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A method based on room temperature abx n the y 3-n Ligand regulation method and application of perovskite nanoparticles

A technology of abxny3-n and nanoparticles, which is applied in the field of optoelectronic material preparation, can solve the problems of poor system stability, low injection and transmission capacity, easy aggregation and precipitation, etc.

Active Publication Date: 2021-02-09
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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  • A method based on room temperature abx <sub>n</sub> the y <sub>3-n</sub> Ligand regulation method and application of perovskite nanoparticles
  • A method based on room temperature abx <sub>n</sub> the y <sub>3-n</sub> Ligand regulation method and application of perovskite nanoparticles
  • A method based on room temperature abx <sub>n</sub> the y <sub>3-n</sub> Ligand regulation method and application of perovskite nanoparticles

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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 of 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 12mg didodecyldimethylammonium bromide (DDAB) and dissolve in 1mL toluene, stir and dissolve to obtain the precursor solution of didodecyldimethylammonium bromide of 12mg / mL DDAB. Take 275 μL of cesium precursor and 280 μL of octanoic acid, quickly...

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 20.8mg of the ultrashort ligand formamidine acetate (FA(Ac)) and dissolve it in 1mL of octanoic acid (OTAc), stir and dissolve to obtain a 0.2M 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, and discloses a method based on room temperature ABX n Y 3‑n Ligand control method and application of perovskite nanoparticles. The control method is to mix multiple precursors containing A ions, ultra-short-chain ligands, and sodium ions with fatty acids at room temperature, and quickly inject them into the In the precursor solution of B ions, quickly add the precursor solution of alkyl ammonium halide to it after stirring, and continue to stir to obtain the crude solution of perovskite nanoparticles; after washing, the ligands on the surface are mainly composed of long-chain ligands. ABX composed of alkyl ammonium halides, long-chain ligands fatty acids, ultra-short-chain ligands and metal ligands sodium ions n Y 3‑n Perovskite nanoparticles. The present invention selects ultrashort ligand and metal ligand Na + When added to the precursor, the long-chain ligands on the surface of the obtained perovskite nanoparticles are effectively reduced, and the ultra-short-chain ligands are effectively increased. It has both stability and high-efficiency charge transport characteristics, and can greatly improve the light-emitting diodes based on it. device performance.

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 class of structures such as the "perovskite" crystal structure, the composition of which 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, lighti...

Claims

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Application Information

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Patent Type & Authority Patents(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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