Novel invisible anti-counterfeiting two-dimensional code based on nano metal organic frame material

Abstract

The invention relates to a novel invisible anti-counterfeiting two-dimensional code based on a nano metal organic frame material. The novel invisible anti-counterfeiting two-dimensional code printed by nano metal organic frame material ink comprises visible coding blocks which are adjustable in number and identical in size and three black apex positioning square blocks and is characterized in thatfluorescent colors, excited under specific wavelengths, of the coding blocks are used as the information storage units, the fluorescent colors of the encoding blocks carry coding information, nearlyinfinitely many fluorescent colors can be acquired by using an ink-jet printer to mix three-primary-color fluorescence-emission ink, and accordingly infinitely much coding information is achieved; thecapacity of the coding information can be regulated by regulating the number of the unit coding blocks; the three-primary-color fluorescence-emission nano-scale invisible ink needs to be prepared inorder to prepare the novel invisible anti-counterfeiting two-dimensional code; the three-primary-color and mixed-color ink does not display the colors under sunlight and can emit different-color fluorescence under the excitation of single-wavelength light.

Description

technical field [0001] The invention belongs to the application field of inkjet printing invisible anti-counterfeiting two-dimensional codes, and in particular relates to an anti-counterfeiting code based on fluorescent colors as information storage content. The content involves the preparation of three-primary-color fluorescent emission ink under single excitation, and realizes full-color inkjet printing of invisible fluorescent anti-counterfeiting two-dimensional codes according to the principle of three-primary colors. Background technique [0002] The problem of counterfeiting has become a global problem that threatens businessmen, enterprises, governments, finances and even human health. Therefore, there is an urgent need to develop some anti-counterfeiting technologies that are difficult to copy and easy to authorize to protect important documents, luxury goods, currency, medicines, certificates, etc. In recent years, two-dimensional codes based on photolithography, l...

AI Technical Summary

Problems solved by technology

[0003] At present, there are several types of fluorescent anti-counterfeiting two-dimensional codes: Rare earth metal up-conversion nanoparticles, such luminescent materials have adjustable fluorescence, high resolution and strong photostability, such as, 1) Meruga, J.M., Baride, A., Cross, W., Kellar, J.J.&May, P.S. Red-green-blue printing using luminescence-upconversion inks. Journal of Materials Chemistry C 2014, 2, 2221. However, the synthesis method of this kind of luminescent material is complicated and difficult to overcome, and it needs daily difficult Long-wavelength lasers used; easy preparation of carbon dots or quantum dots or fluorescent organic dyes, such as, 2) Jiang, K. et al. Triple-Mode Emission of Carbon Dots: Applications for Advanced Anti-Counterfeiting. Angewandte Chemie 2016, 55, 7231 -7235; 3) Hou, X. etal. Tunable solid-state fluorescent materials for supramolecular encryption. Nature Communications 2015, 6, 6884; 4) Kumar, P., Singh, S. & Gupta, B.K. Future prospects of luminescent nanomaterial based security inks : fromsynthesis to anti-counterfeiting applications. Nanoscale 2016,8,14297-14340

However, such materials have limited emission wavelengths and are prone to photobleaching

The synthesis of the above materials is complex and the steps are cumbersome, which limits their application in inkjet printing of anti-counterfeiting two-dimensional codes

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