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A preparation method of large-scale core-shell structure quantum dots

A core-shell structure and quantum dot technology, which is applied in the field of luminescent quantum dot materials, can solve the problem that the particle size and yield of quantum dots are difficult to maintain at a high level, and achieve the effect of continuous growth and avoidance of influence.

Active Publication Date: 2020-01-17
HENAN UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing quantum dots with a large-size core-shell structure. The preparation method provided by the present invention can solve the problem that the particle size and yield of quantum dots in the prior art are difficult to maintain at a relatively high level, and obtain 15-60nm, and large-size quantum dots with a yield of more than 50%

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  • A preparation method of large-scale core-shell structure quantum dots
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  • A preparation method of large-scale core-shell structure quantum dots

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preparation example Construction

[0026] The invention provides a method for preparing quantum dots with a large-scale core-shell structure, comprising the following steps:

[0027] Under a protective atmosphere, the dispersion liquid of the shell layer source is added dropwise to the core body dispersion liquid by dropping at intervals, and the core-shell structure quantum dots are obtained through in-situ growth.

[0028] In the present invention, the protective atmosphere is preferably nitrogen, and the present invention has no special requirements on the specific way of providing the protective atmosphere, and a method well known to those skilled in the art can be used.

[0029] In the present invention, the dropwise addition of the dispersion liquid of the same kind of shell source is continuous dripping. When replacing the dispersion liquid of different seed shell sources, a certain time interval is required so that the previous shell source can fully grow. In the present invention, the interval time is ...

Embodiment 1

[0068] Take 6×10 -7 mmol, CdSe quantum dots with a particle size of 2.7nm were added to the mixed dispersion of 6mL octadecene and 6mL oleylamine, and the temperature was raised to 300°C at a rate of 8°C / min under nitrogen protection, and oil was added dropwise to the nucleus dispersion. Octadecene dispersion of cadmium oleate and sulfur powder, the total volume is 30mL, the concentration of cadmium oleate in the dispersion is 0.08mmol / mL, the molar ratio of cadmium in cadmium oleate to sulfur powder is 1:1, zinc oleate Calculated by zinc ions; the dropping rate is 6mL / h, after the dropping reaction is completed, CdSe / CdS core-shell structure quantum dots are obtained, and the number of shell layers is 7 layers; grow in situ for 15min, then drop zinc oleate and oleic acid into the dispersion The mixture of cadmium and octaalkylmercaptan is 60mL, the concentrations of zinc oleate and cadmium oleate are both 0.1mmol / mL, the ratio of zinc oleate and cadmium oleate is 1:1, and the...

Embodiment 2

[0070] Take 5×10 -7 mmol, CdSe quantum dots with a particle size of 3.1nm, added to the mixed dispersion of 6mL octadecene and 3g octadecylamine, heated to 280°C at a rate of 10°C / min under the protection of nitrogen, and dropped into the nucleus dispersion Octadecene dispersion of zinc oleate and sulfur powder, the total volume is 15mL, the concentration of cadmium oleate in the dispersion is 0.1mmol / mL, the molar ratio of cadmium in oleate cadmium to sulfur powder is 1:1, oleic acid Zinc is calculated as zinc ion; the dropping rate is 6mL / h, after the dropping reaction is completed, CdSe / ZnS core-shell structure quantum dots are obtained, and the number of shell layers is 4 layers; the in-situ growth is 10min; then zinc oleate, oil The mixture of cadmium oleate and cadmium oleate is 80mL, the concentrations of zinc oleate and cadmium oleate are both 0.1mmol / mL, the ratio of zinc oleate and cadmium oleate is 1:1, and oleic acid cadmium is oleic acid 1.2 times the molar sum o...

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Abstract

The invention belongs to the technical field of luminescent quantum dot materials and particularly relates to a preparation method of a large-size core-shell structured quantum dot. The preparation method comprises steps as follows: a dispersion liquid of a shell source is added to a dispersion liquid of a core in a mode of dropwise adding at intervals in a protective atmosphere, and the core-shell structured quantum dot is obtained through in-situ growth. With the adoption of the mode of dropwise adding at intervals, matching from the inner layer of shell components to crystal lattices of themiddle layer is realized, influence of lattice imperfection on quantum yield is avoided, continuous growth of the shell is realized, and the core-shell structured quantum dot with large size and highyield is obtained finally. A result of an embodiment indicates that when the core-shell structured quantum dot with grain size being 15 nm is prepared with the method, the yield is as high as 80%; when the core-shell structured quantum dot with the grain size being 60 nm is prepared, the yield still keeps 50% or higher.

Description

technical field [0001] The invention belongs to the technical field of luminescent quantum dot materials, and in particular relates to a preparation method of large-scale core-shell structure quantum dots. Background technique [0002] Due to the outstanding absorption and light-emitting properties of semiconductor nanocrystals (also known as quantum dots), these materials have attracted extensive research interest from domestic and foreign researchers in the fields of optoelectronic devices, biomedicine, and fluorescent labels, and have been used in light-emitting devices. Outstanding progress has been made in research fields such as solar cells and biomarkers. In particular, fluorescent semiconductor nanocrystals have outstanding advantages such as narrow emission half-peak width, high color purity, large spectral coverage, high luminous efficiency, good stability, and different colors can be produced at the same time when excited by a light source. Compared with tradition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/88B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/02C09K11/881C09K11/883
Inventor 申怀彬胡宁吴瑞丽吕雁冰李林松
Owner HENAN UNIVERSITY
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