Preparation method of near-spherical CdZnS/CdSe/CdZnS quantum well with high fluorescence quantum yield

A fluorescent quantum yield and quantum well technology, applied in chemical instruments and methods, nano optics, luminescent materials, etc., can solve problems such as unwanted interaction of nanocrystals, color changes, etc., and achieve the effect of improving the fluorescent quantum yield

Inactive Publication Date: 2019-02-22
LINGNAN NORMAL UNIV
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Problems solved by technology

Furthermore, in mixed-sized nanocrystal assemblies, energy transfer may lead to unwanted interactions between nanocrystals, resulting in color changes

Method used

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  • Preparation method of near-spherical CdZnS/CdSe/CdZnS quantum well with high fluorescence quantum yield
  • Preparation method of near-spherical CdZnS/CdSe/CdZnS quantum well with high fluorescence quantum yield

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Embodiment

[0025] (1) First synthesize CdZnS core material, cadmium oxide CdO and anhydrous zinc acetate Zn(Ac) 2 As raw materials for Cd and Zn sources, the molar ratio Zn:Cd=10:1, 0.5mmol CdO (0.064g) and 5mmol Zn(Ac) in a three-necked flask 2 (0.917g) mixed with 5ml oleic acid OA, heated up to 150°C to form zinc oleate and cadmium oleate, during which vacuum was pumped for 40 minutes. Ensure that the vacuum is complete; then fill with argon, inject 10ml octadecene 1-ODE under argon atmosphere, heat to 300°C, inject 1.1mmol S source when the temperature reaches 300°C (high-purity sulfur dissolved in octadecene 1- ODE), the reaction temperature was raised to 310°C in the last 12 minutes, at this time, the heating mantle was removed after the reaction was completed and the temperature was lowered to form the CdZnS core material;

[0026](2) Before the synthesis of the final material, it is essential to purify the CdZnS synthesized in (1) to remove excess Zn elements and other impurities...

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Abstract

The invention relates to a preparation method of a near-spherical CdZnS / CdSe / CdZnS quantum well with high fluorescence quantum yield, and belongs to the technical field of preparation of nanocrystal materials. The preparation method specifically comprises the following steps: preparing CdZnS nuclear quantum dots of which the particle diameter is about 4.0nm through a high-temperature hot injectionmethod, mixing CdZnS quantum dot precipitate with a corresponding ligand solvent, and dropwise adding a certain amount of mixed precursor of positive ions and negative ions at a certain speed througha continuous ionic layer adsorption method, thus preparing CdSe cladded CdZnS / CdSe quantum dots of which the shell layer thickness is 0.7nm; continuously and dropwise adding the mixed precursor of the positive ions and the negative ions, thus synthesizing a CdZnS / CdSe / CdZnS quantum dot quantum well. According to the preparation method disclosed by the invention, the lattice fit degree between a CdZnS core and a CdSe luminescent layer can be relieved, a CdSe coherent strain layer can be well crystallized, and the fluorescence quantum yield of traditional core-shell structure quantum dots can be effectively improved; due to the prepared CdZnS / CdSe / CdZnS quantum dot quantum well, surface defects of the CdSe luminescent layer can be well modified by a thick shell layer, and finally, the luminescence efficiency can be up to 100 percent.

Description

technical field [0001] The invention relates to a preparation method of a quantum well, in particular to a preparation method of a high fluorescence quantum yield and approximately spherical CdZnS / CdSe / CdZnS quantum well, which belongs to the technical field of nanocrystalline material preparation. Background technique [0002] Colloidal semiconductor nanocrystals have narrow luminescence spectra and high photoluminescence quantum yields, and have attracted extensive attention for applications in displays, lasers, and solar cells. It is now possible to synthesize such high-quality nanocrystals, in which organic ligands are bound to the surface of the nanocrystals, making them size-tunable and solution-processable. However, the bonding between organic ligands and surface atoms of nanocrystals is relatively weak, resulting in low fluorescence quantum yield, which inevitably reduces the optical properties of nanocrystals. [0003] However, when the traditional core-shell struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/02B82Y20/00B82Y40/00
CPCC09K11/883B82Y20/00B82Y40/00C09K11/02
Inventor 张婷婷白锦科徐兵李栋宇
Owner LINGNAN NORMAL UNIV
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