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Quantum dots with stable ligand, preparation method thereof and QLED device

A technology of quantum dots and quantum dot layers, applied in the field of quantum dots, can solve problems such as poor stability of QLED

Pending Publication Date: 2020-11-03
合肥福纳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the embodiment of the present application is to provide a quantum dot with a stable ligand and its preparation method, and a QLED device, which aims to improve the problem of poor stability of the existing QLED

Method used

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  • Quantum dots with stable ligand, preparation method thereof and QLED device
  • Quantum dots with stable ligand, preparation method thereof and QLED device
  • Quantum dots with stable ligand, preparation method thereof and QLED device

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preparation example Construction

[0033] The method for preparing quantum dots with stable ligands comprises the following steps:

[0034] Step S1, preparing a first quantum dot solution.

[0035] The above-mentioned first quantum dot includes a first ligand and a core-shell structure, the first ligand includes at least one of oleic acid, oleylamine or thiol; the components of the core-shell structure include Cd, Zn, Se and S.

[0036] It should be noted that the above-mentioned first quantum dots can be synthesized and prepared by reacting precursors of elements such as Cd, Zn, Se and S by adopting a common one-pot method or two-pot method in the art. It can also be purchased directly.

[0037] Further, the above-mentioned core-shell structure can be at least the following structure:

[0038] CdSe / ZnSe / ZnS, CdZnSe / ZnSe / ZnS, CdZnSe / ZnSe / CdZnS, CdSe / ZnSe / CdZnS, CdZnSe / ZnSe / CdZnS / ZnS, CdZnS / ZnS, etc.

[0039] In some specific embodiments of the present application, the above-mentioned first quantum dots are p...

Embodiment 1

[0094] A quantum dot with a stable ligand is provided, which is prepared by:

[0095] (1) Dissolve the synthesized first quantum dots whose ligands are common ligands such as oleic acid, oleylamine, or mercaptan in n-hexane solution, heat to 40°C, stir and mix to obtain a clear solution, and obtain 0.01 mmol / ml of the first quantum dot solution.

[0096] (2) Prepare a n-hexane solution of tribenzylamine, dissolve 3 g of tribenzylamine powder in 6 ml of n-hexane solution, heat to 40° C., stir and mix to obtain a clear solution.

[0097] (3) Take 2ml of the tribenzylamine solution prepared in step (2) and add it to 3ml of the first quantum dot solution prepared in step (1), then heat the mixture to 70°C and stir for 24h to obtain the three A quantum dot solution in which benzylamine is a ligand; wherein, the ratio of tribenzylamine to the amount of the first quantum dot is 100:1. Then add ethanol to precipitate, centrifuge, remove the supernatant, add 3ml of n-octane to the p...

Embodiment 2

[0100] A quantum dot with a stable ligand is provided, the difference from Example 1 is that the ratio of the amount of tribenzylamine to the amount of the first quantum dot is 50:1.

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Abstract

The invention relates to the field of quantum dots, in particular to quantum dots with a stable ligand, a preparation method of the quantum dots and a QLED device. The preparation method comprises thefollowing steps: mixing a tribenzylamine solution with a first quantum dot solution, and heating the mixed solution to 40-80 DEG C for reaction, wherein the first quantum dots comprise a first ligandand a core-shell structure, and the first ligand comprises at least one of oleic acid, oleylamine or mercaptan. Due to the fact that tribenzylamine has high chemical polarity, the chelating capacityof tribenzylamine and metal ions on the surfaces of the quantum dots is far higher than that of oleic acid and other conventional ligands, and the conventional ligands of the first quantum dots can bereplaced with the tribenzylamine through the mixing and reacting the tribenzylamine solution and the first quantum dot solution containing the conventional ligands. The coordination bond formed by tribenzylamine and the quantum dots is very high in strength, so that the chemical potential of Zn ions or Cd ions on the surface of the quantum dots is greatly improved, the Zn ions and the Cd ions aredifficult to reduce and separate out, and the stability of the QLED device is improved.

Description

technical field [0001] The present application relates to the field of quantum dots, in particular, to a quantum dot with a stable ligand, a preparation method thereof, and a QLED device. Background technique [0002] Group II-VI quantum dots are mainly composed of four elements: Cd, Zn, Se, and S. Usually, one-pot method or two-pot method is used to synthesize quantum dots with different structures from the precursors of Cd, Zn, Se, and S. point. Currently, the ligands of such quantum dots are usually the same as the organic ligands of the precursors used, such as oleic acid, oleylamine, etc. [0003] As shown in Figure 1, the strip-shaped tentacles on the periphery of the quantum dot core-shell structure are the ligands coated outside the quantum dot spherical structure. Its main function is to prevent the aggregation of quantum dots, protect the internal structure of quantum dots, and reduce the of surface defects. Quantum dots can be used in QLED devices. [0004] Ex...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/88B82Y20/00B82Y30/00B82Y40/00H01L51/50
CPCC09K11/025C09K11/883B82Y20/00B82Y30/00B82Y40/00H10K50/115
Inventor 梁凯旋汪鹏生
Owner 合肥福纳科技有限公司
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