Triple anti-counterfeiting material based on perovskite composite structure and its application

A composite structure and composite material technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of single anti-counterfeiting and insufficient use, and achieve the effect of security

Active Publication Date: 2019-11-08
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fluorescent anti-counterfeiting material is an important anti-counterfeiting means. The Chinese patents with publication numbers CN104760437A and CN204451417U all provide a kind of fluorescent material, which produces obvious fluorescent colors different from those under sunlight under ultraviolet light, but most of them are single anti-counterfeiting , it is obviously not enough for the current market, and multiple anti-counterfeiting has become a new market demand

Method used

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  • Triple anti-counterfeiting material based on perovskite composite structure and its application
  • Triple anti-counterfeiting material based on perovskite composite structure and its application
  • Triple anti-counterfeiting material based on perovskite composite structure and its application

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preparation example Construction

[0027] see figure 1 , figure 2 and image 3 As shown, the triple anti-counterfeiting material based on the perovskite composite structure of the present invention is prepared by the preparation method of the triple anti-counterfeiting material based on the perovskite composite structure. The preparation method comprises the following steps:

[0028] 1), combine CsX and PbX 2 Dissolved in an organic solvent to obtain CsPbX 3 Perovskite precursor solution, where, CsX and PbX 2 The molar ratio is 1:1. Among them, CsX and PbX in the perovskite precursor solution 2 The concentration is 0.1~0.5mol / L. Organic solvents are DMSO, DMF and γ-butyrolactone. CsX and PbX 2 In X all are Cl, Br or I.

[0029] 2), CsPbX in step 1) 3 An organic amine and an organic acid are added to the perovskite precursor solution and mixed evenly to obtain a mixed solution, and ZIF-8 powder is immersed in the mixed solution and left to stand to obtain a mixture. Both organic amines and organic ac...

Embodiment 1

[0035] 1) Synthesize metal-organic framework ZIF-8 powder by methanol method;

[0036] 2) Combine 0.532 g CsBr and 0.923 g PbBr 2 Dissolved in 8 g of DMSO, and sonicated to dissolve completely, formulated as CsPbBr 3 Precursor solution;

[0037] 3) Take 3 mL of CsPbBr 3 Add 75 μL oleic acid and oleylamine to the precursor solution, soak ZIF-8 powder in it, and let it stand for 12 h;

[0038] 4) Freeze-dry the mixture in step 3) at -80°C cold trap temperature for 36 h, then grind to obtain CsPbBr 3 / ZIF-8 composite material;

[0039] 5) Excite the composite with UV light with a wavelength of 365 nm.

Embodiment 2

[0041]The same process as in Example 1 was adopted, with the difference that the 365 nm ultraviolet excitation light in step 5) in Example 1 was replaced with 800 nm infrared excitation light.

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Abstract

The invention discloses a perovskite composite structure-based material with three anti-fake characteristics. The material has a first anti-fake characteristic that characteristic fluorescence is generated under the excitation of ultraviolet light, has a second anti-fake characteristic that characteristic fluorescence is generated under the excitation of infrared light, and has a third anti-fake characteristic that fluorescence characteristics are reversible along with temperature. Compared with existing fluorescent anti-fake materials, the perovskite composite structure-based material with the three anti-fake characteristics has multiple anti-fake functions, is safer, and is difficult to imitate as the anti-fake effect relies on the peculiar physicochemical characteristics of the material.

Description

technical field [0001] The invention belongs to the technical field of anti-counterfeiting materials, and in particular relates to a triple anti-counterfeiting material based on a perovskite composite structure. Background technique [0002] In the modern information society, online shopping has become a new trading trend. People can buy commodities from all over the world without leaving home. , Multiple anti-counterfeiting marks will reduce unnecessary losses for consumers. Fluorescent anti-counterfeiting material is an important anti-counterfeiting means. The Chinese patents with publication numbers CN104760437A and CN204451417U all provide a kind of fluorescent material, which produces obvious fluorescent colors different from those under sunlight under ultraviolet light, but most of them are single anti-counterfeiting , It is obviously not enough for the current market, and multiple anti-counterfeiting has become a new market demand. [0003] CaB 3 Perovskite itself ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/06C09K11/66
CPCC09K11/02C09K11/06C09K11/665
Inventor 曾海波许蕾梦陈嘉伟宋继中李建海董宇辉薛洁王涛
Owner NANJING UNIV OF SCI & TECH
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