Preparation method of quantum dots

A quantum dot, molar mass technology, applied in chemical instruments and methods, nanotechnology, nano-optics, etc., can solve the problems of few surface ligands and poor solubility, and achieve the effect of good monodispersity and uniform particle size.

Pending Publication Date: 2020-04-17
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing nanocrystals with a core-shell structure, aiming at solving the problem that the quantum dots with a core-shell structure prepared in the prior art by continuously injecting and growing shell-source precursors have less ligands on the surface and are difficult to dissolve. bad sex problem

Method used

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preparation example Construction

[0015] An embodiment of the present invention provides a method for preparing quantum dots with a core-shell structure, comprising the following steps:

[0016] S01. providing an initial quantum dot core, mixing the initial quantum dot core with an organic carboxylic acid, so that the organic carboxylic acid is bound to the surface of the initial quantum dot core;

[0017] S02. Prepare a shell on the surface of the initial quantum dot core, wherein the step of preparing a shell on the surface of the initial quantum dot core is carried out in a shell growth reaction system containing an organic carboxylic acid;

[0018] S03. The solution system after the shell growth reaction is completed is mixed with the organic amine and heated;

[0019] Or mix and heat the system after the shell growth reaction is completed with organic phosphine;

[0020] Or mix the solution system after the shell growth reaction is completed with the mixed solution of organic amine and organic phosphine ...

Embodiment 1

[0058] A preparation method of quantum dots, comprising the following steps:

[0059] 1. Preparation of cadmium selenide (CdSe) initial quantum dot cores,

[0060] 11) Preparation of cadmium precursor: Take 0.25mmol of CdO, 0.5mmol of octadecylphosphonic acid, and 3g of trioctylphosphine oxide and add them together into a 50ml three-necked flask, heat to 380°C and dissolve to make it clear and transparent solution and maintained at this temperature;

[0061] 12) Preparation of Se precursor: Take 0.5 mmol of Se source solution and stir in 1 ml of trioctylphosphine at room temperature until clear and set aside;

[0062] 13) Preparation of CdSe initial quantum dots: Before injecting the Se precursor, inject 1ml of trioctylphosphine solution into 11), and when the temperature of the solution returns to 380°C, inject the Se precursor to react for 30s, and then inject 10ml The octadecene quenching reaction is cleaned after being cooled to room temperature;

[0063] 14) Cleaning a...

Embodiment 2

[0074] A method for preparing quantum dots with a core-shell structure, comprising the following steps:

[0075] 1. The preparation of CdS initial quantum dot core is as follows:

[0076] 11) Cadmium oleate {Cd(OA) 2} Preparation of precursors,

[0077] Add cadmium oxide (CdO) 1mmol, oleic acid (OA) 4ml, octadecene (ODE) 10ml into the three-necked flask, first vacuumize at room temperature for 30mins, then heat to 180°C and exhaust argon for 60mins, then maintain 180°C and vacuumize for 30mins , cooled to room temperature for later use;

[0078] 12) Preparation of selenium (Se) precursor: add 10mmol of Se to 10ml of trioctylphosphine oxide (TOP), heat to 170°C for 30min, then cool down to 140°C;

[0079] 13) Preparation of sulfur (S-TOP) precursor: Add 20mmol of S to 10ml of trioctylphosphine oxide (TOP), heat to 170°C for 30min, then cool down to 140°C;

[0080] 14) Preparation of sulfur (S-ODE) precursor: Weigh 5mmol of S and add it to 10ml of octadecene (ODE), heat to 1...

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Abstract

The invention provides a preparation method of quantum dots. The preparation method comprises the following steps: providing an initial quantum dot core, and mixing the initial quantum dot core and anorganic carboxylic acid to combine the organic carboxylic acid to the surface of the initial quantum dot core; preparing a shell layer on the surface of the initial quantum dot core, wherein the stepfor preparing the shell layer on the surface of the initial quantum dot core is carried out in a shell layer growth reaction system containing an organic carboxylic acid; mixing the solution system after the shell growth reaction and an organic amine, and complexing the organic amine and the residual cationic precursor shell; or mixing the system after the shell growth reaction and organic phosphine, and heating; or mixing the solution system after the shell growth reaction and a mixed solution of an organic amine and organic phosphine, and heating.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanocrystalline materials, and in particular relates to a preparation method of quantum dots. Background technique [0002] Nanoscience and nanotechnology are emerging science and technology and have potential application value and economic benefits, so they have attracted the attention of scientists all over the world. Compared with bulk materials, nanocrystals (NCs) can exhibit electrical, optical, magnetic, and electrochemical properties that bulk materials do not possess. Semiconductor nanocrystals, also known as quantum dots (QD), range in size from 1 to 20nm. When the particle size changes, the bandgap valence band and conduction band of semiconductor nanocrystals will also change (quantum size effect), such as CdSe The absorption and emission of nanocrystals cover almost the entire visible spectral range, thus, semiconductor nanocrystals exhibit the phenomenon of size-dependent phot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88C09K11/02B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/02C09K11/883
Inventor 程陆玲杨一行
Owner TCL CORPORATION
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