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Core-shell quantum dot, and preparation method and application thereof

A core-shell quantum dot and a technology for quantum dots are applied in the field of preparation of core-shell quantum dots, and can solve the problems of poor size and morphology dispersion of core-shell quantum dots, large fluorescence half-peak width, etc.

Active Publication Date: 2018-01-26
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The main purpose of the present invention is to provide a core-shell quantum dot, its preparation method and its application, so as to solve the problems of poor size and morphology dispersion and large fluorescence half-peak width of core-shell quantum dots in the prior art

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  • Core-shell quantum dot, and preparation method and application thereof
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  • Core-shell quantum dot, and preparation method and application thereof

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preparation example Construction

[0058]In a typical embodiment of the present application, a method for preparing core-shell quantum dots is provided, including: step S1, mixing the quantum dot core solution and the second cation precursor solution to form a second system; step S2, When the average diameter of the quantum dot nucleus in the quantum dot nucleus solution is greater than or equal to 2 times the minimum Bohr diameter of holes or electrons of the quantum dot nucleus constituent material, add the second anion to the second system at 210-280°C The precursor solution and the second fatty acid are used for epitaxial growth to obtain core-shell quantum dots, and the second anion precursor solution and the second fatty acid are added in batches to form a second product system; or, when the quantum dots in the quantum dot core solution When the average diameter of the dot core is less than 2 times the minimum Bohr diameter of holes or electrons of the quantum dot core constituent material, the second anio...

Embodiment 1

[0105] Synthesis of spherical CdSe quantum dots (average diameter 3.3nm) with the first exciton absorption peak at 550nm: CdO (0.0256g, 0.2mmol), HSt (stearic acid, 0.1420g, 0.5mmol) and ODE (octadecene , 4mL) into a 25mL three-neck flask, stirred for 10 minutes with argon, then heated up to 280°C to obtain a clear solution, then cooled to 250°C. 1 mL of selenium powder suspension with a concentration of 0.1 mmol / mL was quickly injected into the above-mentioned three-necked flask, and the reaction temperature was controlled at 250°C. After reacting for 7 minutes, quickly inject 0.05 mL of 0.1 mmol / mL selenium powder suspension into the three-necked bottle every 2 to 3 minutes until the size of the quantum dots reaches the target size, and stop heating immediately. During the reaction, the ratio of the total substance amount of the first cation precursor (Cd) to the total substance amount of the first anion precursor (Se) is 1:0.75. During the reaction process, a certain amoun...

Embodiment 2

[0109] Synthesis of spherical CdSe (average diameter 4.2nm) quantum dots with the first exciton absorption peak at 590nm: put CdO (0.0256g, 0.2mmol), tetradecanoic acid (0.1026g, 0.45mmol) and ODE (4mL) into 25mL In the three-necked flask, after stirring and ventilating for 10 minutes, the temperature was raised to 280° C. to obtain a clear solution, and the temperature was controlled at 250° C. Rapidly inject 1 mL of selenium powder suspension with a concentration of 0.05 mmol / mL into the three-neck flask, and control the reaction temperature at 240°C. After reacting for 5 minutes, add 0.1mL selenium powder concentration is 0.1mmol / mL and contain the selenium powder suspension of 1mmol / mL oleic acid with the speed of 0.9mL / h, drip the above-mentioned selenium powder suspension containing 1mmol / mL oleic acid After the cloudy liquid, continue to react for 5 minutes. Then add the above-mentioned selenium powder suspension again, and circulate successively until the size of the ...

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Abstract

The invention provides a core-shell quantum dot, and a preparation method and an application thereof. The preparation method comprises the following steps: 1, mixing a quantum dot core solution with asecond cationic precursor solution to form a second system; 2, adding a second cationic precursor solution and second fatty acid into the second system in batches at 210-280 DEG C when the average diameter of quantum dot cores in the quantum dot core solution is more than or equal to 2 times the minimum Bohr diameter of holes or electrons of a quantum dot core composition material to carry out epitaxial growth in order to obtain the core-shell quantum dot; or adding the second cationic precursor solution into the second system in batches at 210-280 DEG C when the average diameter of the quantum dot cores in the quantum dot core solution is less than 2 times the minimum Bohr diameter to carry out epitaxial growth, and adding the second fatty acid into the second system in batches after 0.5to 2 layers of a monolayer shell grow on every quantum dot core.

Description

technical field [0001] The invention relates to the field of quantum dot synthesis, in particular to a core-shell quantum dot, its preparation method and its application. Background technique [0002] Among all nanomaterials, solution semiconductor nanocrystals (solution quantum dots) with sizes in the quantum confinement size range are known for their excellent optical properties, such as high fluorescence quantum yield, absorption bandwidth, narrow emission peak, and good optical stability. , has aroused widespread concern in the scientific and industrial circles. In the fields of biolabeling and imaging, light-emitting diodes, lasers, and quantum dot photovoltaic devices, quantum dot research has become one of the hotspots in their respective fields. In fields that affect people's daily life such as display (quantum dot backlight TV), lighting, etc., quantum dots have been initially applied in practice. Especially in the field of display, compared with organic fluoresce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88H01L51/50H01L51/00H10K99/00
Inventor 彭笑刚周健海苏叶华
Owner ZHEJIANG UNIV
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