Method for preparing perovskite quantum dot at room temperature

A perovskite and quantum dot technology, applied in chemical instruments and methods, lead compounds, inorganic chemistry, etc., can solve problems such as anion exchange, change in emission wavelength, and limit applications in the display field, and achieve mild reaction conditions and short reaction time. , the effect of high photoelectric conversion efficiency

Inactive Publication Date: 2018-06-29
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, perovskite quantum dots with different halogen ratios are prone to anion exchange after mixing, which changes their respective compositions and emission wavelengths, which limits their application in the display field.

Method used

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  • Method for preparing perovskite quantum dot at room temperature
  • Method for preparing perovskite quantum dot at room temperature
  • Method for preparing perovskite quantum dot at room temperature

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0023] Synthesis method of organic perovskite quantum dots at room temperature (20-30°C): the metal halide salt PbBr 2 It is weighed 1:1 with MABr by molar ratio, and then put into a 15mL strain bottle. Then add 4-7ml DMF and 0.1mmol DMSO. Turn on the magnetic stirring at a stirring speed of 800-1200r / min, and fully stir for 30-50min to completely dissolve the solute and form a precursor solution. Then quickly add the surfactant BA solution to the precursor solution, and the molar ratio of the surfactant to MABr is 1:1, and react for 18-24 hours to make the solution evenly mixed. It does not require high temperature heating or inert gas protection, just At room temperature.

[0024] Quickly inject the prepared mixed solution into the chlorobenzene solution with a volume ratio of 1:30 (quick stirring). The resulting target solution.

[0025] Centrifuge the above-mentioned reaction product and centrifuge at 800-1200rpm for 2-5min to remove the precipitate. Take out the supernatant...

Embodiment 2

[0028] Synthesis method of organic perovskite quantum dots at room temperature (20-30°C): the metal halide salt PbBr 2 It is weighed 1:1 with MABr by molar ratio, and then put into a 15mL strain bottle. Then add 4-7ml DMF and 0.1mmol DMSO. Turn on the magnetic stirring at a stirring speed of 800-1200r / min, and fully stir for 30-50min to completely dissolve the solute and form a precursor solution. Then quickly add the surfactant BA solution to the precursor solution, and the molar ratio of the surfactant to MABr is 3:1, and react for 18-24 hours to make the solution evenly mixed. There is no need for high temperature heating, no inert gas protection, just At room temperature.

[0029] Quickly inject the prepared mixed solution into the chlorobenzene solution with a volume ratio of 1:30 (quick stirring). The resulting target solution.

[0030] Centrifuge the above-mentioned reaction product and centrifuge at 800-1200rpm for 2-5min to remove the precipitate. Take out the supernata...

Embodiment 3

[0032] Synthesis method of organic perovskite quantum dots at room temperature (20-30℃): the metal halide salt PbI 2 It is weighed 1:1 with MAI massager ratio and put into a 15mL strain bottle. Then add 4-7ml DMF and 0.1mmol DMSO. Turn on the magnetic stirring at a stirring speed of 800-1200r / min, and fully stir for 30-50min to completely dissolve the solute and form a precursor solution. Then quickly add the surfactant BA solution to the precursor solution, and the molar ratio of surfactant to MAI is 1:1, react for 18-24 hours to make the solution evenly mixed without high temperature heating or inert gas protection, just At room temperature.

[0033] Quickly inject the prepared mixed solution into the chlorobenzene solution with a volume ratio of 1:30 (quick stirring). The resulting target solution.

[0034] Centrifuge the above-mentioned reaction product and centrifuge at 800-1200rpm for 2-5min to remove the precipitate. Take out the supernatant and centrifuge at 11000-15000r...

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Abstract

The invention discloses a method for preparing a perovskite quantum dot at a room temperature. The luminescent quantum dot is MPbX3; in the formula, M is methyl amine (MA) or Cs, and X is any one of Cl, Br and I. According to the method disclosed by the invention, MX and PbX2 are dissolved in an organic solvent, and a certain amount of surfactant is added to form a precursor solution; an appropriate amount of the precursor solution is added into a poor solvent to form the perovskite quantum dot. By changing the quantity of the surfactant, the luminescence wavelength of the quantum dot can be adjusted, so that luminescence of fully-visible wave bands is realized. The method disclosed by the invention can be carried out at the normal temperature, protective gas is not needed, equipment is simple, and scale production is realized. According to the perovskite quantum dot prepared by the method, the fluorescent full width at half maximum is 20 to 43nm; the fluorescent quantum efficiency isnearly 90 percent, and the perovskite quantum dot can be applied to the fields of solar batteries, laser, photo-detectors, light-emitting diodes and the like.

Description

Technical field [0001] The invention relates to a method for preparing perovskite quantum dots at room temperature, and belongs to the technical field of preparation of novel nanometer optoelectronic materials. Background technique [0002] Quantum dots refer to semiconductor cluster materials with a size less than 100nm. Since the movement of internal electrons in all directions is restricted, they exhibit quantum confinement, Coulomb blockade, dielectric confinement, quantum tunneling and other effects. Quantum dots have the advantages of solution preparation, adjustable energy band width, high quantum yield, etc., and have broad application prospects in the field of photoelectric devices such as light-emitting diodes, flat panel displays, solar cells, and fluorescent labels. [0003] Thanks to the extremely high luminous color purity and luminous efficiency, quantum dots have entered commercial applications in the display field. Compared with the classic cadmium-based quantum d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66C09K11/06B82Y40/00B82Y20/00C01G21/16
CPCB82Y20/00B82Y40/00C01G21/006C09K11/06C09K11/665
Inventor 徐凌波崔灿强亚萍
Owner ZHEJIANG SCI-TECH UNIV
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