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Core-shell quantum dots, preparation method and application thereof

A technology of core-shell quantum dots and quantum dots, which is applied in the field of core-shell quantum dots and its preparation, can solve the problems of poor size and morphology dispersion of core-shell quantum dots, and wide half-peak fluorescence.

Active Publication Date: 2020-06-12
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 dots, preparation method and application thereof
  • Core-shell quantum dots, preparation method and application thereof
  • Core-shell quantum dots, 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, its preparation method and its application. The preparation method includes: 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 core in the quantum dot core solution is greater than or equal to 2 times the quantum dot core When the minimum Bohr diameter of holes or electrons constituting the material is, add the second anion precursor solution and the second fatty acid to the second system at 210 to 280°C to perform epitaxial growth to obtain core-shell quantum dots, and the second anion Both the precursor solution and the second fatty acid are added in batches; or when the average diameter of the quantum dot cores in the quantum dot core solution is less than 2 times the minimum Bohr diameter, the precursor solution and the second fatty acid are added in batches to the second system at 210 to 280°C. Add the second anionic precursor solution to perform epitaxial growth. After the quantum dot core grows a single-layer shell of 0.5 to 2 layers, add the second fatty acid in batches to the second system.

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 Patents(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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