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A preparation method of quasi-low-dimensional bismuth-based perovskite nanomaterials

A technology of perovskite materials and nanomaterials, which is applied in the field of preparation of quasi-low-dimensional bismuth-based perovskite nanomaterials, can solve the problems of complex synthesis methods, low yield, and low concentration of nanomaterial colloidal solutions, and overcome the problems of low concentration Effects of low and high fluorescence quantum yields

Active Publication Date: 2019-12-20
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide a preparation method of quasi-low-dimensional bismuth-based perovskite nanomaterials, wherein the overall process design of the key preparation method, the parameter conditions of each step etc. to make improvements, especially by using the strong energy provided by the cell pulverizer and the stripping effect of amines to separate the quasi-low-dimensional bismuth-based perovskite materials. , compared with the prior art, it can effectively solve the problems of complex synthetic method of bismuth-based perovskite nanomaterials, low concentration of the obtained nanomaterial colloidal solution, and low yield. ) powder or bulk material into low-dimensional (such as 0 / 1 / 2-dimensional) nanomaterials, this kind of "from high to low, from existence to non-existence" bismuth-based perovskite nanomaterial synthesis, the synthesis method is simple , and the bismuth-based perovskite nanomaterials prepared by this method are stable and have excellent properties

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  • A preparation method of quasi-low-dimensional bismuth-based perovskite nanomaterials
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preparation example Construction

[0022] The preparation method of the quasi-low-dimensional bismuth-based perovskite nanomaterial in the present invention comprises the following steps: adopting the quasi-low-dimensional bismuth-based perovskite material MA 3 Bi 2 x 9 (X=Cl, Br, I) powder is used as raw material, amine is added as a stripping agent, and n-octane is used as a solvent (other solvents can also be used, as long as they can simultaneously meet: insoluble or slightly soluble perovskite material , needs to be able to dissolve the stripping agent; for example, n-hexane, toluene, methanol / n-octane mixed solvents, etc. can be used); the quasi-low-dimensional bismuth-based perovskite material is split by using the cell pulverizer to give strong energy and the stripping effect of the amine Open to realize the synthesis of new nanomaterials "from high to low, from existence to non-existence"; after centrifugation, take the supernatant to obtain the chemical formula MA 3 Bi 2 x 9 of nanomaterials.

[00...

Embodiment 1

[0028] In this embodiment, the quasi-low-dimensional bismuth-based perovskite nanomaterials, the specific preparation steps are as follows:

[0029] Step 1: Clean a glass bottle; for example, you can clean the white glass bottle with deionized water, acetone, isopropanol, and deionized water for ten minutes each, and then dry it with a nitrogen gun;

[0030] Step 2: Add 0.02mmol MA 3 Bi 2 Br 9 Put it into a glass bottle, add 5mL n-octane and 0.5mL oleic acid to the bottle as solvent and ligand respectively, and then add 100uL n-octylamine as stripping agent;

[0031] Among them, the raw material MA 3 Bi 2 Br 9 It is a quasi-2-dimensional bismuth-based perovskite powder;

[0032] Step 3: Put the glass bottle into the cell pulverizer and adjust the power to 45 (that is, the power is 300W) and start pulverizing for 30 minutes;

[0033] Step 4: Take out the suspension in the glass bottle, centrifuge it at 8000rpm and take the supernatant to obtain a pale yellow colloidal so...

Embodiment 2

[0035] In this embodiment, the quasi-low-dimensional bismuth-based perovskite nanomaterials, the specific preparation steps are as follows:

[0036] Step 1: Clean a glass bottle; wash the white glass bottle with deionized water, acetone, isopropanol, and deionized water for ten minutes each, and then dry it with a nitrogen gun;

[0037] Step 2: Add 0.02mmol MA 3 Bi 2 I 9 Put it into a glass bottle, add 5mL n-octane and 0.5mL oleic acid to the bottle as solvent and ligand respectively, and then add 200uL n-octylamine as stripping agent;

[0038] Among them, the raw material MA 3 Bi 2 I 9 It is a quasi-0-dimensional bismuth-based perovskite powder;

[0039] Step 3: Put the glass bottle into the cell pulverizer, adjust the power to 45 and start pulverizing for 30 minutes;

[0040] Step 4: Take out the suspension in the glass bottle, centrifuge it at 8000rpm and take the supernatant to obtain a light red Bi-based perovskite quantum dot colloidal solution.

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Abstract

The invention discloses a preparation method of a quasi-low dimensional bismuth based perovskite nano material. The preparation method comprises following steps: adopting a quasi-low dimensional bismuth based perovskite material (MA3Bi2X9) powder as the raw material; taking amine as a peeling agent; using a solvent to obtain a mixture; then processing the mixture by a cell disruptor; carrying outcentrifugation, and saving the supernate namely the nano material MA3Bi2X9. The overall technological process design and parameters of all steps are improved, the quasi-low dimensional bismuth based perovskite material is split by the strong power provided by the cell disruptor and the peeling effect of amine, at the same time, the kinds and ratio of raw materials are controlled, during the grinding process, the specific power and time are controlled, and compared with the prior art, solved are the problems that in the prior art, the synthesis method is complicated, the concentration of obtained nano material colloidal solution is low, and the yield is low.

Description

technical field [0001] The invention belongs to the field of photoelectric material preparation, and more specifically relates to a preparation method of a quasi-low-dimensional bismuth-based perovskite nanomaterial. Background technique [0002] Perovskite nanomaterials have broad application prospects in the field of light-emitting displays due to their high quantum yield, low cost, and simple preparation methods. [0003] Perovskite nanomaterials can use halogen elements and size effects to adjust their luminescence properties (mainly luminescence wavelength), so their luminescence spectrum can cover the entire visible light region (400-800nm), which has great potential in LED applications. However, the current research on perovskite nanomaterials is mainly aimed at Pb-based, and it is difficult to replace Pb with new non-toxic elements due to high defect concentration or poor stability of the material. Only ligand-assisted reprecipitation of Bi Sn-based non-toxic perovs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/74B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09K11/7428
Inventor 唐江冷美英陈正午牛广达杨颖
Owner HUAZHONG UNIV OF SCI & TECH
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