Perovskite quantum dot ligand and preparation method and application thereof

A quantum dot and perovskite technology, applied in the field of semiconductor light-emitting materials, can solve the problems of destroying the crystal structure and luminescent properties of perovskite quantum dots, and achieve the effects of simple preparation method, improved stability and convenient operation.

Inactive Publication Date: 2019-07-23
SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a perovskite quantum dot ligand and a preparation method thereof, aiming at solving the problem that the perovskite quantum dots prepared in the prior art are easily damaged by water, oxygen, etc. in the use environment. Problems with structure and luminescent properties

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  • Perovskite quantum dot ligand and preparation method and application thereof
  • Perovskite quantum dot ligand and preparation method and application thereof
  • Perovskite quantum dot ligand and preparation method and application thereof

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preparation example Construction

[0034] Correspondingly, the above-mentioned acrylate-based quaternary ammonium salt ligand is prepared by the following preparation method, which includes the following steps:

[0035] G01. Weigh and mix acrylate, haloalkane, and polymerization inhibitor to obtain the first mixture; wherein, the acrylate is R 1 OOCC 2 h 4 , the haloalkane is R 2 X, where R1 It is a short-chain hydrocarbon group with 2 to 4 carbon atoms, R 2 It is a long-chain hydrocarbon group with 8 to 18 carbon atoms, and X is a halogen atom; the first mixture is subjected to constant temperature heating and stirring reaction, and is cooled after 12 to 36 hours of reaction;

[0036] G02. Add anhydrous ether to wash the product obtained by the reaction, and collect the crude product; add acetone solution to the crude product to dissolve in saturation, cool and crystallize at a temperature of 0°C to 4°C, collect the crystals, and dry them to obtain Acrylate-based quaternary ammonium ligand.

[0037] Speci...

Embodiment 1

[0066] A green light-emitting perovskite quantum dot dispersion liquid coated with organic polymer.

[0067] The preparation method of the acrylate-based quaternary ammonium salt ligand is: add 50mmol (16.6695g) BODA and 50mmol (7.15g) DEA into a 100ml flask, then add 5wt% polymerization inhibitor phenothiazine, stir and heat at 50°C for 24h , after cooling, add anhydrous ether to wash 3 times to remove unreacted monomer, then saturate and dissolve it with acetone, put it in the refrigerator to cool and recrystallize, and dry it in a vacuum oven at 25°C for 24 hours to obtain a white solid powder, which is acrylate Ligands for quaternary ammonium ligands.

[0068] The preparation method of composite perovskite quantum dots coated with acrylate-based quaternary ammonium ligands on the surface is as follows: 0.07mmol CsBr, 0.1mmol PbBr2, 0,03mmol ligands are dissolved in 1ml dimethyl sulfoxide, dropwise into 20ml vigorous Add 1ml of acetonitrile, centrifuge at 10000rpm for 10mi...

Embodiment 2

[0070] A blue light-emitting perovskite quantum dot dispersion liquid coated with organic polymer.

[0071] The preparation method of the acrylate-based quaternary ammonium salt ligand is: add 50mmol (16.6695g) BODA and 50mmol (7.15g) DEA to a 100ml flask, then add 5wt% polymerization inhibitor phenothiazine, stir and heat at 50°C for 24h, After cooling, add anhydrous ether to wash 3 times to remove unreacted monomers, then saturate and dissolve them with acetone, put them in the refrigerator for cooling and recrystallization, and dry them in a vacuum oven at 25°C for 24 hours to obtain a white solid powder, which is a polymerizable Ligand.

[0072] The preparation method of composite perovskite quantum dots coated with acrylate-based quaternary ammonium ligands is as follows: 0.07mmol CsCl, 0.1mmol PbCl2, 0,03mmol ligands are dissolved in 1ml of dimethylformamide, dropwise into 20ml of vigorous In the stirred toluene, a blue-green precipitate is produced, then add 1ml of iso...

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Abstract

The invention provides a perovskite quantum dot ligand. The ligand is an acrylate-based quaternary ammonium salt ligand, wherein a quaternary ammonium ion is positively charged, and the ligand can becombined with an unstable site on the surface of a quantum dot to improve the stability; on the other hand, an acrylate side chain can be polymerized into a long chain under the action of an initiator, and crosslinked by a crosslinking agent to make the ligand be coated onto the surface of the quantum dot, so that a network-crosslinked polymer structure coated onto the surface of the quantum dot prevents water and oxygen from being in contact with the surface of the quantum dot, and protects the crystal structure of the quantum dot from being destroyed by the water and oxygen in environment, thereby improving the optical stability; secondly, the ligand is fixed onto the surface of the quantum dot, and an adsorption-desorption process of the ligand on the surface of the quantum dot is eliminated, thereby eliminating surface defects caused by the adsorption-desorption process, and improving the optical property and stability of the quantum dot.

Description

technical field [0001] The invention relates to the field of semiconductor luminescent materials, in particular to a perovskite quantum dot ligand and a preparation method thereof, a composite perovskite quantum dot and a preparation method thereof. Background technique [0002] Quantum dots are an important low-dimensional semiconductor material, whose size in three dimensions is not larger than twice the exciton Bohr radius of the corresponding semiconductor material. Quantum dots are generally spherical or quasi-spherical, and their diameters are usually between 2-20nm. Common quantum dots are composed of IV, II-VI, IV-VI or III-V elements. Specific examples include silicon quantum dots, germanium quantum dots, cadmium sulfide quantum dots, cadmium selenide quantum dots, cadmium telluride quantum dots, zinc selenide quantum dots, lead sulfide quantum dots, lead selenide quantum dots, and indium phosphide quantum dots. dots and indium arsenide quantum dots, etc. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/66C07C219/08C07C213/00
CPCC09K11/025C09K11/665C07C219/08
Inventor 谢启飞王新中王恺陈明祥马艳红
Owner SHENZHEN INSTITUTE OF INFORMATION TECHNOLOGY
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