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Fluorescent perovskite nanocrystal, and preparation method and application thereof

A perovskite and nanocrystal technology, applied in the field of semiconductor nanomaterial preparation, can solve the problems of limited practical application, inability to meet the storage and protection of confidential information, photoinduced phase transformation can not be repeated, etc., to increase security and fluorescence performance. Excellent, easy-to-synthesize results

Active Publication Date: 2019-03-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method and material still cannot meet the needs of storage and protection of confidential information, because as the ink for recording information, the two-dimensional perovskite material itself still has blue fluorescence characteristics, which leads to the fact that the information recorded by it is in the light. It can still be recognized by the naked eye under excitation; secondly, this photoinduced phase inversion process cannot be repeated, which also limits its practical application
At present, there are no reports on the application of fluorescent perovskite nanocrystals in the field of confidential information storage and protection

Method used

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  • Fluorescent perovskite nanocrystal, and preparation method and application thereof
  • Fluorescent perovskite nanocrystal, and preparation method and application thereof
  • Fluorescent perovskite nanocrystal, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Synthesis of methylaminolead bromide (MAPbBr) based on Pb-MOF 3 )Nanocrystalline

[0037] (1) Synthesis of Pb-MOF: 90mL 1,3,5-H 3 BTC aqueous solution (0.01M) and 10mL Pb(NO 3 ) 2 The aqueous solution (0.09M) was mixed and stirred continuously for 30 minutes, the obtained powder was washed three times with deionized water and methanol, and finally dried in vacuum at 150°C for 12 hours;

[0038] (2) MAPbBr 3 Synthesis of nanocrystals: Disperse 200 mg of synthesized Pb-MOF powder in 10 mL of n-hexane to form a suspension, and stir to make it uniformly dispersed. Dissolve 10 mg of aminobromide (MABr) in 1 mL of n-butanol, and sonicate to dissolve it completely. Add 0.5mL of the above MABr solution to the Pb-MOF suspension quickly, and keep stirring for 30s, then filter or centrifuge the above dispersion, and wash with butanol once to remove the unreacted MABr, then the MOF embedded in MAPbBr 3 Nanocrystalline powder. The Pb-MOF prepared in this example is as figur...

Embodiment 2

[0040] Synthesis of cesium lead bromide (CsPbBr) based on Pb-MOF 3 )Nanocrystalline

[0041] (1) Synthesis of Pb-MOF: same as the preparation method in Example 1;

[0042] (2) CsPbBr 3 Synthesis of nanocrystals: similar to the preparation method in Example 1, the difference is that the Pb-MOF dispersion solvent is selected as toluene, and 10 mg of cesium bromide (CsBr) is dissolved in 1 mL of methanol during the preparation of the cationic halide salt solution for the conversion reaction . CsPbBr embedded in MOF prepared in this example 3 The fluorescence spectra of nanocrystalline powders are as follows: Figure 5 It is shown that the fluorescence emission wavelength is 529nm, indicating that the method has good versatility.

Embodiment 3

[0044] Synthesis of mixed halogen perovskites (MAPbI) based on Pb-MOF conversion x Br 3-x-y Cl y )Nanocrystalline

[0045] (1) Synthesis of Pb-MOF: same as the preparation method in Example 1;

[0046] (2) MAPbI x Br 3-x Synthesis of nanocrystals: similar to the preparation method in Example 1, the difference lies in the preparation of the cationic halide salt solution used for the conversion reaction. For x=0, y=3, dissolve 10 mg MACl in 1 mL n-butanol; for x=0, y=1, dissolve 2.32 mg MACl and 7.68 mg MABr in 1 mL n-butanol; for x=0, For y=2, dissolve 5.47 mg MACl and 4.53 mg MABr in 1 mL n-butanol; for x=1, y=0, dissolve 4.15 mg MAI and 5.85 mg MABr in 1 mL n-butanol, for x=2, y =0, 7.40 mg MAI and 2.60 mg MABr were dissolved in 1 mL n-butanol. The mixed halogen perovskite (MAPbI x Br 3-x-y Cl y ) Fluorescence spectra of nanocrystals such as Image 6 As shown, the fluorescence emission wavelength can be tuned from 406 nm to 746 nm with the change of halogen from Cl...

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Abstract

The invention relates to a fluorescent perovskite nanocrystal, and a preparation method and application thereof. The structure of the fluorescent perovskite nanocrystal is MOF-ABX3, wherein the mass ratio of MOF to ABX3 is (1-50):(0.1-5). A cationic halide salt solution used for perovskite synthesis is added into a metal organic framework dispersion liquid, and obtained perovskite nanocrystals areuniformly dispersed in metal organic framework crystals. Good fluorescence performance is achieved, and the method has universality. The synthesis method of the perovskite nanocrystal provided by theinvention can be directly used in applications of storage and protection of confidential information. Compared with the prior art, the operation process is simple and repeatable, the metal organic framework material and recorded information are very safe (absorption and fluorescence characteristics are avoided in a visible light range, and recognition by naked eyes is avoided), and the perovskitenanocrystal has a good fluorescence characteristic, so that the perovskite nanocrystal can be directly applied to the field of storage and protection of confidential information.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanomaterial preparation, and in particular relates to a perovskite nanocrystal synthesized through repeated conversion of a metal organic framework, a preparation method thereof and an application in storage and protection of confidential information. Background technique [0002] Smart fluorescent materials with stimuli responses have a wide range of applications in fields such as information security. This kind of material generally regulates the arrangement mode of molecules through external stimuli (such as light, electricity, heat, mechanical force, etc.), so as to achieve the purpose of changing the fluorescent signal of the material. Fluorescent materials currently used in this field include various organic compounds, metal complexes, inorganic quantum dots, up-conversion nanoparticles, and so on. However, these materials still have many disadvantages, such as: poor fluorescence per...

Claims

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Application Information

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IPC IPC(8): C09K11/06C09K11/66C09K11/74
CPCC09K11/06C09K11/665C09K11/7435B82Y40/00C01G21/16C09K11/66C09K11/74
Inventor 李良张从阳
Owner SHANGHAI JIAO TONG UNIV
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