Non-scintillation core-shell structure quantum dot and preparation method thereof

A core-shell structure and quantum dot technology, applied in the field of non-scintillation core-shell structure quantum dots and their preparation, can solve the problems of reduced device efficiency, unstable luminescence, loss of tracer targets, etc., and achieves uniform size distribution and stable fluorescence performance. , the effect of good monodispersity

Inactive Publication Date: 2018-05-18
HENAN UNIVERSITY
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Problems solved by technology

However, the fluorescence performance of the above-mentioned fluorescent quantum dots is poor in stability, and flickering behavior will appear during the application process, which seriously affects the effect of quantum dots in practical applications.
For example, the flickering of fluorescent quantum dots in the process of biological detection may cause the loss of tracer targets, and the flickering of fluorescent quantum dots in the application of electroluminescent devices will cause the reduction of device efficiency and unstable light emission, which greatly limits the use of fluorescent quantum dots. Applications

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  • Non-scintillation core-shell structure quantum dot and preparation method thereof
  • Non-scintillation core-shell structure quantum dot and preparation method thereof
  • Non-scintillation core-shell structure quantum dot and preparation method thereof

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preparation example Construction

[0036] The present invention also provides a method for preparing quantum dots with a non-blinking core-shell structure described in the above technical solution, comprising the following steps:

[0037] (1) mixing cadmium source, zinc source, fatty acid and phosphorus-free organic solvent, heating under anaerobic conditions to obtain cadmium and zinc mixed solution;

[0038] (2) Under anaerobic conditions, the mixed solution of elemental selenium and sulfur source is injected into the mixed solution of cadmium and zinc, and a nucleation reaction is carried out to obtain a compound containing Zn x Cd 1-x Se y S 1-y nucleosome mixture;

[0039] (3) under anaerobic conditions, the mixed solution of sulfur source and zinc source is added dropwise to the mixed solution obtained in the step (2), and the shell growth reaction is carried out to obtain non-scintillation core-shell structure quantum dots;

[0040] In the mixed solution of the sulfur source and the zinc source, the ...

Embodiment 1

[0059] Take 0.4mmol of zinc acetate, 0.1mmol of cadmium oleate, 2mmol of oleic acid and 20mL of liquid paraffin, mix them, raise the temperature to 290°C at a rate of 15°C / min under nitrogen protection, inject 0.25mmol of Se powder and 0.02mmol of octane mercaptan Mix the solution and react at 290°C for 30 minutes to obtain Zn-containing 0.8 Cd 0.2 Se 0.5 S 0.5A mixed solution of quaternary alloy quantum dot nuclei. Keep the crystal nucleus mixed solution at 290°C, drop the octadecene solution of zinc oleate and octaalkylmercaptan into the crystal nucleus mixed solution, the total volume is 60 ml; drop zinc oleate and octadecyl mercaptan according to the molar ratio of 1:1.5 Alkyl mercaptans were added dropwise with 30mmol zinc oleate and 45mmol octaalkyl mercaptans at a rate of 6mL / h, and Zn with different shell thicknesses were obtained at different times. 0.8 Cd 0.2 Se 0.5 S 0.5 / ZnS non-blinking core-shell quantum dots, with a total of 25 layers.

[0060] The corre...

Embodiment 2

[0066] Take 0.45mmol of zinc acetate, 0.05mmol of cadmium oleate, 2mmol of oleic acid and 20mL of liquid paraffin to mix, gradually raise the temperature to 280°C at a rate of 15°C / min under nitrogen protection, inject 0.15mmol of Se powder and 0.4mmol of hexaalkyl bidentate A mixed solution of mercaptans, followed by reaction at 280°C for 30min, to obtain Zn-containing 0.9 Cd 0.1 Se 0.3 S 0.8 A mixed solution of quaternary alloy quantum dot nuclei. Keep the crystal nucleus mixture at 280°C, drop zinc oleate and hexaalkyl bidentate mercaptan octadecene solution into the crystal nucleus mixture, with a total volume of 30 ml; drop zinc oleate in a molar ratio of 1:1.5 and hexaalkyl tridentate mercaptan, the total amount of dripping is 15mmol of zinc oleate, hexaalkyl tridentate mercaptan is 22.5mmol, and the rate of addition is 6mL / h, and Zn is obtained after 120min. 0.9 Cd 0.1 Se 0.3 S 0.8 / ZnS non-blinking core-shell quantum dots, with a total of 16 layers.

[0067] Te...

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Abstract

The invention provides a non-scintillation core-shell structure quantum dot. The non-scintillation core-shell structure quantum dot includes a core and a ZnS shell layer coated on the outer surface ofthe core; a chemical composition of the core is ZnxCd1-xSeyS1-y, wherein x is greater than 0 and smaller than 1, and y is greater than 0 and smaller than 1; the thickness of the shell layer is 0.7-10nm. The non-scintillation core-shell structure quantum dot has advantages of higher stability, higher quantum yield, good monodispersity, uniform size distribution and narrow full width at half maximum. Results of the embodiment of the non-scintillation core-shell structure quantum dot show that the quantum light state ratio of the non-scintillation core-shell structure quantum dot reaches 90-100%, the quantum yield is 60-100%, dimensional deviation can be controlled to be not more than 10%, the range of fluorescence spectrum is 480-560nm, and the full width at half maximum is 18-30nm.

Description

technical field [0001] The invention relates to the technical field of semiconductor functional materials, in particular to a non-scintillation core-shell quantum dot and a preparation method thereof. Background technique [0002] Fluorescent quantum dots have fluorescence properties with a narrow half-width of the emission peak, and have attracted extensive attention in the fields of biomolecular labeling, immunodetection, light-emitting diodes, lasers, and solar cells. For example, CdSe, ZnSe, ZnCdSe or ZnCdSeS are commonly used fluorescent quantum dots. However, the fluorescent performance of the above-mentioned fluorescent quantum dots is poor in stability, and flickering behavior may occur during application, which seriously affects the effect of quantum dots in practical applications. For example, the flickering of fluorescent quantum dots in the process of biological detection may cause the loss of tracer targets, and the flickering of fluorescent quantum dots in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88B82Y40/00B82Y20/00
CPCB82Y20/00B82Y40/00C09K11/02C09K11/883
Inventor 申怀彬王垒李昭涵吴瑞丽王洪哲李林松
Owner HENAN UNIVERSITY
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