Nanocrystalline quantum dot with core-shell structure and preparation method of nanocrystalline quantum dot

A technology of nanocrystals and quantum dots, which is applied in the field of nanocrystal quantum dots and its preparation, can solve problems such as poor stability, reduced efficiency, and stability impact, and achieve the effects of excellent luminescent materials, improved fluorescence efficiency, and easy operation

Active Publication Date: 2013-05-22
NANJING TECH CORP LTD
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Problems solved by technology

In 2009, Peng's laboratory synthesized CuInS with core-shell structure by atomic layer continuous adsorption method. 2 The fluorescence efficiency of /ZnS quantum dots has been increased to 30%, and the stability has been partially improved, but there is still a lot of room for improvement in terms of fluorescence efficiency and stability
[0005] The problem of poor stability also exists in III-V quantum dots. For example, the efficiency of pure InP is <1%. Although the traditional ZnS coating method can improve the efficiency of InP, its stability is still poor. 90% reduction in efficiency within 24 hours
In...

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preparation example Construction

[0024] The invention provides a method for preparing nanocrystalline quantum dots with a core-shell structure, comprising the following steps: preparing a nanocrystalline core; Nanocrystalline quantum dots; wherein, the step of in-situ purification of the nanocrystalline nucleus is also included before the step of in-situ coating the surface of the nanocrystalline nucleus with zinc sulfide, and / or after the step of in-situ coating the surface of the nanocrystalline nucleus with zinc sulfide A step of in-situ purification of nanocrystalline quantum dots is included.

[0025] During the in-situ coating process of zinc sulfide on the surface of the nanocrystalline core, the in-situ purification of the uncoated zinc sulfide nanocrystalline core or the coated nanocrystalline quantum dots or the uncoated zinc sulfide nanocrystalline After the crystal nucleus is purified, the nanocrystalline quantum dots coated with zinc sulfide are purified again, which improves the fluorescence eff...

Embodiment approach

[0027] According to a typical embodiment of the present invention, the step of in-situ purifying the nanocrystalline core or nanocrystalline quantum dots includes: adding the nanocrystalline quantum dots that have not been coated with zinc sulfide to the solution of nanocrystalline cores that have not been coated with zinc sulfide. Add an organic purifying agent to the mixture, stir it with magnetic force, let it stand for stratification, and separate to obtain surface-purified nanocrystalline cores or nanocrystalline quantum dots. Organic purifiers refer to organic solvents that can remove copper ions, indium ions and other acid ligands, amine ligands, etc. The species of epitaxial growth facilitates the continued growth of ZnS on the surface of quantum dots. The in-situ purification step solves the problem that the epitaxial growth of the zinc sulfide layer is hindered by factors such as the migration of copper ions or indium ions or surface impurities on the surface of the ...

Embodiment 1

[0040] Preparation of I-III-VI / II-VI nanocrystalline quantum dots Cu-Zn-In-S / ZnS:

[0041] First, take 0.15mmol of zinc acetate, 0.1mmol of indium acetate, 0.05mmol of cuprous acetate, 0.6mmol of oleic acid, 2mmol of dodecanethiol and 100mmol of octadecene, mix and heat to 50°C to dissolve completely. Raise the temperature to 100°C, inject 1 mL of octadecene solution (0.1 mol / L) dissolved with sulfur powder, and react for 60 minutes to generate a Cu-Zn-In-S structure nanocrystal nucleus solution.

[0042] Add 1 mL of zinc stearate octadecene solution (0.1 mol / L) and 1 mL of octadecene solution (0.1 mol / L) dissolved with sulfur powder into the above-mentioned nanocrystal nucleus solution with Cu-Zn-In-S structure. L), that is, a precursor containing sulfur ions, heated to 180° C. for 30 minutes, and coated with a ZnS shell on the surface of the nanocrystalline core. Then add methanol for in-situ purification. After the layers are separated, extract the methanol solution in the...

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Abstract

The invention discloses a nanocrystalline quantum dot with a core-shell structure and a preparation method of the nanocrystalline quantum dot. The method comprises the following steps: preparing a nanocrystalline core; and coating zinc sulfide in situ on the surface of the nanocrystalline core to acquire the nanocrystalline quantum dot with a core-shell structure, wherein the method further comprises a step of implementing in-situ purification on the nanocrystalline quantum dot before the step of coating zinc sulfide on the surface of the nanocrystalline core and/or further comprises a step of implementing in-situ purification on the nanocrystalline quantum dot after the step of coating zinc sulfide on the surface of the nanocrystalline core. Due to the method disclosed by the invention, the fluorescence efficiency of the nanocrystalline quantum dot with the core-shell structure and the stability of the air and the temperature are increased, and the adjustable luminescence wavelength window of the acquired nanocrystalline quantum dot is 500-700nm large. The method is easy to operate, low in cost and good in repeatability; and the acquired nanocrystalline quantum dot contains no toxic heavy metals, thereby satisfying the requirements on the applications in biological marking and biological monitoring and providing excellent luminescence materials for the aspects of illumination, solar energy and displays.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a nanocrystalline quantum dot with a core-shell structure and a preparation method thereof. Background technique [0002] Semiconductor nanocrystals, or quantum dots, have attracted widespread attention because of their obvious quantum size effect and unique optical properties, and their potential applications in lighting, display, solar energy, and biomarkers. In recent years, the development and application of quantum dots have mainly focused on cadmium-containing quantum dots (such as quantum dots with CdSe as the basic emission material). As we all know, cadmium is a highly toxic heavy metal. Big damage, so its application is strictly limited. Cadmium-free quantum dots are favored because they are green and non-toxic. [0003] At present, the research on cadmium-free quantum dots mainly focuses on I-III-VI / II-VI type quantum dots, III-V / II-VI type quantum d...

Claims

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Application Information

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IPC IPC(8): C09K11/62C09K11/70
Inventor 高静史维维郑斌赵飞
Owner NANJING TECH CORP LTD
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