Quantum dot surface ligand exchange method

A surface ligand and ligand exchange technology, applied in the field of quantum dots, can solve the problems of weak binding between the surface of quantum dots and ligands, poor stability and dispersion of quantum dot colloidal solutions, etc., and achieve fast reaction rate and strong stability , combined with a firm effect

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

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Problems solved by technology

[0008] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a method for ligand exchange on the surface of quantum dots, which aims to solve the problems of weak binding between the surface of quantum dots and ligands, and poor stability and dispersibility of quantum dot colloidal solutions. bad question

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Effect test

Embodiment 1

[0061] 1. Preparation of quantum dots whose surface ligand is octadecenoic acid:

[0062] 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;

[0063] 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;

[0064] 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.

[0065] 2. Deprotonation of prot...

Embodiment 2

[0072] 1. Preparation of ZnO quantum dots whose surface ligand is stearic acid:

[0073] 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;

[0074] 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;

[0075]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 obt...

Embodiment 3

[0081] 1. Preparation of quantum dots whose ligand is octadecenoic acid:

[0082] 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;

[0083] 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;

[0084] 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.

[0085] 2. Deprotonation of proton-conta...

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Abstract

The invention discloses a quantum dot surface ligand exchange method, which comprises: pre-treating a proton-containing ligand by using a deprotonating agent to obtain a deprotonated ligand; mixing apre-prepared original ligand quantum dot solution and the deprotonated ligand; stirring for a predetermined time at a room temperature; and carrying out a ligand exchange reaction, and washing to obtain the quantum dot with the deprotonated ligand on the surface. According to the present invention, the quantum dot surface ligand exchange method has characteristics of rapid reaction and simple operation, the deprotonated ligand after the exchange is firmly combined with the cation on the surface of the quantum dot, and the exchanged quantum dot colloid solution has characteristics of strong stability, good solubility and high light-emitting efficiency.

Description

technical field [0001] The invention relates to the technical field of quantum dots, in particular to a ligand exchange method on the surface of quantum dots. 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, wide-band excitation, and adjustable emission bandgap, so they are widely used in optoelectronics. devices and biomedicine. [0003] At present, the most common method for preparing quantum dots is to use metal-organic cation precursors to thermally inject anion precursors at high temperatures to generate quantum dots. The organic compounds introduced in the anion and cation precursors include trioctylphosphine, tributylphosphine, and oleic acid , stearic acid, oleylamine, etc. The introduction of these organic substances can adjust the crystal growth rate, crystal morphology, and crystal siz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88C09K11/54
CPCC09K11/025C09K11/54C09K11/883
Inventor 覃辉军杨一行
Owner TCL CORPORATION
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