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Quantum dot with core-shell structure as well as preparation method and application of quantum dot

A technology of core-shell structure and quantum dots, applied in the field of quantum dots, can solve the problems of low luminous efficiency, achieve high luminous efficiency, simple operation, and improve half-peak width and emission peak intensity

Active Publication Date: 2021-07-16
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low luminous efficiency in existing copper-based quantum dots

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  • Quantum dot with core-shell structure as well as preparation method and application of quantum dot

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preparation example Construction

[0021] as attached figure 1 As shown, the embodiment of the present invention provides a method for preparing quantum dots with a core-shell structure, comprising the following steps:

[0022] S10. Obtain CuGaSe x S 2-x Quantum dot solution, wherein, 0<x≤2;

[0023] S20. the CuGaSe x S 2-x The quantum dot solution is heated to a first preset temperature;

[0024] S30. adding zinc precursor solution and mixing treatment;

[0025] S40. Adding a selenium precursor solution and a sulfur precursor solution, controlling the addition rate of the selenium precursor solution and the sulfur precursor solution, to obtain core-shell structure quantum dots.

[0026] The preparation method of the quantum dot of core-shell structure provided by the embodiment of the present invention uses CuGaSe x S 2-x quantum dots as the core, by incorporating CuGaSe x S 2-x After the quantum dot solution is heated to the optimum reaction activity temperature, the zinc precursor solution is added...

Embodiment 1

[0062] A core-shell quantum dot of CuGaSeS / ZnSeS, comprising the following preparation steps:

[0063] Preparation of S11.CuGaSeS quantum dots:

[0064] Under an inert gas atmosphere, 160 mg of copper sulfate (CuSO 4 ), 176mg gallium chloride (GaCl 3 ) and 10ml of oleylamine (Oleyl amine) were mixed in a three-necked flask, then the mixed solution was degassed for 60 minutes, and then the degassed mixed solution was heated to 170°C under an inert atmosphere, and the copper-gallium precursor solution was formed when the solution became clear . Mix 4ml of oleylamine (Oleyl amine), 103mg of sodium hydride selenide (NaHSe) and 32mg of sulfur powder (S) for ultrasonication for 1h, then heat the copper-gallium precursor solution to 300°C under an inert atmosphere, and the obtained selenium-sulfur precursor The solution was injected into the copper gallium precursor solution and reacted for 1 hour to obtain a CuGaSeS quantum dot solution.

[0065] S21. Zinc precursor solution, sulf...

Embodiment 2

[0072] a CuGaSe 0.5 S 1.5 / ZnSeS / ZnS core-shell structure quantum dots, including the following preparation steps:

[0073] S12. CuGaSe 0.5 S 1.5 Preparation of quantum dots:

[0074] Under an inert gas atmosphere, 160 mg of copper sulfate (CuSO 4 ), 176mg gallium chloride (GaCl 3 ) and 10ml of oleylamine (Oleyl amine) were mixed in a three-necked flask, then the mixture was heated to 120°C under vacuum and degassed for 60 minutes, and then the degassed mixture was heated to 180°C under an inert atmosphere until the solution became Clarification forms the copper gallium precursor solution. Mix 4ml of oleylamine (Oleyl amine), 52mg of sodium hydride selenium (NaHSe) and 48mg of sulfur powder (S) for ultrasonication for 1h, then heat the copper-gallium precursor solution to 310°C under an inert atmosphere, and the obtained selenium-sulfur precursor The solution was injected into the copper gallium precursor solution and reacted for 1.5h to obtain CuGaSe 0.5 S 1.5 Quantu...

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Abstract

The invention belongs to the technical field of quantum dots, and particularly relates to a quantum dot with a core-shell structure, which comprises a CuGaSexS2-x quantum dot core and a ZnSeS shell layer or a ZnSeS / ZnS shell layer formed on the surface of the CuGaSexS2-x quantum dot core. According to the CuGaSexS2-x / ZnSeS core-shell structure quantum dot or the CuGaSexS2-x / ZnSeS / ZnS core-shell structure quantum dot provided by the invention, the CuGaSexS2-x quantum dot core with poor stability is coated by the ZnSeS shell layer with good stability or the ZnSeS / ZnS shell layer, so that the air, light and chemical stability of a quantum dot material is effectively improved, meanwhile, the luminous efficiency of the quantum dot is improved, the quantum luminous efficiency can be improved to 73.8% or above, and the quantum dot elements are non-toxic, green and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of quantum dots, and in particular relates to a quantum dot with a core-shell structure and a preparation method and application thereof. Background technique [0002] Quantum dot materials are semiconductor nanocrystals with a size of 1-10 nm. Due to the characteristics of high luminous efficiency, wide excitation range, narrow emission spectrum, adjustable color wavelength, and strong stability, quantum dot materials have attracted more and more attention in the application of display technology, solar cells, and biotechnology. Compared with traditional solar cells, quantum dot-sensitized solar cells have the advantages of good stability, relatively low cost, and adjustable bandgap width, which has become a hot research topic in recent years. The anode of the quantum dot sensitized solar cell is composed of titanium dioxide nanoparticles adsorbed with quantum dot sensitized materials, wherein, after the q...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/88B82Y20/00B82Y40/00H01G9/20H01G9/042
CPCC09K11/02C09K11/883B82Y20/00B82Y40/00H01G9/2031H01G9/2022Y02E10/542
Inventor 梁良吴龙佳
Owner TCL CORPORATION
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