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Particle and preparation method thereof

A particle and surface ligand technology, applied in the field of quantum dots, can solve problems such as large differences in coordination ability, inability to finely adjust the degree of coordination, and limited selection of functional groups, so as to enhance coordination ability and ensure sufficient passivation , Improve the effect of luminous performance

Inactive Publication Date: 2019-06-11
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a particle and its preparation method, aiming to solve the problem that the existing functional groups that can coordinate with the surface of quantum dots are very limited, and the ability to coordinate with each other is limited. The difference is large, and it is impossible to fine-tune the degree of coordination

Method used

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Effect test

Embodiment 1

[0110] The preparation of the present embodiment CdSe / ZnS quantum dots comprises the following steps:

[0111] 1) Add 0.8mmol cadmium oxide, 8mmol zinc acetate, 10mL oleylamine and 30mL octadecene into a 100mL three-necked flask, and exhaust at 170°C for 30 minutes to remove water and oxygen in the reaction system;

[0112] 2), after the reaction system is filled with argon, the temperature is raised to 300 degrees;

[0113] 3) Rapidly inject a mixed reaction solution of 0.2 mmol of elemental selenium, 8 mmol of elemental sulfur and 4 mL of trioctylphosphine into the reaction system, and react at 300 degrees for 10 minutes to obtain CdSe / ZnS quantum dots.

[0114] The luminescence wavelength of the obtained CdSe / ZnS quantum dots in n-hexane solvent is 525 nanometers, the peak width is 25 nanometers, and the yield of quantum dots is 53%.

Embodiment I

[0116] The preparation of InP / ZnSeS quantum dots in this embodiment comprises the following steps:

[0117] 1) Add 0.16mmol indium chloride, 1mL tetrahydrofuran, 0.5mL oleic acid and 8mL octadecene into a 50mL three-necked flask, and exhaust at 150 degrees for 30 minutes to remove water and oxygen in the reaction system;

[0118] 2), after the reaction system is filled with argon, the temperature is raised to 280 degrees;

[0119] 3) Quickly inject 0.06mmol P(TMS) into the reaction system 3 (Tri-trimethylsilylphosphorus), a mixed solution of 0.5mL octadecene, and react at 280 degrees for 20 seconds to obtain the InP quantum dot core;

[0120] 4), inject 0.04mmol Se-TOP precursor, 1.2mmol dodecyl mercaptan, 2mmol zinc oleate into the reaction system at a uniform speed within 30 minutes;

[0121] 5) After the reaction, the temperature is naturally lowered to obtain InP / ZnSeS quantum dots.

[0122] The luminescence wavelength of the obtained InP / ZnSeS quantum dots in n-hexane ...

Embodiment 3

[0124] This embodiment takes figure 1 Structural molecules are used as surface ligands, and the particles of this embodiment (the particles are composed of: CdSe / ZnS quantum dots and the CdSe / ZnS quantum dot surface combined figure 1 The preparation of structure molecule) comprises the following steps:

[0125] 1), weigh 400 mg of CdSe / ZnS quantum dots in the above-mentioned embodiment 1 and add them into 20 mL of octadecene to fully dissolve to obtain a CdSe / ZnS quantum dot solution;

[0126] 2), add 0.5mL surface ligand to the above CdSe / ZnS quantum dot solution at one time;

[0127] 3), the mixed system was heated up to 120 degrees Celsius, and reacted for 60 minutes under a nitrogen atmosphere;

[0128] 4) After cooling the reaction system to room temperature, the particles are obtained by centrifugal separation and washing.

[0129] The yield of the particles was 62%.

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Abstract

The invention discloses a particle and a preparation method thereof. The particlecomprises a quantum dot and a surface ligand bound to the surface of the quantum dot. The molecular structure of the surface ligand is P1-P2-P3, wherein the P1 is a coordination group coordinated with an atom on the surface of the quantum dot, the P2 is an organic group with a conjugated system of a benzene ring and the P3 is an electron-donating organic group. In the present invention, a delocalized conjugated electron cloud is formed by the organic group P2 with the conjugated system of the benzene ring, and then the delocalized conjugated electron cloud system is moved to the coordination group P1 by the electron-donating organic group P3. Thus, the coordination ability of coordination lone pair electrons of a coordination atom on the coordination group P1 and the coordination atom on the surface of the quantum dot is greatly enhanced and the firmness of a coordination bond is enhanced. Therefore, sufficient passivation of the surface of the quantum dot can be effectively guaranteed and the luminescence performance of a quantum dot material can be improved.

Description

technical field [0001] The invention relates to the technical field of quantum dots, in particular to a particle and a preparation method thereof. Background technique [0002] Quantum dots are a special material that is confined to the order of nanometers in three dimensions. This remarkable quantum confinement effect makes quantum dots have many unique nanometer properties: continuously adjustable emission wavelength, narrow emission wavelength, Broad absorption spectrum, high luminous intensity, long fluorescence lifetime and good biocompatibility, etc. These characteristics make quantum dots have broad application prospects in biomarkers, flat panel displays, solid-state lighting, photovoltaic solar energy and other fields. [0003] The size of quantum dots is usually below 20 nanometers, so the specific surface area of ​​quantum dot materials is very large, and the surface characteristics and properties of quantum dots have a significant impact on the performance of qu...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/88
Inventor 杨一行
Owner TCL CORPORATION
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