Continuous color-changing fluorescent anti-counterfeiting material as well as preparation method and application thereof

Abstract

The invention relates to a continuous color-changing fluorescent anti-counterfeiting material as well as a preparation method and application thereof. The material is Ln < 3 + > / MOF. dye, wherein the amount of dye contained in every 2.4000 g of MOF is 5 * 10 <-6 > mol to 1 * 10 <-4 > mol, and the amount of Ln < 3 + > contained in every 2.4000 g of MOF is 0.016 mol to 0.08 mol. The preparation method comprises the following steps: encapsulating dye molecules into a porous material by adopting a hot reflux method to prepare the MOF. dye, and introducing lanthanide ions into the MOF. dye by adopting a post-functionalization synthesis method to synthesize a new substance structure of the Ln < 3 + > / MOF. dye. The obtained material has the advantages of being high in concealment, high in safety performance, low in multi-mode continuous color-changing light-emitting imitability and the like when applied to the fluorescent anti-counterfeiting aspect, the multi-anti-counterfeiting effect is achieved, the potential in the fluorescent anti-counterfeiting aspect is huge, the application value is high, and the wide application prospect is achieved.

Description

technical field [0001] The invention belongs to the field of anti-counterfeiting materials. A continuous color-changing fluorescent anti-counterfeiting material and its preparation method and application are specifically designed. Background technique [0002] With the rapid development of science and technology and the global economy, the counterfeiting of currencies, trademarks and important documents has become a difficult problem all over the world, seriously damaging the economic interests of countries and individuals. Although many anti-counterfeiting technologies have been developed to combat counterfeiting, such as digital watermarking, quick response (QR) codes, radio frequency identification, computer security technology, etc. However, the above-mentioned anti-counterfeiting technology has the disadvantages of complex preparation process, high technical cost, high toxicity and poor concealability, which make the results unsatisfactory in the actual application pro...

AI Technical Summary

Problems solved by technology

[0005] In the previous article published by our research group (DOl: 10.1021 / acsanm.0c02671), in terms of material structure, since only 8-hydroxyquinoline was encapsulated in the MOF cavity, only Eu 3+ A lanthanide ion, so the prepared substance is only one of this kind of MOF materials, and the structure is only a special case among many new structures, which is not representative and universal, and it is impossible to speculate such a kind of material through this kind of material structure. The characteristics and similarities and differences of the substances; in the preparation method, since the preparation of the same type of MOF materials by the hydrothermal method needs to be sealed in a reactor, the preparation process requires a high temperature and high pressure (temperature can be as high as 180 ° C) environment, with complex synthesis conditions , high risk, high cost of equipment and other disadvantages, which limit the industrial production of such MOF materials and cannot meet the actual needs of anti-counterfeiting materials; in the application of anti-counterfeiting materials, 8-hydroxyquinoline encapsulated in the MOF cavity small molecules, the Eu introduced later 3+ , under the excitation wavelength of 254nm-365nm, the luminescent color can be changed from red to green, which can be applied to ordinary fluorescent anti-counterfeiting, such as ordinary paper anti-counterfeiting, plastic film anti-counterfeiting and LOGO anti-counterfeiting, etc.

However, since the luminous color of the above materials can only be changed from red to green, the luminous color is relatively monotonous, and the path of continuous color change is single, and it is impossible to realize the transition between other luminous colors and the composite luminescence between different luminescent materials. , cannot provide more complex and rich color changes and color change paths under different excitations, thus limiting the deeper application of materials in anti-counterfeiting

Images