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A shape-controllable all-inorganic cspbbr 3 Preparation method of perovskite nanocrystals

A technology of nanocrystals and perovskite, which is applied in the field of preparation of inorganic nanoluminescent materials, can solve the problems of perovskite materials such as short life, poor material stability, and great influence on luminescent color, and achieve simple preparation methods, easy-to-obtain raw materials, The effect of excellent optical properties

Active Publication Date: 2022-03-25
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A shape-controllable all-inorganic cspbbr <sub>3</sub> Preparation method of perovskite nanocrystals
  • A shape-controllable all-inorganic cspbbr <sub>3</sub> Preparation method of perovskite nanocrystals
  • A shape-controllable all-inorganic cspbbr <sub>3</sub> Preparation method of perovskite nanocrystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) 0.15g of cesium carbonate, 10ml of octadecene, and 0.5ml of oleic acid were added to a 50ml round-bottomed flask, and the temperature was raised to 130° C. under nitrogen protection, and stirred to make all dissolved to be clear and transparent, for subsequent use;

[0020] (2) 0.1g of lead bromide, 10ml of octadecene, 1ml of oleylamine, 0.5ml of 5-hexynoic acid were added to a 50ml round-bottomed flask, heated to 100°C under nitrogen protection, stirred and maintained at a constant temperature for 20min to ensure solid All the medicines were dissolved, then the temperature was continued to rise to 140°C, 0.8 ml of the solution obtained in step (1) was quickly injected into it, and the reaction was stirred for 10s, and then cooled 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 wash and ultrasonicate for 1min to make the solution uniform, then put it into a centrifuge ...

Embodiment 2

[0024] (1) 0.2g of cesium carbonate, 10ml of octadecene, and 1ml of oleic acid were added to a 50ml round-bottomed flask, and the temperature was raised to 140° C. under nitrogen protection, and stirred to make all dissolved to be clear and transparent, for subsequent use;

[0025] (2) 0.2g of lead bromide, 15ml of octadecene, 2ml of oleylamine, and 1ml of 5-hexynoic acid were added to a 50ml round-bottomed flask, heated to 110°C under nitrogen protection, stirred and maintained at a constant temperature for 30min to ensure solid medicine All dissolved, then continue to heat up to 155 ° C, take 1.2 ml of the solution obtained in step (1) and quickly inject it into it, stir and react for 7 s and 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 wash it and ultrasonicate for 2min to make the solution uniform, then put it into a centrifuge and centrifuge at 8000 rpm for 5 mi...

Embodiment 3

[0029] (1) 0.25g of cesium carbonate, 15ml of octadecene, and 1.5ml of oleic acid were added to a 50ml round-bottomed flask, and the temperature was raised to 150° C. under nitrogen protection, and stirred to make all dissolved to be clear and transparent, for subsequent use;

[0030] (2) 0.3g of lead bromide, 20ml of octadecene, 3ml of oleylamine, and 1.5ml of 5-hexynoic acid were added to a 50ml round-bottomed flask, heated to 120°C under nitrogen protection, stirred and maintained at a constant temperature for 40min to ensure solid All the medicines were dissolved, then the temperature was continued to rise to 170°C, 1.2 ml of the solution obtained in step (1) was quickly injected into it, stirred and reacted for 5s, and then cooled 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 wash and ultrasonicate for 3min to make the solution uniform, then put it into a centrifuge and ce...

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Abstract

The invention relates to a shape-controllable all-inorganic CsPbBr 3 The invention discloses a method for preparing perovskite nano crystals, which belongs to the technical field of preparation of inorganic nano light-emitting materials. Specifically, the thermal injection method commonly used in the synthesis of perovskite is adopted, and the innovation is that 5-hexynoic acid is used as a surface ligand to passivate the product when preparing the material. The present invention realizes CsPbBr by controlling the use amount and synthesis temperature of this ligand 3 The morphology control of perovskite has the advantages of rapid synthesis, easy operation and high reproducibility, and it is a reliable method for the synthesis of perovskite nanomaterials. By regulating CsPbBr 3 The morphology of perovskite nanocrystals can be carefully controlled to emit light of different wavelengths and high brightness under excitation. It has broad application prospects in LED lights and screen displays.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nano-luminescent materials, in particular 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 formula is ABX 3 (here A is metal Cs, B is heavy metal Pb, X is halogen Cl, Br, I), since it was first reported in 2015, due to its high quantum yield, narrow half-peak width, and can be achieved depending on the halide ion The luminescent color is tunable in the visible light region and has become a promising luminescent material. Now, the application of all-inorganic halide perovskite materials in the field of optoelectronics has been rapidly developed. 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. With great success, it became a rising...

Claims

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Application Information

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Patent Type & Authority Patents(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 TECH UNIV
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