Preparation method of blue light emitting perovskite quantum dots based on surface modifier

A technology of surface modification and quantum dots, which is applied in the field of nanomaterials, can solve the problems of complex luminescence peak position adjustment methods of all-inorganic perovskite quantum dots, unfavorable multi-color quantum dot synthesis, etc., to save time and economic costs, The effect of low cost and novel preparation method

Active Publication Date: 2019-01-25
SOUTHEAST UNIV
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Problems solved by technology

However, the adjustment method of the luminescence peak position of all-inorganic perovskite quantum dots is very complicated. Usually, the purpose of adjusting the emission peak position is achieved by adjusting the particle size of the quantum dots by adjusting the type and ratio of halogen elements or adjusting the synthesis temperature of quantum dots. This is obviously not conducive to the synthesis of multicolor quantum dots

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  • Preparation method of blue light emitting perovskite quantum dots based on surface modifier

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Embodiment 1

[0029] A method for preparing a blue-light emitting perovskite quantum dot based on a surface modifier, the method comprising the following steps:

[0030] 1) The all-inorganic perovskite quantum dots CsPbBr 3 and functional polyethylene glycol, namely diaminopolyethylene glycol, were completely dissolved in deionized water to obtain all-inorganic perovskite quantum dots CsPbBr with a concentration of 1 mg / mL. 3 Deionized aqueous solution and 1 mg / mL diaminopolyethylene glycol deionized aqueous solution;

[0031] 2) At room temperature, the all-inorganic perovskite quantum dots CsPbBr 3 The deionized water solution and the diaminopolyethylene glycol deionized water solution are fully mixed at a mass ratio of 1:1, stirred and reacted for 1 hour, and a mixed solution is obtained;

[0032] 3) Put the mixed solution in a centrifuge, and centrifuge for 5 minutes at a speed of 8000 rpm. After collecting the supernatant, disperse the precipitate into a deionized aqueous solution to...

Embodiment 2

[0035] A method for preparing a blue-light emitting perovskite quantum dot based on a surface modifier, the method comprising the following steps:

[0036] 1) The all-inorganic perovskite quantum dots CsPbBr 3 and functional polyethylene glycol, that is, methoxypolyethylene glycol amine, were completely dissolved in deionized water to obtain all-inorganic perovskite quantum dots CsPbBr with a concentration of 1 mg / mL. 3 Deionized aqueous solution and 10 mg / mL methoxypolyethylene glycol amine deionized aqueous solution;

[0037] 2) At room temperature, the all-inorganic perovskite quantum dots CsPbBr 3 The deionized aqueous solution and the methoxypolyethylene glycol amine deionized aqueous solution are fully mixed at a mass ratio of 1:1, stirred and reacted for 3 hours, and a mixed solution is obtained;

[0038] 3) Put the mixed solution in a centrifuge, and centrifuge for 10 minutes at a speed of 15,000 rpm. After collecting the supernatant, disperse the precipitate into a ...

Embodiment 3

[0041] A method for preparing a blue-light emitting perovskite quantum dot based on a surface modifier, the method comprising the following steps:

[0042] 1) The all-inorganic perovskite quantum dots CsPbBr 3 and functional polyethylene glycol, that is, dicarboxypolyethylene glycol, were completely dissolved in deionized water to obtain all-inorganic perovskite quantum dots CsPbBr with a concentration of 10 mg / mL. 3 Deionized aqueous solution and 1 mg / mL dicarboxypolyethylene glycol deionized aqueous solution;

[0043] 2) At room temperature, the all-inorganic perovskite quantum dots CsPbBr3 The deionized aqueous solution and the dicarboxypolyethylene glycol deionized aqueous solution are fully mixed at a mass ratio of 1:1, stirred and reacted for 2 hours, and a mixed solution is obtained;

[0044] 3) Place the mixed solution in a centrifuge, and centrifuge for 8 minutes at a speed of 12,000 rpm. After collecting the supernatant, disperse the precipitate into a deionized aqu...

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Abstract

The invention discloses a preparation method of blue light emitting perovskite quantum dots based on a surface modifier. The preparation method comprises the following steps that 1, all-inorganic perovskite quantum dots CsPbBr3 and functional polyethylene glycol are dissolved in deionized water to obtain an all-inorganic perovskite quantum dot CsPbBr3 water solution and a functional polyethylene glycol water solution; 2, the all-inorganic perovskite quantum dot CsPbBr3 water solution and the functional polyethylene glycol water solution are fully stirred and mixed to obtain a mixed solution; 3, the mixed solution in the step 2 is centrifuged, and the obtained precipitate is the blue light emitting perovskite quantum dots based on the surface modifier. The method utilizes the functional polyethylene glycol material to coat the all-inorganic perovskite quantum dots, the purpose of changing emitting wavelength is achieved, the biocompatibility of the all-inorganic perovskite quantum dotsis also improved, and meanwhile a lot of time and economic costs can be saved.

Description

technical field [0001] The invention relates to a method for preparing a blue light-emitting perovskite quantum dot based on a surface modifier, and belongs to the field of nanomaterials. Background technique [0002] Quantum dots (quantum dots, QDs), also known as semiconductor nanocrystals (semiconductor nanocrystal), refer to semiconductor materials that reach a certain critical size (exciton Bohr radius) in three-dimensional space and have quantum confinement effects. As a semiconductor material, all-inorganic perovskite quantum dots have the characteristics of simple synthesis, narrow emission peak (12-42nm half maximum width), and high fluorescence quantum efficiency (up to 90%). The fields of batteries, photodetectors, lasers and biological imaging have bright application prospects. However, the adjustment method of the luminescence peak position of all-inorganic perovskite quantum dots is very complicated. Usually, the purpose of adjusting the emission peak position...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/66B82Y20/00B82Y30/00B82Y40/00
CPCB82Y20/00B82Y30/00B82Y40/00C09K11/025C09K11/665
Inventor 王著元杨朝雁张若虎宗慎飞崔一平徐淑宏王春雷
Owner SOUTHEAST UNIV
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