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A kind of water-soluble all-inorganic perovskite quantum dots and preparation method thereof

A technology of inorganic calcium and quantum dots, which is applied in the fields of nanomaterials and fluorescence analysis, can solve the problems of poor water stability and achieve the effects of multiple optional structures, simple operation, and reduced release

Active Publication Date: 2020-01-03
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] As a semiconductor material, all-inorganic perovskite quantum dots have the advantages of simple synthesis, narrow emission peak (12-42nm half-maximum width), high fluorescence quantum efficiency (up to 90%), and adjustable luminescence peak position (controlling The types and proportions of halogen elements, and the adjustment of the synthesis temperature of quantum dots to adjust the particle size of quantum dots) and other characteristics, it has a huge advantage in biological imaging, but the poor water stability limits its application in biology, therefore, it is urgent Need a kind of preparation method of water-soluble all-inorganic perovskite quantum dots to solve the above problems

Method used

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  • A kind of water-soluble all-inorganic perovskite quantum dots and preparation method thereof
  • A kind of water-soluble all-inorganic perovskite quantum dots and preparation method thereof

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Embodiment 1

[0029] A water-soluble all-inorganic perovskite quantum dot, the water-soluble all-inorganic perovskite quantum dot is a micelle structure, and its inner layer is an all-inorganic perovskite quantum dot CsPbBr 3 , the outer layer is the amphiphilic phospholipid dipalmitoylphosphatidylcholine, and the inner and outer layers are connected by hydrophilic and hydrophobic interactions, in which the all-inorganic perovskite quantum dots CsPbBr 3 , The weight ratio of dipalmitoylphosphatidylcholine is 1:54, and its preparation comprises the following steps:

[0030] Step 1: Take lead bromide powder and cesium bromide powder at a molar ratio of 1:1 and dissolve them in 10 mL of dimethyl sulfoxide, where the concentration of lead bromide is 0.4 mM; then add 1 mL of oleic acid and 0.5 mL of oleylamine to stabilize , sonicate until the solution is clear to obtain a precursor solution; slowly add 0.1 mL of the above precursor to 10 mL of toluene under vigorous stirring at 30 ° C to obtain...

Embodiment 2

[0035] A water-soluble all-inorganic perovskite quantum dot, the water-soluble all-inorganic perovskite quantum dot is a micelle structure, and its inner layer is an all-inorganic perovskite quantum dot CsPbBr 1.5 Cl 1.5 , the outer layer is the amphiphilic phospholipid dipalmitoylphosphatidylcholine, and the inner and outer layers are connected by hydrophilic and hydrophobic interactions, in which the all-inorganic perovskite quantum dots CsPbBr 1.5 Cl 1.5 , The weight ratio of dipalmitoylphosphatidylcholine is 1.35:54, and its preparation comprises the following steps:

[0036] Step 1: Dissolve lead bromide powder, lead chloride powder and cesium bromide powder in 10 mL of dimethyl sulfoxide according to the molar ratio of 0.5:0.5:1, where the concentration of lead chloride is 0.2 mM; then add 2 mL of oil The acid and 0.5mL oleylamine are stable, and the solution is sonicated until the solution is clear to obtain a precursor solution; 1mL of the above precursor is slowly add...

Embodiment 3

[0041] A water-soluble all-inorganic perovskite quantum dot, the water-soluble all-inorganic perovskite quantum dot is a micelle structure, and its inner layer is an all-inorganic perovskite quantum dot CsPbBr 1.5 I 1.5 , the outer layer is the amphiphilic phospholipid dipalmitoylphosphatidylcholine, and the inner and outer layers are connected by hydrophilic and hydrophobic interactions, in which the all-inorganic perovskite quantum dots CsPbBr 1.5 I 1.5 , The weight ratio of dipalmitoylphosphatidylcholine is 1.2:54, and its preparation comprises the following steps:

[0042] Step 1: Dissolve lead bromide powder, lead iodide powder and cesium bromide powder in 10 mL of dimethyl sulfoxide according to the molar ratio of 0.5:0.5:1, where the concentration of lead iodide is 0.5 mM; add 2 mL of oil The acid and 0.5mL oleylamine are stable, and the solution is sonicated until the solution is clear to obtain a precursor solution; 1mL of the above precursor is slowly added to 10mL...

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Abstract

The invention discloses a water-soluble full-inorganic perovskite quantum dot and a preparation method thereof. The water-soluble full-inorganic perovskite quantum dot is of a micellar structure, wherein an inner layer of the micellar structure is the full-inorganic perovskite quantum dot and an outer layer of the micellar structure is amphiphilic phospholipid; and the inner layer and the outer layer are connected by interaction of a hydrophilic action and a hydrophobic action. The preparation method of the water-soluble full-inorganic perovskite quantum dot comprises the following steps: firstly, preparing a full-inorganic perovskite quantum dot toluene solution; and secondly, uniformly mixing the full-inorganic perovskite quantum dot toluene solution with an amphiphilic phospholipid chloroformic solution, removing an organic solvent and then dissolving into ultrapure water to obtain the water-soluble full-inorganic perovskite quantum dot. According to the preparation method of the water-soluble full-inorganic perovskite quantum dot, disclosed by the invention, by utilizing biocompatible phospholipids, the oil-soluble full-inorganic perovskite quantum dots are dispersed into water, fluorescence emission of the full-inorganic perovskite quantum dots in water for over 10 days is achieved and the biological imaging limitation due to the reason that perovskite quantum dots are easily hydrolyzed in the water is overcome.

Description

technical field [0001] The invention relates to a water-soluble all-inorganic perovskite quantum dot and a preparation method thereof, belonging to the fields of nanomaterials and fluorescence analysis. 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 new type of inorganic fluorescent probe, quantum dots have many unique properties, which can effectively overcome some fatal weaknesses of organic fluorescent dyes and fluorescent proteins, mainly as follows: (1) wide and continuous distribution of excitation spectrum; (2) The emission spectrum is narrow, usually the full width at half maximum is 25-35nm, and the distribution is symmetrical; (3) the emission spectrum is adjustable within the range of 400nm-1350nm; (4) the fluorescence qu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/66B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/025C09K11/665
Inventor 王著元杨朝雁宗慎飞崔一平王春雷徐淑宏
Owner SOUTHEAST UNIV