Preparation method of quaternary quantum dot CdSe@ZnS

A quantum dot, cd-zn technology, applied in the field of preparation of quaternary quantum dots CdSeZnS, can solve the problems of difficulty in ensuring the quality of final quantum dots, repeatability, high price, complicated steps, etc., and achieves increased yield, enhanced stability, good repeatability

Inactive Publication Date: 2016-02-03
CHINA BEIJING BEIDA JUBANG SCI & TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, there are still deficiencies. For example, the steps are relatively cumbersome. If the first step of synthesis is not repeatable, it will directly affect the subsequent reaction, and the quality of the final quantum dots generated is difficult to guarantee repeatability. On the other hand, the organic The solvents are all expensive trioctylamine and octadecyl phosphoric acid, etc.

Method used

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  • Preparation method of quaternary quantum dot CdSe@ZnS
  • Preparation method of quaternary quantum dot CdSe@ZnS
  • Preparation method of quaternary quantum dot CdSe@ZnS

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[0030] The embodiment of the present invention provides a kind of preparation method of quaternary quantum dot CdSeZnS, comprising

[0031] Step 1. Dissolving the Cd source and Zn source in the mixed solution of long-chain fatty acids and long-chain alkenes, and then heating the mixed liquid to 140-300°C in a container filled with inert gas to obtain Cd-Zn front body stock solution; wherein the Cd source is cadmium acetate or an inorganic salt of cadmium; the Zn source is zinc acetate or zinc stearate or zinc oxide;

[0032] Step 2, dissolving Se source and S source in trihydrocarbyl phosphine to obtain Se and S precursor stock solution; in a container filled with inert gas, inject Se and S precursor stock solution into Cd-Zn precursor stock solution Fully mixed and stirred to fully react to obtain a CdSeZnS solution, so that the molar ratio of the Cd precursor, the Zn precursor and the Se precursor is 1:25:25-10;

[0033] Step 3, fully mix the mixed solution of Zn so...

Embodiment 1

[0049] (a) Weigh 0.8mmol cadmium acetate and 20.0mmol zinc stearate into four-neck bottle A, add 42ml oleic acid and 90ml octadecene (ODE), heat to 140°C to completely dissolve cadmium acetate and zinc acetate , to obtain the Zn-Cd precursor stock solution.

[0050] (b) Weigh 16mmol of zinc acetate into three-necked bottle B, add 12mL of oleic acid (OA) and 18ml of octadecene (ODE), and completely dissolve the zinc acetate under the protection of nitrogen to obtain a Zn precursor stock solution; Prepare the S source solution, that is, dodecyl mercaptan (DDT) 8mmol, tributylphosphine (TBP) 45mmol, ODE, 15ml. Mix well to obtain the precursor solution of the S source.

[0051] (c) Weigh 20mmol of Se powder and 20mmol of S into conical flask C, and add 46mmol of TBP so that the molar ratio of Se, S and TBP is 1:2.3, ultrasonically oscillate to completely dissolve Se and S, and obtain Se and S precursors. body stock solution. Under the protection of nitrogen, the temperatur...

Embodiment 2

[0056] (a) Weigh 0.8mmol cadmium acetate and 20.0mmol zinc stearate into four-neck bottle A, add 42ml oleic acid and 90ml octadecene (ODE), heat to 140°C to completely dissolve cadmium acetate and zinc acetate , to obtain the Zn-Cd precursor stock solution.

[0057] (b) Weigh 16mmol of zinc acetate into three-neck bottle B, add 12mLOA and 18ml of ODE, and completely dissolve zinc acetate under nitrogen protection to obtain Zn precursor stock solution; configure S source solution, namely DDT8mmol, TBP45mmol, ODE , 15ml. Mix well to get the precursor solution of S source.

[0058] (c) Weigh 16mmol of Se powder and 16mmol of S into Erlenmeyer flask C, add 36.8mmol of TBP, make the molar ratio of Se, S and TBP 1:1:2.3, and ultrasonically oscillate to completely dissolve Se and S to obtain Se , S precursor stock solution. Under the protection of nitrogen, the temperature of the Cd-Zn precursor stock solution was raised to 300°C, and the Se and S precursor stock solutions we...

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Abstract

The invention provides a preparation method of a quaternary quantum dot CdSe@ZnS / Zns. The preparation method comprises the following steps: preparation a Cd-Zn precursor stock solution, preparing a Se precursor stock solution and a S precursor stock solution; injecting the Se precursor stock solution and S precursor stock solution into the Cd-Zn precursor stock solution in a container filled with inert gas, fully mixing and stirring to carry out reactions completely to obtain a CdSe@ZnS solution; fully mixing a Zn source with a mixed solution of long-chain aliphatic acid and long-chain alkane / alkene in a container filled with inert gas to obtain a Zn precursor stock solution; fully mixing a S source solution formed by long-chain mercaptan, trialkyl phosphine, and long-chain alkane / alkene to obtain an S source precursor solution; dissolving the Zn precursor stock solution into the CdSe@ZnS solution obtained in the step (2), and dropwise adding the S source precursor solution to carry out reactions for 30 to 120 minutes to cover the shell layer so as to obtain the CdSe@ZnS / Zns quantum dot.

Description

technical field [0001] The invention relates to the field of high-performance materials, in particular to a method for preparing quaternary quantum dots CdSeZnS. Background technique [0002] Quantum dots (quantumdots) are quasi-zero-dimensional semiconductor nanomaterials, and the three dimensions are all on the order of nanometers. Its composition is composed of II-VI group (such as CdS, CdSe, CdTe, ZnSe, etc.) or III-V group elements (such as InP, InAs, etc.), and it is composed of a limited number of atoms, stable nanoparticles with a diameter of 1-20nm . As a novel semiconductor nanomaterial, quantum dots have many unique nanometer properties. For example, the emission spectrum of quantum dots can be controlled by changing the size of quantum dots; quantum dots have good photostability; quantum dots have excitation The spectrum is wide and continuously distributed, while the emission spectrum is narrow and symmetrical, the color is adjustable, the photochemical stabil...

Claims

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Application Information

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IPC IPC(8): C09K11/88B82Y20/00B82Y30/00B82Y40/00
Inventor 魏新盼刘爱军赵治强高晓斌
Owner CHINA BEIJING BEIDA JUBANG SCI & TECH CO LTD
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