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Perovskite quantum dot and preparation method thereof, quantum dot composition, quantum dot device

A quantum dot device, perovskite technology, applied in electric solid devices, semiconductor devices, organic semiconductor devices, etc., can solve the problems of photooxidation, reduce fluorescence quantum yield, poor stability of quantum dots, etc. Excellent stability and the effect of improving stability

Active Publication Date: 2022-06-17
NANJING TECH CORP LTD
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Problems solved by technology

However, after coating silica and alumina, the fluorescence quantum yield will be reduced from 67% to 30%.
The light stability of quantum dots is often associated with water and oxygen. When light is used in the presence of oxygen and water, photooxidation will occur on the surface of quantum dots, resulting in poor stability of quantum dots.

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  • Perovskite quantum dot and preparation method thereof, quantum dot composition, quantum dot device

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[0018] As described in the background art, the perovskite quantum dots obtained by the existing preparation method have poor resistance to high temperature and light, and the stability of the material needs to be improved. In order to solve the above technical problems, the present invention provides a preparation method of perovskite quantum dots, the preparation method includes the following steps: preparing a first solution: mixing a metal halide, an organic acid, a first ligand and / or a second The ligands are mixed and reacted at temperature T1 to obtain a first solution containing a halogen precursor; or a metal halide and an organic acid are mixed and reacted at temperature T1 to obtain a first solution containing a halogen precursor. Prepare the second solution: mix lead carboxylate, cesium carboxylate, second ligand, non-coordinating solvent and optional fatty amine, and react at temperature T2 to obtain the second solution; or mix lead carboxylate, carboxylic acid Ces...

Embodiment 1

[0041] Preparation of 0.5mmol / mL bromine precursor: take 1.689g of zinc bromide, 15mL of trioctylphosphine, and 15mL of oleic acid in a 100mL three-necked flask, raise the temperature to 150°C, and react for 30 minutes.

[0042] Cesium lead bromide (CsPbBr 3 ) Synthesis of perovskite quantum dots: take 0.4 mL of 0.5 mmol / mL lead oleate solution, 1 mL of 0.2 mmol / mL cesium oleate solution, 1 mL of oleyl amine, and 10 mL of ODE in a 100 mL three-neck flask, raise the temperature to 260 °C. Inject 2.4 mL of 0.5 mmol / mL prepared bromine precursor (prepared by zinc bromide), react for 1 minute, and stop the reaction.

Embodiment 2

[0044] Preparation of 0.5mmol / mL chlorine precursor: take 1.02 mL of zinc chloride, 15 mL of trioctylphosphine, and 15 mL of oleic acid in a 100 mL three-necked flask, raise the temperature to 100°C, and react for 30 minutes.

[0045] Cesium lead chloride (CsPbCl 3 ) Synthesis of perovskite quantum dots: take 0.4 mL of 0.5 mmol / mL lead oleate solution, 1 mL of 0.2 mmol / mL cesium oleate solution, 1 mL of oleyl amine, and 10 mL of ODE in a 100 mL three-neck flask, raise the temperature to 260 °C. Inject 2.4 mL of 0.5 mmol / mL prepared chlorine precursor (prepared by zinc chloride), react for 1 minute, and stop the reaction.

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Abstract

The invention provides a method for preparing perovskite quantum dots, comprising the following steps: preparing the first solution: mixing metal halides, organic acids, first ligands and / or second ligands, React to obtain a first solution containing a halogen precursor; or mix metal halides and organic acids, and react at a temperature T1 to obtain a first solution containing a halogen precursor. Prepare the second solution: mix lead carboxylate, cesium carboxylate, second ligand, non-coordinating solvent and optional aliphatic amine, and react at temperature T2 to obtain the second solution; or lead carboxylate, carboxylic acid The cesium, the first ligand, the second ligand, the non-coordinating solvent and the optional aliphatic amine are mixed and reacted at a temperature T2 to obtain a second solution. The first solution and the second solution are mixed and reacted at a temperature T3 to obtain perovskite quantum dots. The finally prepared perovskite quantum dots have high fluorescence quantum yield and excellent stability.

Description

technical field [0001] The invention relates to the technical field of quantum dot materials, in particular to a perovskite quantum dot and a preparation method thereof, a quantum dot composition and a quantum dot device. Background technique [0002] In recent years, due to the optical and physical properties of perovskite quantum dots, such as high photoelectric conversion efficiency and low preparation cost, they have received extensive attention in the fields of solar cells, quantum dot films, and light-emitting diodes. . As a light-emitting material, perovskite quantum dots can cover the full color gamut by adjusting the element ratio and element type in perovskite quantum dots compared to traditional inorganic semiconductor quantum dots (such as CdSe, CdS, etc.). , and the synthesis method is simple and low in cost. Traditional inorganic semiconductor quantum dots often require a coating shell to achieve high fluorescence quantum yield. However, due to the differenc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/66B82Y20/00B82Y40/00H01L33/50H01L51/50H01L51/42H01L51/46
CPCC09K11/025C09K11/665B82Y20/00B82Y40/00H01L33/502H10K30/10H10K50/115H10K2102/00Y02E10/549
Inventor 周健海朱晓艳
Owner NANJING TECH CORP LTD
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