Core-shell structure nano crystal and preparation method thereof

A core-shell structure, nanocrystal technology, applied in nanotechnology, nanotechnology, nanooptics, etc., can solve the problems of difficult control of nanocrystal particle size, unfavorable to improve the color gamut of display devices, and large half-peak width of nanocrystal emission peak.

Pending Publication Date: 2020-08-18
SUZHOU XINGSHUO NANOTECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing commonly used cladding method is usually carried out by batch injection of shell precursors at high temperature. During the reaction process, the particle size of nanocrystals is difficult to control, so that the emission peak of the prepared nanocrystals Larger width at half peak
When the half-height width of nanocrystals is large, it will lead to more adverse consequences: for example, it is not conducive to improving the color gamut of display devices, etc. The development of a synthesis method that can reduce the half-height width of nanocrystals is very useful for the application of nanocrystals. Significance

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  • Core-shell structure nano crystal and preparation method thereof
  • Core-shell structure nano crystal and preparation method thereof

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Embodiment approach

[0044] According to a preferred embodiment of the present application, the preparation method of the reaction system comprising the nanocrystal nucleus comprises steps:

[0045] The nano crystal nucleus is obtained, and the nano crystal nucleus is dispersed in an organic solvent to obtain a reaction system containing the nano crystal nucleus.

[0046] According to a preferred embodiment of the present application, the preparation method of the reaction system comprising the nanocrystal nucleus comprises steps:

[0047] Adding the precursors required for synthesizing nano crystal nuclei to the organic solvent, allowing the precursors required for synthesizing nano crystal nuclei to react in the organic solvent to generate nano crystal nuclei to obtain a reaction system containing nano crystal nuclei.

[0048] According to a preferred embodiment of the present application, the organic solvent includes at least one of C10-C22 alkanes, alkenes, halogenated hydrocarbons, aromatic h...

Embodiment 1

[0054] Preparation of core-shell structure nanocrystal 1:

[0055] Step 1-1, obtaining a reaction system containing InP nanocrystal nuclei: under an inert gas atmosphere, make 1mmol InCl 3 , 2mmolZnCl 2 , 20 mL of oleylamine, and 4 mmol of tris(diethylamino)phosphine were mixed, heated at 120°C for reaction, then at 190°C, a total of 5 mL of selenium-trioctylphosphine solution (2M) was added to the reaction system, and reacted for 30 minutes to obtain InP Nanocrystalline nucleus; in this step 1-1, the surface of InP nanocrystalline nucleus contains a very thin ZnSe layer, is to protect InP nanocrystalline nucleus, and this very thin ZnSe layer can be regarded as a part of InP nanocrystalline nucleus;

[0056] Step 1-2, preparation of the transition layer: Add 5 mmol of zinc stearate at one time to the reaction system at 190 °C in step 1-1, and add 20 mL of selenium trioctylphosphine solution (2M) in a gradient manner ;The method of adopting staged gradient temperature rise i...

Embodiment 2

[0059] Preparation of core-shell structure nanocrystal 2:

[0060] Step 2-1, obtaining a reaction system containing InP nanocrystal nuclei: under an inert gas atmosphere, make 1mmol InCl 3 , 2mmolZnCl 2 , 20 mL of oleylamine, and 4 mmol of tris(diethylamino)phosphine were mixed, heated and reacted at 120° C., and then at 180° C., a total of 3 mL of selenium trioctylphosphine solution (2M) was added to the reaction system, and reacted for 30 minutes to obtain InP nanocrystal nucleus: In the step 2-1, there will be a very thin ZnSe layer on the surface of the InP nanocrystal nucleus to protect the InP nanocrystal nucleus, and this very thin ZnSe layer can be regarded as a part of the InP nanocrystal nucleus;

[0061] Step 2-2, preparation of the transition layer: Add 10 mmol of zinc stearate at one time to the reaction system at 180° C. in step 2-1, and add 30 mL of selenium trioctylphosphine solution (2M) in a gradient manner ; At the same time, the temperature of the reactio...

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Abstract

The invention discloses a core-shell structure nano crystal and a preparation method thereof. The preparation method of the core-shell structure nano crystal comprises the following steps: adding precursors for synthesizing a transition layer into a reaction system containing a nano crystal nucleus so as to coat the surface of the nano crystal nucleus with a transition layer; and coating the surface of the transition layer with an outer shell layer to obtain the core-shell structure nano crystal, wherein there are at least two precursors for synthesizing the transition layer, the precursors are added in a staged gradient heating mode, which comprises at least two temperature steps; and the precursors react on each temperature step to generate a part of the transition layer. Due to the factthat the transition layer is synthesized at different temperature steps, each part of the transition layer is cured for a long term after being synthesized, the finally synthesized transition layer of the nano crystal is more uniform, and the half-peak width of the nano crystal is remarkably reduced.

Description

technical field [0001] The application belongs to the technical field of nanomaterial preparation, and in particular relates to a nanocrystal with a core-shell structure and a preparation method thereof. Background technique [0002] Nanocrystals have the characteristics of high color purity, excellent luminous range adjustability, good biocompatibility, etc., and have great application value in the fields of display, lighting, and biological imaging. [0003] Surface defects in nanocrystals increase the chance of non-radiative transitions, which adversely affect their luminescent properties. In order to solve this problem, a shell layer is generally coated on the surface of the nanocrystalline core to enhance its luminous efficiency and stability. [0004] However, the existing commonly used cladding method is usually carried out by batch injection of shell precursors at high temperature. During the reaction process, the particle size of nanocrystals is difficult to contro...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/70C09K11/88C09K11/56B82Y20/00B82Y30/00C23C18/12C30B7/14C30B29/40
CPCC09K11/02C09K11/70C09K11/883C09K11/565B82Y20/00B82Y30/00C30B29/40C30B7/14C23C18/1204C23C18/1245
Inventor 刘东强单玉亮王允军
Owner SUZHOU XINGSHUO NANOTECH CO LTD
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