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Preparation method of perovskite quantum dot/Eu-MOF composite luminescent material

A technology of luminescent materials and quantum dots, applied in luminescent materials, chemical instruments and methods, sustainable buildings, etc., can solve the problems of lack of red light region of white LED and poor stability of perovskite quantum dots, and achieve excellent optical properties, Good dispersion and mild reaction conditions

Active Publication Date: 2020-09-18
JIANGXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of preparation method of perovskite quantum dot / Eu-MOF composite luminescent material, stabilize perovskite quantum dot with Eu-MOF, solve the problem of poor stability of perovskite quantum dot, and solve At present, the problem of missing red light area in white LED

Method used

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  • Preparation method of perovskite quantum dot/Eu-MOF composite luminescent material

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preparation example Construction

[0031] The preparation method of the perovskite quantum dot / Eu-MOF composite luminescent material provided by the application comprises the following steps:

[0032] S1. Europium nitrate hexahydrate and biphenyltetracarboxylic acid are added in the aqueous solution of DMF (N,N-dimethylformamide), and the mol ratio of europium nitrate hexahydrate and biphenyltetracarboxylic acid is 1:(0.2-1 );

[0033] Put the above mixed solution into the reaction kettle and heat it to 100-150°C for 10-48h; naturally cool to room temperature, filter and purify the product, remove the residual DMF (N,N-dimethylformamide), and pass through the vacuum Eu-MOF crystals were obtained after drying;

[0034] In the above scheme, the rigid and highly symmetrical biphenyltetracarboxylic acid is used to prepare Eu-MOF crystals, which has a better energy transfer effect, and then obtains MOF materials with excellent fluorescence properties;

[0035] S2. Combine the dried Eu-MOF crystal with PbBr 2 Afte...

Embodiment 1

[0050] Weigh 1.784g (4mmol) of Eu(NO 3 ) 3 ·6H 2 O, the biphenyltetracarboxylic acid of 0.6605g (2mmol), add the N of 7.5ml under stirring, the H of N-dimethylformamide (DMF) and 2.5ml 2 O solution;

[0051] Then put the above mixed solution in a Teflon autoclave liner with a volume of 50ml, and heat it at 120°C for 48 hours; after cooling, the obtained powder is filtered out and washed with DMF, and then washed with chloroform solution , to remove residual DMF;

[0052] The obtained product was vacuum-dried at 80° C. for 2 hours to obtain Eu-MOF crystals.

[0053] The above-mentioned Eu-MOF crystal 0.4g after drying and the PbBr of 0.1468g 2 Mix and stir for a period of time in 10ml of DMF solution to obtain PbBr 2 Precursor solution of @Eu-MOF;

[0054] to PbBr again 2 Add 0.085g of CsBr solution to @Eu-MOF precursor solution, stir until clear, then add 1ml of oleic acid and 0.5ml of oleylamine;

[0055] Transfer 1ml of the prepared solution to 10ml of toluene solut...

Embodiment 2

[0058] Weigh 1.784g (4mmol) of Eu(NO 3 ) 3 ·6H 2 O, the biphenyltetracarboxylic acid of 0.6605g (2mmol), add the N of 7.5ml under stirring, the H of N-dimethylformamide (DMF) and 2.5ml 2 O solution;

[0059] Then put the above mixed solution in a Teflon autoclave liner with a volume of 50ml, and heat it at 100°C for 48 hours; after cooling, the obtained powder is filtered out and washed with DMF, and then washed with chloroform solution , to remove residual DMF;

[0060] The obtained product was vacuum-dried at 80° C. for 2 hours to obtain Eu-MOF crystals.

[0061] The above-mentioned Eu-MOF crystal 0.4g after drying and the PbBr of 0.1468g 2 Mix and stir for a period of time in 10ml of DMF solution to obtain PbBr 2 Precursor solution of @Eu-MOF;

[0062] to PbBr again 2 Add 0.085g of CsBr solution to @Eu-MOF precursor solution, stir until clear, then add 1ml of oleic acid and 0.5ml of oleylamine;

[0063] Transfer 1ml of the prepared solution to 10ml of toluene solut...

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Abstract

The invention discloses a preparation method of a perovskite quantum dot / Eu-MOF composite luminescent material, which comprises the following steps: S1, adding europium nitrate hexahydrate and biphenyltetracarboxylic acid into a mixed solution of DMF and water, heating, cooling, removing residual DMF, and carrying out vacuum drying to obtain an Eu-MOF crystal, S2, mixing the dried Eu-MOF crystal with a DMF solution of PbBr2 to obtain a precursor solution of PbBr2@Eu-MOF, S3, adding CsBr, stirring until the mixture is clear, adding oleylamine oleate, and then transferring into methylbenzene toprimarily prepare a perovskite quantum dot / Eu-MOF composite luminescent material, and S4, centrifugally dispersing the material in an n-hexane solution, stirring, and filtering out precipitates and the like to prepare the high-purity perovskite quantum dot / Eu-MOF composite light-emitting material, thereby solving the problem of poor stability of perovskite quantum dots and the problem of a red light region loss of the existing white light LED.

Description

technical field [0001] The invention relates to the field of composite luminescent materials, in particular to a method for preparing a perovskite quantum dot / Eu-MOF composite luminescent material. Background technique [0002] All-inorganic perovskite quantum dots CsPbX 3 (X=Cl,Br,I) has the advantages of high quantum yield, tunable emission, narrow emission spectrum and wide color gamut, showing great potential in optoelectronic devices. However, due to their ionic properties, perovskite QDs have poor chemical stability under ambient conditions and are very sensitive to humidity, light, and temperature. In addition, the highly ionized internal bonds make them highly susceptible to ion exchange reactions. How to solve the stability problem of perovskite quantum dots has become an urgent problem to be solved. [0003] MOFs materials have the characteristics of porosity, high specific surface area, unsaturated metal sites, and structural diversity, which endow them with so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/06C09K11/66
CPCC09K11/02C09K11/06C09K11/665Y02B20/00
Inventor 韩修训赖文伟李文辉李博
Owner JIANGXI UNIV OF SCI & TECH
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