Perovskite CsPbI3-based quantum dot and preparation method thereof

A quantum dot and perovskite technology, applied in the field of luminescent materials, can solve the problems of decreased luminous efficiency, difficult to completely coat the surface of perovskite quantum dots, difficult to carboxylic acid, etc., so as to improve quantum yield and reduce luminescence. Defects, the effect of improving luminous efficiency

Pending Publication Date: 2021-12-21
BEIFANG UNIV OF NATITIES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, under acidic conditions, carboxylic acids are difficult to ionize, therefore, the surface of PQDs is almost uncharged, and PQDs are still prone to coagulation.
In addition, although small-molecule thiocarboxylic acid stabilizers can be dispersed on the surface of quantum dots to a certain extent, it is difficult to completely cover the surface of perovskite quantum dots, and the resulting surface defects will lead to a decrease in luminous efficiency.

Method used

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  • Perovskite CsPbI3-based quantum dot and preparation method thereof
  • Perovskite CsPbI3-based quantum dot and preparation method thereof
  • Perovskite CsPbI3-based quantum dot and preparation method thereof

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Embodiment 1

[0027] see figure 1 and image 3 As shown, this embodiment relates to a perovskite-based CsPbI 3 Quantum dot and preparation method thereof, its preparation comprises the following steps:

[0028] Step 1, according to the molecular formula perovskite CsPbI 3 The molar ratio of each element in the quantum dots is 1:1. Dissolve PbX2 powder and CsX powder in 15mL dimethyl sulfoxide to obtain mixed solution I. To mixed solution I, add 1.5mL oleic acid and 2mL oleylamine, and ultrasonically After about 10 minutes, the precursor solution was obtained after the mixed solution I was clarified, and then the precursor solution was added to toluene at a ratio of 1:45 to obtain a toluene solution of all-inorganic perovskite quantum dots.

[0029] Step 2, mix the toluene solution of the all-inorganic perovskite quantum dots or the toluene solution of the all-inorganic perovskite quantum dots CsPb(BrnA1-n)3 with the amphiphilic phospholipid chloroform solution and the oil-soluble nanopar...

Embodiment 2

[0032] see figure 2 As shown, this embodiment relates to a perovskite-based CsPbI 3 Quantum dot and preparation method thereof, its preparation comprises the following steps:

[0033]Step 1: Dissolve lead bromide powder and cesium bromide powder in 10 mL of dimethyl sulfoxide at a molar ratio of 1:1, 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 an all-inorganic CsPbI 3 Perovskite quantum dots;

[0034] Step 2: Take 200 mg of dipalmitoylphosphatidylcholine powder and dissolve it in 20 mL of chloroform to obtain a 10 mg / mL dipalmitoylphosphatidylcholine chloroform solution.

[0035] Step 3, in a 100mL single-necked flask, the all-inorganic CsPbI 3 The toluene solution of perovskite quantum dots and dipalmitoylphosphatidylcholine c...

Embodiment 3

[0039] A perovskite-based CsPbI 3 Quantum dot and preparation method thereof, its preparation comprises the following steps:

[0040] Step 1, take lead bromide powder and cesium bromide powder at a molar ratio of 1:1.5 and dissolve them in 20 mL of dimethyl sulfoxide, wherein the concentration of lead bromide is 0.8 mM; then add 2 mL of oleic acid and 1 mL of oleylamine to stabilize, Sonicate until the solution is clear to obtain a precursor solution; slowly add 0.1mL of the above precursor to 20mL of toluene under vigorous stirring at 30°C to obtain an all-inorganic CsPbI 3 Perovskite quantum dots;

[0041] Step 2: Take 150 mg of dipalmitoylphosphatidylcholine powder and dissolve it in 20 mL of chloroform to obtain a 10 mg / mL dipalmitoylphosphatidylcholine chloroform solution.

[0042] Step 3, in a 100mL single-necked flask, the all-inorganic CsPbI 3 The toluene solution of perovskite quantum dots and the dipalmitoylphosphatidylcholine chloroform solution were fully mixed ...

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Abstract

TThe invention relates to a perovskite CsPbI3-based quantum dot and a preparation method thereof.The perovskite CsPbI3-based quantum dot comprises an inner core and a surface shell layer, the inner core is a quantum dot inner core, the surface shell layer is an amphiphilic phospholipid surface shell layer, and the perovskite CsPbI3-based quantum dot is of a micelle-shaped structure. Compared with the prior art, the quantum dots of the perovskite CsPbI3 are provided, The coagulation is not generated under the acidic condition, the quantum yield of the perovskite quantum dot is improved, and a compact coating layer is formed on the surface of the perovskite quantum dot, so that the light-emitting defect is reduced, and the light-emitting efficiency and the stability of the quantum dot are further improved.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a perovskite-based CsPbI 3 Quantum dots and their preparation methods. Background technique [0002] Perovskite materials have been widely used in solar cells, lasers, LEDs (Light Emitting Diode, Light-emitting diodes), flat-panel displays, etc. Among them, the synthetic size and shape are uniform, the dispersion is small, and the pure phase is the basis of the research. Colloidal all-inorganic halide perovskite nanocrystals or quantum dots show excellent performance. Optical properties, such as high fluorescence quantum yield (PLQY), narrow half-peak width, tunable bandgap, long carrier lifetime, high charge mobility, etc., are regarded as a new generation of high-performance optoelectronics / Electro-optic functional materials. Among them, CsPbI 3 Quantum dots have a bandgap of 1.73eV, and show great application prospects in photovoltaics, photoelectric detect...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/66
CPCC09K11/025C09K11/665
Inventor 张正国刘海柯义虎
Owner BEIFANG UNIV OF NATITIES
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