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Quantum dots and preparation method thereof

A technology for quantum dots and atoms, applied in the field of quantum dots and their preparation, can solve the problems of limiting the use of quantum dots, performance degradation such as fluorescence quantum yield, and low thermal stability of quantum dots, achieving good luminescence performance and improving thermal stability. The effect of improving the fluorescence efficiency

Active Publication Date: 2018-12-14
SUZHOU XINGSHUO NANOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Quantum dots synthesized by existing technologies, when working in a high-temperature environment, performance such as fluorescence quantum yield will decrease, and the thermal stability of quantum dots is low, which limits the use of quantum dots

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of quantum dot 1:

[0034] 1) Under an inert gas atmosphere, make 0.2mmol CdO, 4mmol Zn(OAc) 2, 5mL oleic acid, 15mL 1-octadecene, and 1.5mL selenium tri-n-octylphosphine (2M) were mixed, and a known method was used to prepare CdZnSe quantum dots at 320°C and coat the ZnS shell;

[0035] 2) Add 5 g of oleic acid amide to the reaction system of step 1), and react at 200° C. for 1 hour to combine oleic acid amide with CdZnSe / ZnS quantum dots;

[0036] Through the above steps, CdZnSe / ZnS quantum dots 1 modified with oleic acid amide ligands were obtained.

Embodiment 2

[0038] Preparation of quantum dot 2:

[0039] 1) Under an inert gas atmosphere, make 0.2mmol CdO, 4mmol Zn(OAc) 2 , 5mL of oleic acid, 15mL of 1-octadecene, 1.5mL of selenium and sulfur tri-n-octylphosphine (2M) were mixed, using a known method to prepare CdZnSeS quantum dots at 320 ° C and coat the CdSe / ZnS shell;

[0040] 2) Add 5 g of stearamide to the reaction system of step 1), and react at 300° C. for 1 h to combine stearamide with CdZnSeS / CdSe / ZnS quantum dots;

[0041] Through the above steps, stearylamide ligand-modified CdZnSeS / CdSe / ZnS quantum dots 2 were obtained.

Embodiment 3

[0043] Preparation of quantum dots 3:

[0044] 1) In an inert gas atmosphere, mix 4mmol of zinc stearate, 2mmol of selenium powder, 2mL of trioctylamine, 15mL of 1-octadecene, and 1mL of selenium-octadecene (0.1M), and use a known method at 320°C Prepare ZnSe quantum dots and coat ZnSe shell;

[0045] 2) Add 4g of myristylamide to the reaction system of step 1), and react at 240° C. for 1 hour to combine myristylamide with ZnSe / ZnS quantum dots;

[0046] Through the above steps, the ZnSe / ZnS quantum dots 3 modified by the tetradecamide ligand were obtained.

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Abstract

The invention relates to quantum dots and a preparation method thereof. Surfaces of the quantum dots are bound with a rigid ligand, and the rigid ligand is coordinately bound with metal atoms on the surfaces of the quantum dots. The structural formula of the rigid ligand is R1-CONH-R2, wherein R1 is C6-C18 alkyl, R2 is H atom, or R2 is C6-C18 alkyl. According to the quantum dots and the preparation method thereof, because motion activity of a rigid chain is lower, the rigid ligand cannot fall off the surfaces of the quantum dots by violent motion even in a higher temperature environment, and thermal stability of the quantum dots is significantly improved.

Description

technical field [0001] The application belongs to the technical field of quantum dots, and in particular relates to a quantum dot and a preparation method thereof. Background technique [0002] Based on quantum effects and luminescent properties, quantum dots have broad application prospects in lighting, display, life science, fluorescent labeling, solar cells, and photocatalysis. With the development of quantum dot synthesis technology, the requirements for quantum dots in the application field are getting higher and higher. [0003] The quantum dots synthesized in the prior art, when working in a high-temperature environment, the performance such as fluorescence quantum yield will decrease, and the thermal stability of the quantum dots is low, which limits the use of the quantum dots. Contents of the invention [0004] In view of the above problems existing in the existing quantum dots, the present invention provides a quantum dot with high thermal stability and a prepa...

Claims

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Application Information

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IPC IPC(8): C09K11/02
CPCC09K11/025
Inventor 王允军李鑫
Owner SUZHOU XINGSHUO NANOTECH CO LTD
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