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Preparation method of quantum dots using deprotonated amine as surface ligand

A surface ligand and proton removal technology, applied in the field of quantum dots, can solve the problems of poor stability of quantum dot colloid solution, weak binding between quantum dot surface and ligand, etc. Effect

Inactive Publication Date: 2018-12-11
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for preparing quantum dots whose surface ligand is deprotonated amine, aiming to solve the problem that the existing quantum dot surface is not firmly bound to the ligand, which leads to the quantum dot colloid The problem of poor solution stability

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  • Preparation method of quantum dots using deprotonated amine as surface ligand

Examples

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Embodiment 1

[0048] 1. Preparation of quantum dots whose surface ligand is octadecenoic acid:

[0049] 1) Preparation of cadmium-zinc oleate precursor solution: Take 0.8mmol CdO, 8mmol zinc acetate, 15 ml oleic acid and 20 ml 1-octadecene in a 100mL three-necked flask, heat to 150°C under Ar atmosphere and exhaust for 1h. Form a transparent cadmium-zinc oleate precursor solution;

[0050] 2) Preparation of Se-S-ODE precursor solution: 0.8 mmol Se and 8 mmol S were dissolved in 6 mL 1-octadecene solution at 140°C to form Se-S-ODE precursor solution;

[0051] 3) Slowly heat the cadmium-zinc oleate precursor solution to 300°C, quickly inject the Se-S-ODE precursor solution once, and keep the reaction for 8 minutes. Then lower the temperature to 100°C, add ethyl acetate to wash, and centrifuge to obtain a precipitate; then add chloroform and acetone and repeat centrifugation twice to obtain a quantum dot precipitate whose surface ligand is octadecenoic acid.

[0052] 2. Deprotonation of prot...

Embodiment 2

[0059] 1. Preparation of ZnO quantum dots whose surface ligand is stearic acid:

[0060] 1) Preparation of zinc stearate precursor solution: Take 2 mmol of zinc stearate and add 30 ml ODE to exhaust with Ar at 130°C for 30 minutes, the solution becomes colorless and transparent, and the zinc stearate precursor solution is obtained;

[0061] 2) Preparation of long-chain alcohol precursor solution: Dissolve 10 mmol ODA in 12.6 ml ODE, degas at 130°C for 30 min, the solution is colorless and transparent, then heat up the solution to 200°C to obtain long-chain alcohol Precursor;

[0062] 3) Preparation of ZnO quantum dots: The temperature of the zinc stearate solution was raised to 270 °C, and then the long-chain alcohol solution was quickly injected into the zinc stearate solution once, and the reaction was maintained at 250 °C for 4 min. Then the solution was cooled to room temperature, washed twice to obtain a precipitate, and dried in vacuum at room temperature for 24 h to ob...

Embodiment 3

[0069] 1. Preparation of quantum dots whose surface ligand is octadecenoic acid:

[0070] 1) Preparation of cadmium-zinc oleate precursor solution: Take 0.8mmol CdO, 8mmol zinc acetate, 15 ml oleic acid and 20 ml 1-octadecene in a 100mL three-necked flask, heat to 150°C under Ar atmosphere and exhaust for 1h. Form a transparent cadmium-zinc oleate precursor solution;

[0071] 2) Preparation of Se-S-ODE precursor solution: 0.8 mmol Se and 8 mmol S were dissolved in 6 mL 1-octadecene solution at 140°C to form Se-S-ODE precursor solution;

[0072] 3) Slowly heat the cadmium-zinc oleate precursor solution to 300°C, quickly inject the Se-S-ODE precursor solution once, and keep the reaction for 8 minutes. Then lower the temperature to 100°C, add ethyl acetate to wash, and centrifuge to obtain a precipitate; then add chloroform and acetone and repeat centrifugation twice to obtain a quantum dot precipitate whose surface ligand is octadecenoic acid.

[0073]2. Deprotonation of proto...

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Abstract

The invention discloses a preparation method of quantum dots using deprotonated amine as a surface ligand. The preparation method comprises: pre-treating a proton-containing amine by using acyl chloride or sulfonyl chloride to obtain a corresponding deprotonated amine solution; and mixing a pre-prepared original ligand quantum dot solution and the deprotonated amine solution, stirring for a predetermined time at a room temperature, carrying out a ligand exchange reaction, and washing to obtain the quantum dots using the deprotonated amine as the surface ligand. According to the present invention, the reaction rate of the preparation method is rapid, the deprotonated amine after the exchange is firmly combined with the cation on the surface of the quantum dot, and finally the obtained quantum dot colloid solution using the deprotonated amine as the surface ligand has characteristics of strong stability and high light-emitting efficiency.

Description

technical field [0001] The invention relates to the technical field of quantum dots, in particular to a method for preparing quantum dots whose surface ligands are deprotonated amines. Background technique [0002] Fluorescent semiconductor nanocrystals, also known as quantum dots, have many unique luminescent properties compared with traditional fluorescent dye molecules, such as: resistance to photobleaching, excitation band, adjustable emission band gap, etc., so they are widely used in optoelectronic devices and biomedical fields. [0003] At present, the most common method of preparing quantum dots is to use thermal injection, injecting anion precursors into metal-organic cation precursors at high temperature to react to form quantum dots. The organic compounds introduced in the anion and cation precursors include P-containing compounds, long chain The introduction of these organic substances can adjust the crystal growth rate, crystal morphology, and crystal size dist...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/54B82Y20/00B82Y30/00
CPCB82Y20/00B82Y30/00C09K11/02C09K11/54
Inventor 覃辉军杨一行
Owner TCL CORPORATION
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