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A preparation method of binary ligand modified perovskite cspbx3 quantum dots

A perovskite, quantum dot technology, applied in chemical instruments and methods, nanotechnology for materials and surface science, luminescent materials, etc., can solve problems affecting device performance, etc., to increase mobility, reduce resistance, Reduce the effect of coffee ring effect

Active Publication Date: 2021-04-13
合肥净龙环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because quantum dots are coated with organic ligands, the migration of carriers in optoelectronic devices is affected by these ligands, which greatly affects the performance of the device.

Method used

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  • A preparation method of binary ligand modified perovskite cspbx3 quantum dots
  • A preparation method of binary ligand modified perovskite cspbx3 quantum dots
  • A preparation method of binary ligand modified perovskite cspbx3 quantum dots

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Embodiment 1

[0022] Preparation of Oxalic Acid and Hexamethylenediamine Modified CsPbBr 3 Perovskite Quantum Dots

[0023] 1. Mix 0.2mmol of CsBr and 0.2mmol of PbBr 2 Add in the flask, then add 5ml of N,N-dimethylformamide (DMF) as a solvent, 0.25ml of oxalic acid and 0.25ml of hexamethylenediamine as a stabilizer, heat and stir until it dissolves to form a CsPbBr-containing 3 Clear solution.

[0024] 2. Inject the formed clear solution into a stirred flask with toluene. At this time, the cesium, lead, and halogen ions dissolved in the DMF solution are supersaturated and precipitated due to a sharp drop in solubility in the mixed solvent, forming CsPbBr 3 Perovskite quantum dots, while oxalic acid and hexamethylenediamine as ligands coated on CsPbBr 3 Perovskite quantum dot surface.

Embodiment 2

[0026] Preparation of pimelic acid and hexamethylenediamine modified CsPbBr 1 I 2 quantum dot

[0027] 1. Mix 0.2mmol of CsBr and 0.2mmol of PbI 2 Add in the flask, then add 5ml of N,N-dimethylformamide (DMF) as a solvent, 0.25ml of pimelic acid and 0.25ml of hexamethylenediamine as a stabilizer, heat and stir until it dissolves to form a CsPbBr-containing 1 I 2 Clear solution.

[0028] 2. Inject the formed clear solution into a stirred flask with toluene. At this time, the cesium, lead, and halogen ions dissolved in the DMF solution are supersaturated and precipitated due to a sharp drop in solubility in the mixed solvent, forming CsPbBr 1 I 2 Perovskite quantum dots, while pimelic acid and hexamethylenediamine as ligands coated on CsPbBr 1 I 2 Perovskite quantum dot surface.

Embodiment 3

[0030] Preparation of Suberic Acid and Octanediamine Modified CsPbI 3 Perovskite Quantum Dots

[0031] 1. Mix 0.2mmol of CsI and 0.2mmol of PbI 2 Add in the flask, then add 5ml of dimethyl sulfoxide (DMSO) as a solvent, 0.25ml of suberic acid and 0.25ml of octanediamine as a stabilizer, heat and stir until it dissolves to form a clear solution.

[0032] 2. Inject the formed clear solution into a stirred flask with toluene. At this time, cesium, lead, and halogen ions dissolved in the DMSO solution are supersaturated and precipitated due to a sharp drop in solubility in the mixed solvent, forming CsPbI 3 Perovskite quantum dots, while suberic acid and octanediamine as ligands coated on CsPbI 3 Perovskite quantum dot surface.

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Abstract

The invention discloses a binary ligand modified perovskite CsPbX 3 The preparation method of quantum dots, the characteristics of the present invention are: dissolving cesium, lead and bromine in the solvent in the form of ions, adding an appropriate amount of dicarboxylic acids and diamines as stabilizers; using room temperature recrystallization method to form CsPbX with binary ligand modification 3 Perovskite quantum dots. The advantage of this invention is that the quantum dots modified by binary ligands can form a structure similar to aggregation between the quantum dots, and connect the quantum dots to each other, which can reduce the distance between the quantum dots after forming a film, which is relatively The distance between the quantum dots can be reduced by half compared with the single ligand, which increases the mobility of the carriers. The transport rate of perovskite quantum dots in the device can be improved, and at the same time, the obtained perovskite quantum dot solution has higher viscosity, making it more suitable for ink preparation for inkjet printing.

Description

technical field [0001] The invention relates to the technical field of nanomaterials for photoelectric display lighting, in particular to a binary ligand modified perovskite CsPbX 3 Preparation methods of quantum dots. Background technique [0002] Quantum dots, also known as nanocrystals, consist of an inorganic core composed of hundreds to thousands of atoms, covered with organic ligands, and the particle size is usually 2-15nm. Since quantum dots can controllably adjust their emission spectrum by adjusting the size, the spectral emission of the entire visible light region can be obtained by changing the size and chemical composition of quantum dots. Show great potential and application value. [0003] CaB 3 Perovskite quantum dots, as a new type of semiconductor nanomaterial, have shown great application potential in various optoelectronic devices due to their excellent optoelectronic properties. Since quantum dots are coated with organic ligands, the migration of car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/06C09K11/66B82Y30/00
CPCB82Y30/00C09K11/06C09K11/665
Inventor 曹万强陈甘霖方凡张蕾刘培朝潘一路王仁龙梅明李阳张阮
Owner 合肥净龙环保科技有限公司