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Core-shell structure quantum dot and preparation method thereof

A technology of core-shell structure and quantum dots, which is applied in the field of core-shell structure quantum dots and its preparation, can solve problems such as difficulty in direct synthesis of large particle size, high stability, difficulty in large-scale production, and decline in quantum yield, so as to slow down the growth rate. Effects of nuclear velocity, good stability, and thick shell thickness

Active Publication Date: 2017-06-13
深圳天吉新创科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to CuInS 2 The quantum yield is too low and it must be surface passivated to form CuInZn x S y Composite structure quantum dots, and its quantum yield can reach more than 30%
In addition, in the CuInS from 2 to CuInZn x S y Defects will be introduced during the synthesis process, resulting in a decrease in quantum yield. Usually, the particle size of the synthesized quantum dots is less than 5nm, and the synthesis process is relatively complicated, making it difficult to produce on a large scale.
Therefore, using CuInS 2 It is not easy to directly synthesize CuInZn with large particle size and high stability x S y quantum dot

Method used

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  • Core-shell structure quantum dot and preparation method thereof
  • Core-shell structure quantum dot and preparation method thereof
  • Core-shell structure quantum dot and preparation method thereof

Examples

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preparation example Construction

[0037] CuInZn of the first preferred embodiment of the present invention x S 2+x The preparation method of / ZnS (0

[0038] First, a quantum dot nucleus solution is prepared.

[0039] (1) Dissolving copper salt, indium salt and zinc salt in an organic solvent to obtain copper precursor, indium precursor and zinc precursor.

[0040]The copper salt is, for example, but not limited to, copper acetate, copper iodide, copper chloride, copper oleate, copper stearate or combinations thereof. The indium salt is, for example, but not limited to, indium acetate, indium iodide, indium chloride, indium oleate or combinations thereof. The zinc salt is, for example, but not limited to, zinc acetate, zinc oleate, zinc stearate or combinations thereof.

[0041] The organic solvent is, for example, but not limited to liquid paraffin, paraffin, stearyl, oleyl ammonia, oleic acid or combinations thereof.

[0042] In order to reduce the cost of synthesizing quant...

Embodiment 1

[0072] (1) Preparation of quantum dot core CuInZn x S 2+x (x=0.5) solution.

[0073] Mix 0.4mmol copper iodide, 0.4mmol indium acetate and 0.20mmol zinc oleate into a 100mL three-necked flask, then add 10mL liquid paraffin and 1mL oleic acid. Under the protection of nitrogen, exhaust the air at 150 degrees for 10-15 minutes, then add 1 mL of octaalkyl tridentate mercaptan, then rapidly heat to 240 ° C, and react for 10 minutes to obtain CuInZn 0.5 S 2.5 Quantum dot nuclei solution.

[0074] (2) Synthesis and coating of the quantum dot core CuInZn 0.5 S 2.5 quantum dot shell ZnS.

[0075] To the CuInZn 0.5 S 2.5A mixed solution of 5 mL of zinc oleate solution (0.8 mmol / mL, the same below) and 0.5 mL of octaalkyl tridentate mercaptan was added to the quantum dot nucleus solution for the first time. After reacting for 1 hour, a mixed solution of 5 mL of the zinc oleate solution and 0.5 mL of octaalkyl tridentate mercaptan was added for the second time. After reacting fo...

Embodiment 2

[0103] CuInZn of Example 2 x S 2+x / ZnS (x=0.9) preparation method of core-shell structure quantum dots: with reference to the preparation method of embodiment 1, difference is in the synthetic quantum dot core CuInZn 0.9 S 2.9 During the solution process, the molar amount of zinc oleate added was 0.36 mmol, and other parameters were the same. The CuInZn 0.5 S 2.5 The particle size of the / ZnS core-shell quantum dot is about 11.2nm, the thickness of the shell layer is 4.1nm, and the quantum yield is 70%.

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Abstract

The invention provides a preparation method of a core-shell structure quantum dot. The preparation method comprises the following steps: dissolving copper salt, indium salt and zinc salt into an organic solvent to obtain a copper precursor, an indium precursor and a zinc precursor; adding mercaptan into the copper precursor, the indium precursor and the zinc precursor, mixing and reacting for a period of time to obtain a CuInZnxS2+x (x is less than 0 but is more than or equal to 1) quantum dot core solution; adding a shell layer material into the quantum dot core solution, reacting for a period of time, repeatedly adding the shell layer material for multiple times at intervals to obtain the CuInZnxS2+x / ZnS core-shell structure quantum dot, wherein the shell layer material is a mixed solution of the zinc salt solution and the mercaptan. The invention further provides the core-shell structure quantum dot prepared by the method. The preparation method provided by the invention has the benefits that the synthetic process is simple, the quantum yield reaches 60-80 percent, and the obtained quantum dot is strong in stability, and a shell layer is relatively thick.

Description

technical field [0001] The invention relates to a quantum dot with a core-shell structure and a preparation method thereof. Background technique [0002] To prepare semiconductor quantum dots in the visible-near-infrared fluorescence range, the main research focus is on CdTe, CdSe, PbS, PbSe and Cd x Hg1 -x Te and other heavy metal quantum dots containing Cd, Pb, Hg, etc. However, because these quantum dots contain toxic elements such as Cd, Pb, and Hg, and flammable and explosive precursors are usually used in the preparation of quantum dots, their applications in optoelectronic devices and biomarkers are limited. [0003] At present, people focus on the research hotspots of the preparation of luminescent semiconductor quantum dots on I-III-VI 2 Preparation of semiconductor quantum dots, especially CuInS 2 Quantum dots, which can not only continuously adjust the visible-near-infrared luminescence, but also have low toxicity. Since CuInS 2 Quantum dots do not contain t...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/62
CPCC09K11/02C09K11/623
Inventor 白洁恒蔚宏
Owner 深圳天吉新创科技有限公司
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