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Ligand regulation and control method of ABXnY3-n perovskite nanoparticles based on room temperature method and application

An abxny3-n, nanoparticle technology, used in the field of optoelectronic material preparation, can solve the problems of poor film formation flatness, low solubility, and poor system stability.

Active Publication Date: 2020-05-08
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] For the above defects or improvement needs of the prior art, the object of the present invention is to provide a method based on room temperature method ABX n Y 3-n Ligand regulation method and application of perovskite nanoparticles, by selecting ultrashort ligands and metal ligands Na + added to the precursor, resulting in the resulting ABX n Y 3-n The long-chain ligands on the surface of perovskite nanoparticles are effectively reduced, and the ultra-short-chain ligands are effectively increased, which has both stability and high-efficiency charge transport characteristics, so as to solve the charge injection and transport capabilities of perovskite nanoparticles synthesized by the prior art Low temperature, poor film formation flatness, poor system stability, easy agglomeration and precipitation during storage, and low solubility, thereby greatly improving the device performance of light-emitting diodes based on it

Method used

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  • Ligand regulation and control method of ABXnY3-n perovskite nanoparticles based on room temperature method and application
  • Ligand regulation and control method of ABXnY3-n perovskite nanoparticles based on room temperature method and application
  • Ligand regulation and control method of ABXnY3-n perovskite nanoparticles based on room temperature method and application

Examples

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Embodiment 1

[0083] The present embodiment provides a kind of Na without Na in the present invention + Synthesis of CsPbBr by Synergistic Regulation with Ultrashort Ligands 3 The preparation of nanoparticles and corresponding electroluminescent devices comprises the following steps:

[0084] 1. Synthesis of CsPbBr 3 Nanoparticles: Weigh 32.58 mg cesium carbonate (Cs 2 CO 3 ) was dissolved in 1 mL octanoic acid (OTAc), stirred and dissolved to obtain 0.1M Cs 2 CO 3 Cesium precursor. Weigh 458.75mg lead bromide (PbBr 2 ) and 1366.9mg of tetra-n-octylammonium bromide (TOAB) were dissolved in 25mL of toluene, stirred and dissolved to obtain Pb 2+ The concentration is 0.05M and PbBr 2 : TOAB = 1:2 molar ratio of the lead precursor. Weigh 12 mg of didodecyldimethylammonium bromide (DDAB) and dissolve it in 1 mL of toluene, stir and dissolve to obtain a precursor solution of 12 mg / mL DDAB of didodecyldimethylammonium bromide. Take 275 μL of cesium precursor and 280 μL of octanoic acid, ...

Embodiment 2

[0087] This example provides a method for synthesizing CsPbBr by using only ultrashort ligands to regulate ligands on the surface of nano-perovskite 3 Preparation of nanoparticles and corresponding electroluminescent devices.

[0088] The difference between this embodiment and embodiment 1 is only: in synthesizing CsPbBr 3 In the nanoparticle step, an additional step: Weigh 20.8 mg of the ultrashort ligand formamidine acetate (FA(Ac)) and dissolve it in 1 mL of octanoic acid (OTAc), stir and dissolve to obtain a 0.2 M formamidine acetate precursor. And the substance finally injected into the lead precursor solution was obtained by mixing 275 μL cesium precursor solution, 60 μL formamidine acetate and 220 μL octanoic acid, and the rest of the steps were the same.

Embodiment 3

[0090] This embodiment provides a method that only utilizes the metal ligand Na + CsPbBr obtained by adjusting ligands on the surface of nano perovskite 3 Synthesis of nanoparticles and fabrication of corresponding electroluminescent devices.

[0091] The difference between this embodiment and embodiment 1 is only: synthetic CsPbBr 3 In the nanoparticle step, increase step: weigh 10.6mg sodium carbonate (Na 2 CO 3 ) was dissolved in 1 mL octanoic acid (OTAc), stirred and dissolved to obtain 0.1M Na 2 CO 3 Sodium precursor. And the substance finally injected into the lead precursor solution was obtained by mixing 275 μL cesium precursor solution, 100 μL sodium carbonate solution and 180 μL octanoic acid, and the rest of the steps were the same.

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Abstract

The invention belongs to the field of optoelectronic materials. The invention discloses a ligand regulation and control method of ABXnY3-n perovskite nanoparticles based on a room temperature method and application. The regulation and control method comprises the following steps: mixing a plurality of precursor solutions containing A ions, ultrashort chain-containing ligands and sodium ions with fatty acid at room temperature, rapidly injecting the mixture into a precursor solution containing B ions, rapidly adding a precursor solution of alkyl ammonium halide into the precursor solution containing B ions after stirring, and continuously stirring to obtain a crude solution of perovskite nanoparticles; and washing to obtain the ABXnY3-n perovskite nanoparticles of which the ligand on the surface is mainly composed of a long-chain ligand alkyl ammonium halide, a long-chain ligand fatty acid, an ultra-short-chain ligand and metal ligand sodium ions. According to the invention, the ultra-short ligand and the metal ligand Na < + > are selected and added into the precursor, so that the surface long-chain ligands of the obtained perovskite nanoparticles are effectively reduced, the ultra-short-chain ligands are effectively increased, the perovskite nanoparticles have both stability and high-efficiency charge transfer characteristic, and the device performance of a light emitting diodebased on the perovskite nanoparticles can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of optoelectronic material preparation, more specifically, relates to a method based on room temperature ABX n Y 3-n Ligand regulation method and application of perovskite nanoparticles. n Y 3-n A method for ligand distribution on the surface of perovskite nanoparticles. Background technique [0002] Perovskite materials usually refer to a type of structure such as "perovskite" crystal structure, and the composition is ABX 3 (wherein A=MA, FA, Cs, GA; B=Pb, Sn, Bi, Sb, etc.; X=Cl, Br, I) a class of compounds. Due to its extremely high fluorescence quantum yield (PLQY), extremely narrow half-maximum width (FWHM), easy-tunable bandgap, broadband absorption, few defects, and high carrier mobility, perovskite materials are widely used in optoelectronics. The field has shown great potential for development, and has caused a research boom in the fields of solar cells, photodetection, lasers, lighting, and dis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/66H01L51/50H01L51/56B82Y30/00B82Y40/00
CPCC09K11/025C09K11/665B82Y30/00B82Y40/00H10K71/10H10K71/40H10K50/11
Inventor 王磊张瑞陈虹婷阳妃
Owner HUAZHONG UNIV OF SCI & TECH
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