to 120°C under the protection of nitrogen, and keep stirring for 40min to ensure that the solid The drug is completely dissolved, and then continue to heat up to 170°C, take 1.2ml of the solution obtained in step (1) and quickly inject it into it, stir and react for 5 seconds, and then cool to room temperature with an ice-water bath;

[0031] (3) Add the cooled stock solution into a 50ml centrifuge tube, add 20ml of absolute ethanol to it for washing and ultrasonication for 3 minutes to make the solution uniform, then put it in a centrifuge and centrifuge at 8000 rpm for 5 minutes, discard the supernatan...

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Abstract

The invention relates to a preparation method of an all-inorganic CsPbBr3 perovskite nanocrystal with controllable morphology, and belongs to the technical field of preparation of inorganic nano luminescent materials. Specifically, a thermal injection method commonly used for synthesizing perovskite is adopted, and the innovation point is that 5-hexynoic acid is used as a surface ligand to passivate a product when the material is prepared. The morphology of the CsPbBr3 perovskite is regulated and controlled by controlling the use amount and the synthesis temperature of the ligand, and the method has the advantages of being rapid in synthesis, easy and convenient to operate and high in repeatability and is a reliable method for synthesizing the perovskite nano material. By regulating and controlling the morphology of the CsPbBr3 perovskite nanocrystal, carefully controlled emission of light with different wavelengths and high brightness can be realized under excitation. The CsPbBr3 perovskite nanocrystal has a wide application prospect in the aspects of LED lamps, screen display and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nano-luminescent materials, and in particular relates to an all-inorganic CsPbBr 3 A method for the preparation of perovskite nanocrystals with controllable morphology. Background technique [0002] All-inorganic halide perovskite material, the general molecular formula is ABX 3 (Here A is the metal Cs, B is the heavy metal Pb, X is the halogens Cl, Br, I), since it was first reported in 2015, due to its high quantum yield, narrow half-peak width, and the different halide ions can realize The luminescent color is tunable in the visible region and has become a promising luminescent material. Now, the application of all-inorganic halide perovskite materials in the field of optoelectronics has developed rapidly. Due to its high external quantum efficiency, it has been widely studied in solar cells, and its efficiency has caught up with traditional solar cells. It was a huge succes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/00C09K11/66B82Y20/00B82Y40/00
CPCC01G21/006C09K11/665B82Y20/00B82Y40/00C01P2002/34C01P2004/38C01P2004/39
Inventor 李红波刘向东英起飞魏阳黄岭
Owner NANJING UNIV OF TECH
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