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Cadmium-free core-shell quantum dot and preparation method thereof

A core-shell quantum dot and a technology for quantum dots, which are applied to the field of cadmium-free core-shell quantum dots and their preparation, can solve the problems of inability to effectively reduce the half-peak width, large lattice mismatch, limited improvement in fluorescence efficiency, etc., and achieve easy control. , Simple operation, realize the effect of industrialization

Inactive Publication Date: 2017-05-10
TCL CORPORATION
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Problems solved by technology

[0004] The object of the present invention is to provide a kind of cadmium-free core-shell quantum dots and its preparation method, aiming to solve the existing preparation method of cadmium-free quantum dots, due to the adoption of a growth process to form a passivation shell, the gap between the quantum dot shell and the core There is no corresponding transition shell, resulting in a large lattice mismatch between the shell and the core, the improvement of its fluorescence efficiency is limited, and the half-peak width cannot be effectively reduced

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  • Cadmium-free core-shell quantum dot and preparation method thereof

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preparation example Construction

[0032] Correspondingly, the embodiment of the present invention also provides a method for preparing cadmium-free core-shell quantum dots, comprising the following steps:

[0033] S01. Preparation of quantum dot cores: providing nuclear cation precursors and nuclear anion precursors to prepare quantum dot cores;

[0034] S02. Prepare a gradient transition layer: add the quantum dot core, ligand reagent and solvent into the reaction vessel, and heat up to 120-300° C. after exhaust treatment;

[0035] Add nuclear cation precursors and nuclear anion precursors into the reaction vessel for the first reaction; follow this method for the second reaction in sequence... Nth 1 reaction, with the increase of the number of reactions, the molar amount of the nuclear cation precursor and / or the nuclear anion precursor gradually decreases, and the molar ratio of the nuclear cation precursor and the nuclear anion precursor is less than the specified The molar ratio of corresponding elements...

Embodiment 1

[0054] a CuInS 2 / Cu x In 1-x S 2 / Cu x Zn 1-x S 2 The preparation method of / ZnS cadmium-free core-shell quantum dot comprises the following steps:

[0055] S11. Extract 4ml of copper oleate containing indium oleate and 2ml and inject it into another three-necked flask and heat it to 180°C, then extract 0.2mmol of octamercaptan (OT) and inject it rapidly into the flask containing indium oleate and oil In the flask of acid-copper mixed solution, react for 3 minutes, and when the color of the mixed solution changes from green to blue and finally to yellow, extract 0.6 mmol of S-ODE solution and inject it into the mixed solution for 10 minutes, then react Stop heating the mixture until the temperature of the mixture drops to 100°C and maintain this temperature, extract 1ml of trioctylphosphine (TOP) and add dropwise at a rate of 1ml / h for 1h, after the addition, lower the temperature of the reaction mixture to room temperature. Finally, a precipitant was added to the mixt...

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Abstract

The invention provides a cadmium-free core-shell quantum dot and a preparation method thereof; the cadmium-free core-shell quantum dot comprises a quantum dot core, a gradual transition layer continuously grown on the surface of the quantum dot core, and a shell layer formed on the surface of the gradual transition layer, wherein the gradual transition layer comprises core cations and core anions in the quantum dot core, and shell cations and shell anions in the shell layer; in the cadmium-free core-shell quantum dot, the concentrations of the core cations and core anions decrease gradually from inside to outside, and the concentrations of the shell cations and shell anions gradually increase from inside to outside.

Description

technical field [0001] The invention belongs to the technical field of quantum dot synthesis, and in particular relates to a cadmium-free core-shell quantum dot and a preparation method thereof. Background technique [0002] Due to the advantages of high fluorescence efficiency, narrow half-width, and good stability, quantum dots have attracted people's attention. However, traditional quantum dots with high quantum yields are mostly prepared based on cadmium, which is a heavy metal element with high toxicity. Therefore, the application of cadmium-containing quantum dots in some fields is limited, such as biomarkers, electronic products etc. [0003] At present, the research on quantum dots in cadmium-free systems mainly focuses on copper indium sulfur (CuInS), copper indium selenium sulfur (CuInSeS), indium phosphide (InP), silver sulfide (Ag 2 S), zinc selenide (ZnSe) and other systems. However, the quantum dots developed based on the heavy metal-free system have a wide ...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/88C09K11/62C09K11/70C09K11/58B82Y20/00B82Y30/00B82Y40/00
CPCC09K11/02B82Y20/00B82Y30/00B82Y40/00C09K11/584C09K11/623C09K11/703C09K11/883
Inventor 程陆玲杨一行
Owner TCL CORPORATION
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