Preparation method of perovskite film with high stability and excellent optical property

A technology with optical properties and high stability, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of inability to lower the reaction temperature, instability of perovskite quantum dots, etc., to improve stability and optical properties, and good waterproof sexual effect

Pending Publication Date: 2020-04-17
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a method for preparing a perovskite film with high stability and excellent optical properties, which solves the problems that the reaction temperature cannot be lowered and the inherent instability of perovskite quantum dots in the existing synthesis method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This example provides a method for preparing a perovskite film with high stability and excellent optical properties, using a brand-new ligand 2,2'-iminodibenzoic acid, including the following steps:

[0027] (1) 0.4mmol PbBr 2 , 0.4mmol CsBr was added to 10ml of N,N-dimethylformamide, and after stirring and mixing at room temperature, 1ml of oleic acid, 0.5ml of oleylamine and 2ml of 2,2'-iminodibenzoic acid were added to obtain perovskite Precursor solution;

[0028] (2) Ultrasound is used to disperse 0.5 g of ethylene-vinyl acetate copolymer into 5 ml of toluene, then vigorously stir, and add 150 μl of perovskite precursor solution to obtain a perovskite solution;

[0029] (3) Drop a small amount of perovskite solution on the glass substrate and spread it evenly, and let it stand until the toluene solvent volatilizes to obtain a stable and good perovskite film.

[0030] The external quantum efficiency of the red light-emitting diode made of the perovskite film synth...

Embodiment 2

[0032] This example provides a method for preparing a perovskite film with high stability and excellent optical properties, using a brand-new ligand 2,2'-iminodibenzoic acid, including the following steps:

[0033] (1) 0.3mmol PbBr 2 , 0.3mmol CsBr was added to 10ml of N, N-dimethylformamide, and after stirring and mixing at room temperature, 0.5ml of oleic acid, 0.3ml of oleylamine and 1ml of 2,2'-iminodibenzoic acid were added to obtain calcium titanium Ore precursor solution;

[0034] (2) Use ultrasound to disperse 0.75 g of ethylene-vinyl acetate copolymer into 5 ml of toluene, then vigorously stir, and add 10 μl of perovskite precursor solution to obtain a perovskite solution;

[0035] (3) Drop a small amount of perovskite solution on the glass substrate and spread it evenly, and let it stand until the toluene solvent volatilizes to obtain a stable and good perovskite film.

[0036]The external quantum efficiency of the red light-emitting diode made of the perovskite fi...

Embodiment 3

[0038] This example provides a method for preparing a perovskite film with high stability and excellent optical properties, using a brand-new ligand 2,2'-iminodibenzoic acid, including the following steps:

[0039] (1) 0.5mmol PbBr 2 , 0.5mmol CsBr was added to 10ml of N,N-dimethylformamide, after stirring and mixing at room temperature, 1.5ml of oleic acid, 0.8ml of oleylamine and 3ml of 2,2'-iminodibenzoic acid were added to obtain calcium titanium Ore precursor solution;

[0040] (2) Use ultrasound to disperse 0.6 g of ethylene-vinyl acetate copolymer into 5 ml of toluene, then vigorously stir, and add 300 μl of perovskite precursor solution to obtain a perovskite solution;

[0041] (3) Drop a small amount of perovskite solution on the glass substrate and spread it evenly, and let it stand until the toluene solvent volatilizes to obtain a stable and good perovskite film.

[0042] The external quantum efficiency of the red light-emitting diode made of the perovskite film s...

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Abstract

The invention discloses a preparation method of a perovskite thin film with high stability and excellent optical properties, and belongs to the technical field of perovskite quantum dots. The method comprises the following steps: adding PbBr2 and CsBr into N,N-dimethylformamide, mixing at room temperature, and then adding oleic acid, oleylamine and 2,2'-iminodibenzoic acid to obtain a perovskite precursor solution; ultrasonically dispersing an ethylene-vinyl acetate copolymer into methylbenzene, strongly stirring, and adding the perovskite precursor solution to obtain a perovskite solution; and dropwisely adding a small amount of the perovskite solution on a substrate, uniformly coating, and standing until the methylbenzene solvent volatilizes so as to obtain the stable perovskite film with good performance. According to the invention, a new ligand 2,2'-iminodibenzoic acid is introduced, and the dicarboxyl on the ligand can be bonded with two lead atoms at the same time, so that the stability of the perovskite quantum dot is enhanced to a great extent, a product can be generated at room temperature, and defects generated by a high-temperature reaction are avoided.

Description

technical field [0001] The invention relates to the technical field of synthesis of perovskite quantum dots, in particular to a method for preparing a perovskite thin film with high stability and excellent optical properties. Background technique [0002] The perovskite thin film of the present invention belongs to the technical field of all-inorganic perovskite quantum dot synthesis, and this material is a cesium lead halide (CsPbX 3 , X=Cl, Br, I), which has high quantum yield and narrow emission band, and can adjust its absorption / emission wavelength, and can be used as photodiode (LED), solar energy after spin-coating film formation Active layers of optoelectronic or optoelectronic devices such as batteries and photodetectors. [0003] The existing synthesis method for all-inorganic perovskite quantum dots is mainly high-temperature thermal injection method, and the specific steps are as follows: [0004] (1) First, a certain amount of Cs 2 CO 3 , ODE, and OA were ad...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C09K11/02C09K11/66C08J5/18C08L23/08C08K3/16C08K5/18
CPCC09K11/025C09K11/665C08J5/18C08J2323/08C08K3/16C08K5/18
Inventor张芹刘自磊阳敏张余宝郝中骐黎芳芳
OwnerNANCHANG HANGKONG UNIVERSITY