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Preparation method of quantum dots using deprotonated carboxylic acid 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 and weak binding of ligands, and achieve the effects of fast reaction rate, high luminous efficiency, and strong binding.

Inactive Publication Date: 2018-12-11
TCL CORPORATION
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  • Abstract
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  • 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 ligands are deprotonated carboxylic acids, aiming to solve the problem that the surface of existing quantum dots is not firmly bound to carboxylic acid ligands. Problems leading to poor stability of quantum dot colloidal solutions

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  • Preparation method of quantum dots using deprotonated carboxylic acid as surface ligand

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Embodiment 1

[0044] 1. Preparation of quantum dots whose ligand is trioctylphosphine:

[0045] 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;

[0046] 2) Preparation of trioctylphosphine selenide-trioctylphosphine sulfide precursor: Dissolve 0.2 mmol of Selenium powder and 0.6 mmol of sulfur powder in 2 mL of Trioctylphosphine , to obtain trioctylphosphine selenide-trioctylphosphine sulfide precursor;

[0047] 3) Slowly heat the cadmium-zinc oleate precursor solution to 300°C, inject trioctylphosphine selenide-trioctylphosphine sulfide precursor quickly 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 twic...

Embodiment 2

[0055] 1. Preparation of quantum dots whose ligand is tributylphosphine:

[0056] 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;

[0057] 2) Preparation of tributylphosphine selenide-tributylphosphine sulfide precursor: Dissolve 0.2 mmol Selenium powder and 0.6 mmol Sulfur powder in 2 mL of Trioctylphosphine , to obtain tributylphosphine selenide-tributylphosphine sulfide precursor;

[0058] 3) Slowly heat the cadmium-zinc oleate precursor solution to 300°C, inject tributylphosphine selenide-tributylphosphine sulfide precursor quickly 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 centrifuge repeatedly twice to o...

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Abstract

The invention discloses a preparation method of quantum dots using deprotonated carboxylic acid as a surface ligand. The preparation method comprises: pre-treating carboxylic acid by using an organicalkali or an inorganic alkali to obtain a carboxylate solution; and mixing a pre-prepared original ligand quantum dot solution and the carboxylate solution, stirring for a predetermined time at a roomtemperature, carrying out a ligand exchange reaction, and washing to obtain the quantum dots using the deprotonated carboxylic acid as the surface ligand. According to the present invention, the reaction rate of the preparation method is rapid, the deprotonated carboxylic acid after the exchange is firmly combined with the cation on the surface of the quantum dot, and the finally obtained quantumdot colloid solution using the deprotonated carboxylic acid as the surface ligand 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 method for preparing quantum dots whose surface ligands are deprotonated carboxylic acids. 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, etc., the introduction of these organic substances can adjust the crystal growth rate, crystal mo...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/88B82Y20/00B82Y30/00B82Y40/00C09K11/06
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/025C09K11/06C09K11/883C09K2211/188
Inventor 覃辉军杨一行
Owner TCL CORPORATION
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