A kind of synthesis method of acid-assisted preparation of cdse/cds/zns core-shell structure quantum dots

A core-shell structure and synthesis method technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of unfavorable quantum dot emission wavelength, large environmental pollution, red shift of quantum dot emission wavelength, etc. The effect of simple coating method and few kinds of raw materials

Inactive Publication Date: 2016-08-24
HUBEI UNIV
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  • Application Information

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Problems solved by technology

In the oleic acid paraffin system, the reaction temperature is low, but in order to avoid the growth of the core during the cladding process, the cladding Cd source often chooses highly active inorganic cadmium as the Cd source, so that the shell material can react at low temperature. In the epitaxial growth of the core, and to avoid the growth of the core, this method requires many types of raw materials, and the excess cadmium oleate in the core preparation process cannot be fully utilized, which increases the waste of cadmium, causes great environmental pollution, and cladding reaction time Long, the emission wavelength of quantum dots after encapsulation appears red-shifted, which is not conducive to controlling the emission wavelength of quantum dots after encapsulation

Method used

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  • A kind of synthesis method of acid-assisted preparation of cdse/cds/zns core-shell structure quantum dots
  • A kind of synthesis method of acid-assisted preparation of cdse/cds/zns core-shell structure quantum dots
  • A kind of synthesis method of acid-assisted preparation of cdse/cds/zns core-shell structure quantum dots

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Embodiment 1

[0027] The quantum dots with core-shell structure synthesized in this example use cadmium selenide as the core nanocrystal, and the core quantum dot solution is epitaxially grown in an organic system with the aid of an organic acid to obtain inorganic shells of cadmium sulfide and zinc sulfide. The size of the obtained core-shell structure quantum dot is 4-6 nm, and the emission peak is 540 nm.

[0028] The core CdSe nanocrystals were prepared in the paraffin-oleic acid system by a general method, which is briefly described as follows:

[0029] 1. Preparation of Precursors

[0030] a) Add CdO (0.256g), oleic acid (2ml), and liquid paraffin (8ml) into a reaction vessel, heat to 180°C while stirring until the cadmium oxide dissolves into a golden yellow liquid, cool to room temperature, and use as CdSe Precursors of Cd in the core and CdS shell;

[0031] b) Mix and heat sulfur powder (0.064g) and liquid paraffin (10ml) to 120°C to obtain a clear and transparent solution, which...

Embodiment 2

[0043] The quantum dots with core-shell structure synthesized in this example use cadmium selenide as the core nanocrystal, and the core quantum dot solution is epitaxially grown in an organic system with the aid of an organic acid to obtain inorganic shells of cadmium sulfide and zinc sulfide. The size of the obtained core-shell structure quantum dot is 4-6 nm, and the emission peak is 576 nm. In this embodiment, an inert atmosphere is used for protection.

[0044] The core CdSe nanocrystals were prepared in the paraffin-oleic acid system by a general method, which is briefly described as follows:

[0045] 1. Preparation of Precursors

[0046] a) Add CdO (0.256g), oleic acid (2ml) and liquid paraffin (8ml) into the reaction vessel, slowly pass nitrogen gas while stirring, heat to 180°C until the cadmium oxide dissolves into a golden yellow liquid, cool to Room temperature, as the precursor of Cd in CdSe core and CdS shell;

[0047] b) Mix and heat sulfur powder (0.064g) an...

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Abstract

The invention discloses an acid-assisted synthesis method for preparing CdSe / CdS / ZnS core-shell structure quantum dots. The steps are: synthesize CdSe core quantum dot solution in paraffin oleic acid system, then use cadmium oleate as the precursor of shell CdS, sulfur source dissolved in liquid paraffin as the precursor of shell CdS and ZnS, dissolve in The zinc source of liquid paraffin is used as the precursor of the shell ZnS. Add an organic acid to the S precursor and add it dropwise to the core quantum dot solution. The organic acid enhances the activity of the shell precursor and reduces the surface ligands of the core quantum dots. , promote the growth of CdS shell on the surface of CdSe core quantum dots, and achieve epitaxial coating. Then the precursor of Zn is added dropwise to coat the ZnS shell layer to obtain a CdSe / CdS / ZnS core-shell structure quantum dot solution. The invention has the advantages that it can be synthesized under the atmospheric atmosphere without a phosphine system, the raw material is cheap, the reaction temperature is low, the shell layer grows fast, the operation is simple, and it is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of nanomaterials for photoelectric display lighting, in particular to an acid-assisted surface passivation to prepare quantum dots with a core-shell structure and a preparation method thereof. Background technique [0002] CdSe quantum dots are a kind of semiconductor nanocrystals with excellent optical properties, and their luminescent wavelength can be adjusted with the change of their size, covering the entire visible light range. They are widely used in LEDs, solar cells, photocatalysis, bioluminescent marking, lasers and other fields. At present, due to the dangling bonds and defects on the surface of the single CdSe quantum dots, the probability of non-radiative transition is increased, which makes the luminous efficiency of CdSe quantum dots low and unstable. In order to improve the luminous efficiency and stability of CdSe quantum dots, the researchers epitaxially grown an inorganic shell layer on i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/88C09K11/02
Inventor 曹万强刘培朝陈威王恺周超周凤丽
Owner HUBEI UNIV
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