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Aluminum distearate coating method for improving stability of perovskite quantum dots

A technology of aluminum distearate and quantum dots, which is applied in the field of optoelectronic material preparation, can solve the problems of unfavorable applications, poor thermal stability of size polymers, etc., achieve passivation of surface defects, excellent optical and colloidal stability, and reduce erosion Effect

Active Publication Date: 2019-11-29
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polymer-coated perovskite quantum dots usually have a large size (0.4-5 micron range) and the polymer with a carbon chain structure has poor thermal stability, which is not conducive to its application in photovoltaic and optoelectronic devices.

Method used

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  • Aluminum distearate coating method for improving stability of perovskite quantum dots
  • Aluminum distearate coating method for improving stability of perovskite quantum dots
  • Aluminum distearate coating method for improving stability of perovskite quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] (a) 0.1628g Cs 2 CO 3 , 0.5mL oleic acid and 8mL 1-octadecene were added to a 50mL three-necked flask, the reaction system was heated to 120°C under vacuum and kept for 1 hour, then nitrogen was introduced into the reaction system and heated to 150°C until Cs 2 CO 3 Completely dissolved to obtain a clear and transparent cesium source solution.

[0055] (b) 0.0867g PbI 2 , 5mL 1-octadecene, 0.7mL oleic acid, 0.7mL oleylamine and 55mg aluminum distearate were added to a 50mL three-necked flask, and the reaction system was heated to 120°C under vacuum until the reactants were completely dissolved and kept for 1 hour , then feed nitrogen into the reaction system and heat to 160 ° C, and quickly inject 0.4 ml of cesium source prepared in (a) into the reactant solution, and after 5 seconds of reaction, cool the solution to room temperature with an ice-water bath to obtain the crude product CaPbI 3 @Al-0.5 quantum dot dispersion.

[0056] (c) the crude product CsPbI 3 @...

Embodiment 2

[0059] (a) 0.1628g Cs 2 CO 3 , 0.5mL oleic acid and 8mL 1-octadecene were added to a 50mL three-necked flask, the reaction system was heated to 120°C under vacuum and kept for 1 hour, then nitrogen was introduced into the reaction system and heated to 150°C until Cs 2 CO 3 Completely dissolved to obtain a clear and transparent cesium source solution.

[0060] (b) 0.0867g PbI 2 , 5mL 1-octadecene, 0.7mL oleic acid, 0.7mL oleylamine and 110mg aluminum distearate were added to a 50mL three-necked flask, and the reaction system was heated to 120°C under vacuum until the reactants were completely dissolved and kept for 1 hour , then feed nitrogen into the reaction system and heat to 160 ° C, and quickly inject 0.4 ml of cesium source prepared in (a) into the reactant solution, and after 5 seconds of reaction, cool the solution to room temperature with an ice-water bath to obtain the crude product CaPbI 3 @Al-1 quantum dot dispersion.

[0061] (c) the crude product CsPbI 3 @A...

Embodiment 3

[0064] (a) 0.1628g Cs 2 CO 3 , 0.5mL oleic acid and 8mL 1-octadecene were added to a 50mL three-necked flask, the reaction system was heated to 120°C under vacuum and kept for 1 hour, then nitrogen was introduced into the reaction system and heated to 150°C until Cs 2 CO 3 Completely dissolved to obtain a clear and transparent cesium source solution.

[0065] (b) 0.0867g PbI 2 , 5mL 1-octadecene, 0.7mL oleic acid, 0.7mL oleylamine and 165mg aluminum distearate were added to a 50mL three-necked flask, and the reaction system was heated to 120°C under vacuum until the reactants were completely dissolved and kept for 1 hour , then feed nitrogen into the reaction system and heat to 160 ° C, and quickly inject 0.4 ml of cesium source prepared in (a) into the reactant solution, and after 5 seconds of reaction, cool the solution to room temperature with an ice-water bath to obtain the crude product CaPbI 3 @Al-1.5 quantum dot dispersion.

[0066] (c) the crude product CsPbI 3 ...

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Abstract

The invention discloses an aluminum distearate coating method for improving the stability of perovskite quantum dots. The method includes the steps of: adding lead halide and aluminum distearate in amolar ratio of 1:(0.2-2) into a mixed solution of oleylamine, oleic acid and 1-octadecene in a volume ratio of 0.7:0.7:5, conducting heating stirring under a vacuum condition to obtain a lead halide precursor solution, heating the lead halide precursor solution under the protection of nitrogen, injecting a cesium source solution, carrying out reaction, then performing cooling to room temperature to obtain a crude product aluminum distearate coated colloidal perovskite quantum dot dispersion liquid, and performing purification to obtain an aluminum distearate coated colloidal perovskite quantumdot dispersion liquid. The stearic acid in the aluminum distearate adopted by the invention can be combined with metal ions on the surfaces of the perovskite quantum dots to effectively passivate thesurface defects of the quantum dots, thus increasing the fluorescence quantum yield, and improving the chemical and optical stability of the quantum dots under illumination, high temperature and polar environments.

Description

technical field [0001] The invention belongs to the technical field of optoelectronic material preparation, in particular to an aluminum distearate coating method for improving the stability of perovskite quantum dots. Background technique [0002] Colloidal perovskite quantum dots have shown potential application prospects in photovoltaic and optoelectronic fields such as solar cells, light-emitting diodes, photodetectors, and lasers due to their unique optoelectronic properties and low-cost and easy-to-process advantages. However, the ionic crystal characteristics of perovskite quantum dots lead to poor crystal structure stability and ligands are easy to fall off, especially in polar solvent environments or under conditions such as light and high temperature, which are prone to decomposition or phase transition, resulting in their The optoelectronic performance degrades rapidly. [0003] Surface coating is a common and effective method to improve the stability of perovski...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/66
CPCC09K11/025C09K11/665
Inventor 李艳薛炜楠王晓燕王元何芳芳
Owner EAST CHINA UNIV OF SCI & TECH
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