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Core-shell perovskite quantum dot and preparation method thereof, quantum dot composition and quantum dot device having the same

A core-shell perovskite and quantum dot technology, applied in the field of quantum dot materials, can solve the problems of poor stability of perovskite quantum dots, achieve the effect of maintaining stable fluorescence quantum yield and improving stability

Active Publication Date: 2022-07-29
NANJING TECH CORP LTD
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  • Summary
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  • Description
  • Claims
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Problems solved by technology

[0005] The main purpose of the present invention is to provide a core-shell perovskite quantum dot and its preparation method, quantum dot composition and quantum dot device with it, to solve the problem of poor stability of perovskite quantum dots in the prior art

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  • Core-shell perovskite quantum dot and preparation method thereof, quantum dot composition and quantum dot device having the same
  • Core-shell perovskite quantum dot and preparation method thereof, quantum dot composition and quantum dot device having the same
  • Core-shell perovskite quantum dot and preparation method thereof, quantum dot composition and quantum dot device having the same

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[0026] The perovskite quantum dots described in the background art are ionic semiconductor materials with poor water resistance, oxygen resistance, light resistance and high temperature resistance. Moreover, conventional perovskite quantum dots are unstable in polar solvents and easily decomposed. The inventor of the present invention provides a preparation method of core-shell perovskite quantum dots in view of the above-mentioned technical problems, comprising the following steps:

[0027] S1, mixing and reacting cesium carboxylate, lead carboxylate, a halogen precursor containing metal M and a non-coordinating solvent to obtain a first solution containing perovskite quantum dots, and the surface of the perovskite quantum dots has a carboxyl group of metal M acid ligand;

[0028] S2, mixing the first solution with ammonia water and performing the first ligand exchange reaction to obtain a second solution containing perovskite quantum dots;

[0029] S3, mix the second solut...

Embodiment 1

[0055] This embodiment provides a kind of cesium lead bromide (CsPbBr 3 ) The synthesis method of perovskite quantum dots coating ZnS and silica shell, comprising the following steps:

[0056] Take 0.4mL 0.5mmol / mL lead oleate solution, 3mL 0.1mmol / mL ZnBr 2 - Oleic acid solution, 5 mL of ODE in a three-necked flask and stirred. The flask was evacuated with an inert gas for 30 minutes, and the temperature was raised to 200° C., and then 1 mL of a 0.2 mmol / mL cesium oleate solution was injected and reacted for 3 minutes. The temperature was lowered to 80° C., 0.198 g of ammonia water was injected into the flask, and the reaction was carried out for 5 min. 2 mL of 1 mmol / mL 3-mercaptopropyltrimethoxysilane was injected into the flask, and reacted at 80 °C for 40 min, and then 0.1 mL of 0.035 mmol / mL diluted hydrochloric acid was injected into the flask, and the reaction was performed at 80 °C for 10 min. , stop the reaction.

Embodiment 2

[0058] This embodiment provides a kind of cesium lead bromide (CsPbBr 3 ) The synthesis method of perovskite quantum dots coating CdS and silica shell, comprising the following steps:

[0059] Take 0.4mL 0.5mmol / mL lead oleate solution, 3mL 0.1mmol / mL CdBr 2- Oleic acid solution, 5 mL of ODE in a three-necked flask and stirred. The flask was vented with inert gas for 30 minutes. After the temperature was raised to 200° C., 1 mL of a 0.2 mmol / mL cesium oleate solution was injected, and the mixture was reacted for 3 minutes. The temperature was lowered to 80° C., 0.198 g of ammonia water was injected into the flask, and the reaction was carried out for 5 min. 2 mL of 1 mmol / mL 3-mercaptopropyltrimethoxysilane was injected into the flask, and reacted at 80°C for 40 min, then 0.1 mL of 0.035 mmol / mL dilute hydrochloric acid was injected into the flask, and after 10 min of reaction at 80°C, Stop the reaction.

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Abstract

The invention provides a core-shell perovskite quantum dot and a preparation method thereof, a quantum dot composition and a quantum dot device having the same. The preparation method includes: mixing and reacting cesium carboxylate, lead carboxylate, a halogen precursor containing metal M, and a non-coordinating solvent to obtain a first solution containing perovskite quantum dots, and the surface of the perovskite quantum dots has metal carboxylate ligand of M; mix the first solution with ammonia water and perform the first ligand exchange reaction to obtain a second solution containing perovskite quantum dots; mix the second solution with SHR 1 Si(OCH 3 ) 3 Mix and carry out a second ligand exchange reaction to form M-S chemical bonds on the surface of perovskite quantum dots, and adjust the pH of the reaction system to acidity to obtain a surface-coated sulfide sub-shell layer and a silica outer shell layer. Core-shell perovskite quantum dots, R 1 for C 2 ~C 10 The straight-chain saturated hydrocarbon group or the straight-chain unsaturated hydrocarbon group containing double bonds. The above preparation method keeps the fluorescence quantum yield stable.

Description

technical field [0001] The invention relates to the field of quantum dot materials, in particular to a core-shell perovskite quantum dot and a preparation method thereof, a quantum dot composition and a quantum dot device having the same. Background technique [0002] In recent years, due to the optical and physical properties of perovskite quantum dots, such as high photoelectric conversion efficiency, as well as low preparation costs and simple synthesis methods, they have been widely used in solar cells, quantum dot films, light-emitting diodes, Lasers and other fields have received extensive attention. Moreover, as a light-emitting material, perovskite quantum dots, compared with traditional inorganic semiconductor quantum dots (such as CdSe, CdS, etc.), can be adjusted by adjusting the element ratio and element type in perovskite quantum dots. Can achieve full color gamut coverage. Among perovskite quantum dots, compared with traditional organic-inorganic hybrid perov...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/06C09K11/54H01L51/50
CPCC09K11/06C09K11/54C09K2211/188C09K2211/181C09K2211/10H10K50/11
Inventor 周健海朱晓艳
Owner NANJING TECH CORP LTD
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