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Efficient perovskite quantum dot anion exchange method

A perovskite and quantum dot technology, applied in sustainable manufacturing/processing, electrical components, climate sustainability, etc., can solve the problems of low stability and poor efficiency of perovskite nanocrystals, and achieve good environmental stability , good monodispersity, good monochromatic effect

Inactive Publication Date: 2019-06-21
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Room temperature photoluminescence quantum yields (PLQYs) are close to unity in the green and red spectral ranges, but thermal injection or conventional anion exchange yields CsPbCl 3 The low stability and poor efficiency (<10%) of perovskite nanocrystals greatly limit their applications

Method used

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  • Efficient perovskite quantum dot anion exchange method
  • Efficient perovskite quantum dot anion exchange method
  • Efficient perovskite quantum dot anion exchange method

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Embodiment 1

[0021] The CsPbCl of this embodiment 3 The preparation method of perovskite quantum dot anion exchange material comprises the following steps:

[0022] (1) Weigh 0.407g of cesium carbonate and add it to 20mL of octadecene (ODE) and 1.25ml of oleic acid (OA) in a 100ml three-necked flask; turn on the heating platform, vacuumize at 120°C for 1h, and then pass N 2 , heated to 150°C under its atmosphere until all solid powders were completely reacted and dissolved, and the liquid was transparent. Octadecene (ODE) 5mL, oleic acid (OA) 2mL, oleylamine (OAm) 2mL, lead bromide (PbBr 2 )0.0690g (0.188mmol) was mixed in a 25ml three-necked flask, heated to 120°C and vacuumed for 1h, N 2 Stir at 120°C under the atmosphere (stirring speed is 300r / min) until the solid is completely dissolved to obtain a bromide solution. After the temperature is stable, heat up to 160°C again and inject 0.4ml of Cs-oil precursor. After reacting for 5s, proceed quickly Cool in an ice water bath. After t...

Embodiment 2

[0026] This embodiment CsPbCl 3 The preparation method of the perovskite quantum dot anion exchange material comprises the steps:

[0027] (1) Weigh 0.407g of cesium carbonate and add it to 20mL of octadecene (ODE), 1.25ml of oleic acid (OA) OA mixed solution in a 100ml three-necked flask; turn on the heating platform, vacuumize at 120°C for 1h, and then pass N 2 , heated to 150°C under its atmosphere until all solid powders were completely reacted and dissolved, and the liquid was transparent. Octadecene (ODE) 5mL, oleic acid (OA) 2mL, oleylamine (OAm) 2mL, lead bromide (PbBr 2 )0.0690g (0.188mmol) was mixed in a 25ml three-necked flask, heated to 120°C and vacuumed for 30min, N 2 Stir at 120°C under the atmosphere (stirring speed is 300r / min) until the solid is completely dissolved to obtain a bromide solution. After the temperature is stable, heat up to 160°C again and inject 0.4ml of Cs-oil precursor. After reacting for 5s, proceed quickly Cool in an ice water bath. Af...

Embodiment 3

[0031] This embodiment CsPbCl 3 The preparation method of the perovskite quantum dot anion exchange material comprises the steps:

[0032] (1) Weigh 0.407g of cesium carbonate and add it to 20mL of octadecene (ODE) and 1.25ml of oleic acid (OA) in a 100ml three-necked flask; turn on the heating platform, vacuumize at 120°C for 1h, and then pass N 2 , heated to 150°C under its atmosphere until all solid powders were completely reacted and dissolved, and the liquid was transparent. Octadecene (ODE) 5mL, oleic acid (OA) 2mL, oleylamine (OAm) 2mL, lead bromide (PbBr 2 )0.0690g (0.188mmol) was mixed in a 25ml three-necked flask, heated to 120°C and vacuumed for 30min, N 2 Stir at 120°C under the atmosphere (stirring speed is 300r / min) until the solid is completely dissolved to obtain a bromide solution. After the temperature is stable, heat up to 160°C again and inject 0.4ml of Cs-oil precursor. After reacting for 5s, proceed quickly Cool in an ice water bath. After the reactio...

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Abstract

The invention discloses an efficient perovskite quantum dot anion exchange method. The method comprises the steps that (1) a CsPbBr<3> perovskite quantum dot stock solution is prepared; (2) the CsPbBr<3> perovskite quantum dot stock solution is purified to obtain a fluorescent transparent solution; and (3) halide and deionized water are mixed to prepare a halide aqueous solution, a surfactant is added dropwise to the upper layer of the halide aqueous solution to form an interface layer, then the fluorescent transparent solution obtained after purification in the step (2) is added to form layers, the solution stands under room temperature for a reaction, the upper-layer liquid is taken, and a perovskite quantum solution after anion exchange is obtained.

Description

technical field [0001] The invention relates to a preparation method of a perovskite quantum dot material, in particular to an efficient method for anion exchange of a perovskite quantum dot. Background technique [0002] Inorganic cesium lead halide (CsPbX 3 , X = Cl, Br, I) Perovskite nanocrystals (NCs) have attracted interest and attention due to their outstanding optical and electronic properties, such as bright photoluminescence (PL) in the broad visible spectral region Tunable internal emission (400-700nm), 1-3 narrow emission width at half maximum (fwhm), high stability, etc., make them promising in high-performance lighting and display applications. Room temperature photoluminescence quantum yields (PLQYs) are close to unity in the green and red spectral ranges, but thermal injection or conventional anion exchange yields CsPbCl 3 The low stability and poor efficiency (<10%) of perovskite nanocrystals greatly limit their applications. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): H01L31/0352H01L31/18H01L33/04
CPCY02P70/50
Inventor 吕文珍陈润锋徐鸣川
Owner NANJING UNIV OF POSTS & TELECOMM
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