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A preparation method of multi-quantum dot core-silica shell composite structure and its application in LED

A technology of silica and composite structure, applied in chemical instruments and methods, nanotechnology for materials and surface science, semiconductor devices, etc., can solve problems such as quantum dot fluorescence efficiency decay, and achieve the effect of avoiding reabsorption

Active Publication Date: 2019-03-05
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, quantum dots will be affected by the surrounding medium to agglomerate, which will lead to the attenuation of quantum dot fluorescence efficiency

Method used

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  • A preparation method of multi-quantum dot core-silica shell composite structure and its application in LED
  • A preparation method of multi-quantum dot core-silica shell composite structure and its application in LED
  • A preparation method of multi-quantum dot core-silica shell composite structure and its application in LED

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Synthesis of oil-soluble CZIS / ZnS quantum dots:

[0032] 0.02mmol or 0.1mmol of CuCl, 0.4mmol of Zn(OAc) 2 , 0.4mmol of In(OAc) 3 , 3.2 mmol of S, 8 mL of DDT, 4 mL of OAm, and 2 mL of OA were added into a three-necked flask. After degassing at 100°C for 20 min, the mixture was heated to 230°C under nitrogen. After 10 min, the reaction was quenched. The reaction mixture was cooled to 80°C, and the OAm and ODE dissolved Zn(OAc) 2 Solution (the solution is 0.8mmol Zn(OAc) 2 OAm and ODE dissolved in 2 mL (the volume ratio of OAm and ODE is 1:9) were added to the above mixture, and the ZnS shell was grown on the CZIS core in situ. Then, the temperature of the system was raised to 240° C. for 20 minutes. The reaction was quenched by adding toluene.

[0033] (2) Preparation of multi-quantum dot core-silica shell composite structure (CZIS / ZnS QDs@SiO 2 structure): the experiment encapsulated multiple CZIS / ZnS quantum dots into SiO by inverse microemulsion method 2...

Embodiment 2

[0036] (1) Synthesis of oil-soluble CZIS / ZnS quantum dots:

[0037] 0.02mmol or 0.1mmol of CuCl, 0.4mmol of Zn(OAc) 2 , 0.4mmol of In(OAc) 3 , 3.2 mmol of S, 8 mL of DDT, 4 mL of OAm, and 2 mL of OA were added into a three-necked flask. After degassing at 100°C for 20 min, the mixture was heated to 230°C under nitrogen. After 10 min, the reaction was quenched. The reaction mixture was cooled to 80°C, and the OAm and ODE dissolved Zn(OAc) 2 Solution (the solution is 0.8mmol Zn(OAc) 2 OAm and ODE dissolved in 2 mL (the volume ratio of OAm and ODE is 1:9) were added to the above mixture, and the ZnS shell was grown on the CZIS core in situ. Then, the temperature of the system was raised to 240° C. for 20 minutes. The reaction was quenched by adding toluene.

[0038] (2) Preparation of CZIS / ZnS QDs@SiO 2 The structure of the experiment: multiple CZIS / ZnS quantum dots were encapsulated into SiO by the method of inverse microemulsion 2 in the ball. 1 g of Igepal CO-520, 20...

Embodiment 3

[0041] (1) Synthesis of oil-soluble CZIS / ZnS quantum dots:

[0042] 0.02mmol or 0.1mmol of CuCl, 0.4mmol of Zn(OAc) 2 , 0.4mmol of In(OAc) 3 , 3.2 mmol of S, 8 mL of DDT, 4 mL of OAm, and 2 mL of OA were added into a three-necked flask. After degassing at 100°C for 20 min, the mixture was heated to 230°C under nitrogen. After 10 min, the reaction was quenched. The reaction mixture was cooled to 80°C, and the OAm and ODE dissolved Zn(OAc) 2 Solution (the solution is 0.8mmol Zn(OAc) 2 OAm and ODE dissolved in 2 mL (the volume ratio of OAm and ODE is 1:9) were added to the above mixture, and the ZnS shell was grown on the CZIS core in situ. Then, the temperature of the system was raised to 240° C. for 20 minutes. The reaction was quenched by adding toluene.

[0043] (2) Preparation of CZIS / ZnS QDs@SiO 2 The structure of the experiment: multiple CZIS / ZnS quantum dots were encapsulated into SiO by the method of inverse microemulsion 2 in the ball. 1 g of Igepal CO-520, 20...

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PUM

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Abstract

The invention relates to a preparation method of a multi-quantum dot core-silica shell composite structure and its application in LEDs. A multi-surface modifier is synthesized by using oleic acid, dodecyl mercaptan, and oleylamine multi-chemical reagent modification. Cu-doped Zn‑In‑S quantum dot structure. Quantum dot structures with different emission fluorescence were synthesized by controlling and changing the amount of Cu doping. Wrap multiple quantum dot structures into tens of nanometers of silica spheres in a liquid phase environment, and place the composite structure on the surface of a GaN chip, and successfully obtain a color-tunable quantum dot LED. In addition, The wider emission peak of doped quantum dots is also conducive to the realization of quantum dot white LEDs.

Description

technical field [0001] The invention belongs to the field of composite nano-probes, and in particular relates to a preparation method of a multi-quantum dot core-silicon dioxide shell composite structure and its application in LEDs. Background technique [0002] Quantum dots are nanocrystalline clusters composed of hundreds to thousands of atoms. The size of quantum dots is smaller than or close to its excitonic Bohr radius, has quantum confinement effect, exhibits excellent optical properties, and can emit multicolor fluorescence. Based on their excellent fluorescent properties, quantum dots have been widely used in industry and become a hot spot in the research of nanomaterials. In the lighting industry, white LEDs based on GaN chips occupy a large market. Therefore, the inventor of GaN blue LEDs was awarded the Nobel Prize in 2014. [0003] Currently, white LEDs are still composed of yellow-emitting YAG:Ce3+ phosphors combined with blue-emitting GaN. However, some forw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/62C09K11/59B82Y30/00B82Y40/00H01L33/50
CPCB82Y30/00B82Y40/00C09K11/025C09K11/592C09K11/623H01L33/502
Inventor 吴明在蒋童童
Owner ANHUI UNIVERSITY
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