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Zero-dimensional cesium-lead-bromine inorganic perovskite material and preparation method thereof

A zero-dimensional cesium lead and inorganic calcium technology, applied in inorganic chemistry, luminescent materials, chemical instruments and methods, etc., can solve the problems of difficulty in large-scale synthesis and high synthesis cost, and achieve mild and controllable preparation conditions, stable properties, and products. high purity effect

Active Publication Date: 2020-11-17
SHENZHEN UNIV
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Problems solved by technology

[0003] However, since Cs 4 PbBr 6 It is an inorganic material, and its synthetic raw material CsBr is very ionic. It is commonly used as a solvent for the synthesis of organic-inorganic hybrid lead-based halide perovskite materials, such as: 1,4-butyrolactone (GBL), dimethyl Formamide (DMF), dimethyl sulfoxide (DMSO), etc. cannot provide an effective dissolution environment for CsBr raw materials
And the sol method (organic phase), although Cs can be synthesized 4 PbBr 6 Quantum dots, but it is difficult to achieve a large number of synthesis, and the synthesis cost is too high, it is only suitable for a small amount of synthesis in the laboratory
In addition, although HBr hydrobromide can simultaneously dissolve Cs 4 PbBr 6 The precursors of CsBr and PbBr 2 , however, excess Br ions in the system will lead to Cs 4 PbBr 6 Quenching of material fluorescence

Method used

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  • Zero-dimensional cesium-lead-bromine inorganic perovskite material and preparation method thereof
  • Zero-dimensional cesium-lead-bromine inorganic perovskite material and preparation method thereof
  • Zero-dimensional cesium-lead-bromine inorganic perovskite material and preparation method thereof

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preparation example Construction

[0025] The first aspect of the embodiment of the present application provides a method for preparing a zero-dimensional cesium lead bromine inorganic perovskite material, comprising the following steps:

[0026] Dissolving the first lead source in a mixed solution of DMF and DMSO to obtain the first solution;

[0027] CsBr is dissolved in water to obtain a second solution;

[0028] After thermal mixing treatment of the first solution and the second solution, cooling treatment and separation treatment, Cs 4 PbBr 6 Inorganic perovskite materials, that is, zero-dimensional cesium lead bromine inorganic perovskite.

[0029] The zero-dimensional cesium lead bromide (Cs) provided by the first aspect of the application 4 PbBr 6 ) The preparation method of the inorganic perovskite material, using a mixed solvent of DMF and DMSO to dissolve the lead source, using water to dissolve CsBr, and after mixing the first solution and the second solution, a three-solvent system of water-DMS...

Embodiment 1

[0051] a Cs 4 PbBr 6 An inorganic perovskite material, the preparation steps of which include:

[0052] 1. Add 10mmol PbBr 2 Dissolve in a mixed solution of 20mL DMF and 10mL DMSO, and heat to 80-90°C to obtain the first solution;

[0053] 2. Take 4mL of 10Mmol / L CsBr aqueous solution and heat it to 90°C. After clarification, the second solution is obtained;

[0054] 3. Mix and stir the first solution with a temperature of 80-90°C and the second solution with a temperature of about 90°C, and naturally cool to room temperature;

[0055] 4. After centrifugation, the obtained solid was washed twice with toluene and n-hexane with a volume ratio of 1:2, put into a vacuum drying oven, dried for more than 8 hours, and stored dry to obtain Cs 4 PbBr 6 Inorganic perovskite materials.

Embodiment 2

[0057] a Cs 4 PbBr 6 A cyclic preparation method for an inorganic perovskite material, the steps comprising:

[0058] 1. In the mother liquor after centrifugation in Example 1, add the PbBr of 8mmol 2 After fully stirring, add 16ml of 2M CsBr aqueous solution;

[0059] 2. After heating the system to 80°C, continue to stir, and evaporate excess water under low pressure. After the system solution changes from orange to yellow-green, stop heating and cool down to room temperature naturally;

[0060] 3. After centrifugation, the obtained solid was washed twice with toluene and n-hexane with a volume ratio of 1:2, put into a vacuum drying oven, dried for more than 8 hours, and dried to obtain Cs 4 PbBr 6 Inorganic perovskite materials.

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Abstract

The invention belongs to the technical field of perovskite materials, and particularly relates to a preparation method of a zero-dimensional cesium-lead-bromine inorganic perovskite material, which comprises the following steps: dissolving a first lead source in a mixed solution of DMF and DMSO to obtain a first solution; dissolving CsBr in water to obtain a second solution; and carrying out thermal mixing treatment on the first solution and the second solution, cooling and separating to obtain a Cs4PbBr6 inorganic perovskite material, i.e. the zero-dimensional cesium-lead-bromine inorganic perovskite. According to the preparation method of the zero-dimensional cesium-lead-bromine inorganic perovskite material, the phase state of precipitated inorganic perovskite can be selectively regulated and controlled through a three-solvent system of water-DMSO-DMF, and a product is promoted to be precipitated in a Cs4PbBr6 phase as much as possible, the content of CsPbBr3 and CsPb2Br5 phase states in the product is reduced, and the high-purity Cs4PbBr6 inorganic perovskite material is obtained. The preparation method is gentle and controllable in preparation condition and is simple and flexible in operations.

Description

technical field [0001] The application belongs to the technical field of perovskite materials, in particular to a zero-dimensional cesium lead bromine inorganic perovskite material and a preparation method thereof. Background technique [0002] Among all spectra, the human eye is most sensitive to green light, and green fluorescent light-emitting materials are one of the most demanded materials in LEDs. At present, green fluorescent materials are mainly quantum dots, organic materials, and rare earth materials. New Inorganic Perovskite Material Cs 4 PbBr 6 It is a green fluorescent material with a zero-dimensional perovskite structure. It has the advantages of high fluorescence quantum yield and color purity, and small spectral line broadening. It has broad application prospects in fluorescent lamps, electroluminescent devices, and solid-state lasers. [0003] However, since Cs 4 PbBr 6 It is an inorganic material, and its synthetic raw material CsBr is very ionic. It i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66C01G21/16
CPCC09K11/665C01G21/006C01G21/16C01P2002/72C01P2002/82
Inventor 时玉萌周勃李贺楠
Owner SHENZHEN UNIV
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