Perovskite quantum dots based on castor oil as green solvent and preparation method of perovskite quantum dots

A technology of green solvent and castor oil, applied in chemical instruments and methods, luminescent materials, etc., can solve pollution and other problems, and achieve the effect of simple operation, good stability and convenient operation

Active Publication Date: 2020-06-30
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of perovskite quantum dot and its preparation method based on castor oil as green solvent, which overcomes the existing preparation of perovskite quantum dots. The problem of environmental pollution caused by the use of organic solvents in the point process can reduce the pollution of organic solvents to the environment and be more environmentally friendly

Method used

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preparation example Construction

[0015] The invention relates to a perovskite quantum dot based on castor oil as a green solvent and a preparation method thereof. First, cesium bromide and bismuth bromide are dissolved in castor oil, and an octylamine ligand is added to form a precursor solution, and a small amount of The precursor solution was injected into the anti-solvent ethanol and vigorously stirred at 80 °C to form Cs 3 Bi 2 Br 9 Quantum dot solution. After removing impurities by centrifugation at 8000r / min, the clarified Cs 3 Bi 2 Br 9 Quantum dot solution.

[0016] The present invention adopts following raw material to make:

[0017] In terms of dry mass, 0.430-0.438 parts of cesium bromide; 0.608-0.616 parts of bismuth bromide; 0.259-0.271 parts of octylamine; 58.239-58.639 parts of castor oil; 40.15-40.35 parts of absolute ethanol.

[0018] Specifically, it is realized by the following steps:

[0019] In terms of dry mass, take 0.430-0.438 parts of cesium bromide and 0.608-0.616 parts of bi...

Embodiment 1

[0021] In terms of dry mass, take 0.430 parts of cesium bromide and 0.608 parts of bismuth bromide into a 20 mL three-necked flask, then add 0.259 parts of octylamine and 58.239 parts of castor oil, and stir at room temperature for 6 hours to form a precursor solution. Take out 5mL of the precursor solution, slowly drop it into 40.15 parts of absolute ethanol, stir vigorously at 80°C, react for 10min, and cool down to room temperature naturally. Centrifuge at 8000r / min to remove the precipitate to obtain Cs 3 Bi 2 Br 9 Quantum dot solution.

Embodiment 2

[0023] In terms of dry mass, 0.432 parts of cesium bromide and 0.610 parts of bismuth bromide were put into a 20 mL three-necked flask, and then 0.262 parts of octylamine and 58.339 parts of castor oil were added, and stirred at room temperature for 6 hours to form a precursor solution. Take out 5mL of the precursor solution, slowly drop it into 40.20 parts of absolute ethanol, stir vigorously at 80°C, react for 10min, and cool down to room temperature naturally. Centrifuge at 8000r / min to remove the precipitate to obtain Cs 3 Bi 2 Br 9 Quantum dot solution.

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Abstract

The invention relates to perovskite quantum dots based on castor oil as a green solvent and a preparation method of the perovskite quantum dots, wherein the pollution of an organic solvent to the environment can be reduced and the preparation method is greener and more environment-friendly; the passivation effect on the surface defects of the perovskite quantum dots can be achieved, so that the perovskite quantum dots are more stable. According to the technical scheme adopted by the invention, the method comprises the steps: taking 0.430-0.438 part by dry mass of cesium bromide and 0.608-0.616part by dry mass of bismuth bromide, putting the cesium bromide and the bismuth bromide into a 20 mL three-neck bottle, then adding 0.259-0.271 part by dry mass of octylamine and 58.239-58.639 partsby dry mass of castor oil, and stirring at normal temperature for 6 h to form a precursor solution; taking out 5 mL of the precursor solution, slowly dropwise adding the precursor solution into 40.15-40.35 part of absolute ethyl alcohol, violently stirring at the temperature of 80 DEG C, carrying out a reaction for 10 min, and naturally cooling to room temperature; and centrifuging at 8000 r / min,and removing a precipitate to obtain a Cs3Bi2Br9 quantum dot solution.

Description

Technical field: [0001] The invention relates to a perovskite quantum dot and a preparation method thereof, in particular to a perovskite quantum dot based on castor oil as a green solvent and a preparation method thereof. Background technique: [0002] Perovskite quantum dots have attracted extensive attention due to their high quantum efficiency, easily tunable luminescence, and narrow emission lines. Due to its unique quantum confinement effect, researchers can tune its bandgap by adjusting its size. Due to these excellent photoelectric properties, quantum dots have a wide range of applications in solar cells, lasers, light-emitting diodes, and biological imaging. Although perovskite quantum dots have superior performance in many aspects, there are still many problems in order to realize their commercialization. First of all, the stability is poor. Quantum dots are degraded to varying degrees in light, heat, and air, resulting in severe fluorescence quenching, which lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/74C09K11/02
CPCC09K11/7435C09K11/02Y02E10/549
Inventor 吕斌暴欣郭旭高党鸽
Owner SHAANXI UNIV OF SCI & TECH
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