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Cleaning method and preparation method of quantum dots

A technology of quantum dots and cations, applied in the field of quantum dots, can solve the problem of low cleaning yield of quantum dots

Pending Publication Date: 2021-12-17
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

When cationic-TOPO (tri-n-octylphosphine oxide) and cationic-ODPA (octadecyl orthophosphate) were used as cationic precursors, the cleaning yield of quantum dots obtained was low

Method used

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  • Cleaning method and preparation method of quantum dots
  • Cleaning method and preparation method of quantum dots
  • Cleaning method and preparation method of quantum dots

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preparation example Construction

[0076] The present application also provides a method for preparing quantum dots, which includes: preparing quantum dots, and then cleaning the quantum dots according to the above cleaning method for quantum dots.

[0077] The method for preparing quantum dots is as follows:

[0078] Mix the precursor solution containing cations and the precursor solution containing anions and keep warm at 280-310°C to form a reaction solution with quantum dot nanocrystal nuclei, and stop when the wavelength of quantum dots in the reaction solution moves to the target position react to prepare a solution containing quantum dots, add a non-polar solvent and a polar solvent to the solution of quantum dots, and centrifuge to obtain quantum dots.

[0079] The precursor solution containing cations includes a second coordination solvent, and the second coordination solvent is tri-n-octylphosphine oxide and / or octadecyl orthophosphate.

[0080] The number of moles of cations in the precursor solutio...

Embodiment 1

[0095] The embodiment of the present application provides a method for preparing quantum dots, which includes:

[0096] 1. Preparation of quantum dots

[0097] Add 1.5mmol of cadmium oxide, 3mmol of octadecyl orthophosphate and 20mL of octadecene into the three-necked flask, and purge the three-necked flask with argon for 20min at room temperature, and heat the three-necked flask at a heating rate of 20°C / min. The flask was heated to 110°C and kept warm for 30 minutes. Then heat up to 300°C, quickly inject 1.0 mmol of selenium element-tri-n-octyl phosphorus solution under the liquid level of the three-necked bottle to form a reaction solution with quantum dot nanocrystal nuclei, and detect the wavelength shift of the quantum dots in the reaction solution The reaction was stopped after reaching 530 nm, and a solution containing quantum dots was prepared.

[0098] After the solution containing quantum dots was cooled to 100°C, the solution containing quantum dots was mixed wit...

Embodiment 2

[0104] The embodiment of the present application provides a method for preparing quantum dots, which includes:

[0105] 1. Preparation of quantum dots

[0106] Add 1.5mmol of cadmium oxide, 3mmol of tri-n-octylphosphine oxide and 20mL of octadecene into the three-necked bottle. The flask was heated to 110°C and kept warm for 30 minutes. Then heat up to 300°C, quickly inject 1.0 mmol of selenium element-tri-n-octyl phosphorus solution under the liquid level of the three-necked bottle to form a reaction solution with quantum dot nanocrystal nuclei, and detect the wavelength shift of the quantum dots in the reaction solution The reaction was stopped after reaching 530 nm, and a solution containing quantum dots was prepared.

[0107] After the solution containing quantum dots was cooled to 100°C, the solution containing quantum dots was mixed with 40 mL of absolute ethanol and 20 mL of n-hexane, and centrifuged to obtain quantum dots.

[0108] 2. Ligand exchange for quantum dot...

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Abstract

The invention provides a cleaning method and a preparation method of quantum dots, and belongs to the technical field of quantum dots. The cleaning method of the quantum dots comprises the steps that: the quantum dots are dispersed in a first non-coordination solvent, a first coordination solvent is added, and stirring reaction is conducted for 20-40 min at the temperature of 80-120 DEG C; and ligands of the quantum dots are tri-n-octylphosphine oxide and / or octadecyl orthophosphate. The mole number of the first coordination solvent is 2-3 times of the mole number of cations of the quantum dots. The first coordination solvent is oleic acid and / or zinc oleate. For the quantum dots with tri-n-octylphosphine oxide and / or octadecyl orthophosphate as ligands, according to the cleaning method of the quantum dots, oleic acid and / or zinc oleate are / is adopted for exchanging the ligands on the surfaces of the quantum dots, the ligands on the surfaces of the quantum dots are changed into oleic acid and / or zinc oleate, and in the subsequent cleaning process, the cleaning yield of the quantum dots can be increased.

Description

technical field [0001] The present application relates to the technical field of quantum dots, in particular, to a cleaning method and preparation method of quantum dots. Background technique [0002] Quantum dots (QDs), also known as semiconductor nanocrystals, are nanoparticles composed of II-VI or III-V elements, with a diameter of about 1-100 nm. Due to the small size of quantum dots, it has special small size effect, surface effect, quantum size effect and macroscopic quantum tunnel effect. Quantum dots exhibit unique optical properties, such as high quantum yield, long fluorescence lifetime, large extinction coefficient, strong light tolerance, narrow emission spectrum and wide excitation spectrum range, etc. The preparation and application of quantum dots have aroused widespread research interest, and have broad application prospects in the fields of biomedicine and optoelectronics. [0003] The reaction system of II-VI or III-V quantum dots is an oily system, and t...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/56C09K11/88B08B3/08B82Y20/00B82Y40/00
CPCC09K11/025C09K11/883C09K11/565B08B3/08B82Y20/00B82Y40/00
Inventor 孙培川宋斌梁凯旋姚琪
Owner 合肥福纳科技有限公司
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