Anti-counterfeiting material and preparation method and application thereof

A technology of continuous reaction and mixture, applied in the fields of application, luminescent materials, chemical instruments and methods, etc., can solve the problems of background fluorescence interference, anti-counterfeiting pattern interference, blurred and difficult to distinguish patterns, etc., and achieve wide absorption range, avoid interference, and luminous color pure effect

Active Publication Date: 2018-11-13
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple, low-cost, and easy to operate, but it faces a fatal shortcoming: the interference of background fluorescence
Some literature pointed out that this is due to the addition of additives in the paper making process to achieve whitening, improve its printability and light transmittance, but these chemical additives can be excited by ultraviolet light to produce strong background fluorescence, Seriously interfere with fluorescent dye-based anti-counterfeiting patterns and even cause patterns to be blurred

Method used

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  • Anti-counterfeiting material and preparation method and application thereof
  • Anti-counterfeiting material and preparation method and application thereof
  • Anti-counterfeiting material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The inventors of the present invention have found through research that the UCNPs material doped with lanthanide elements can emit visible light through anti-Stokes transition under the excitation of infrared laser, and emit in a narrow band. On the other hand, the absorption spectrum of IPQDs materials has a wide range of wavelengths, which can be excited by light in multiple bands, and therefore, can also be excited by the emitted light of UCNPs. If the two materials of UCNPs and IPQDs can be combined, it will not only be a luminescent material with excellent performance, but also the composite material can be excited by infrared light to emit visible light, which will be a good anti-counterfeiting material.

[0046] Based on the above findings, an embodiment of the present invention provides an anti-counterfeiting material, the anti-counterfeiting material includes a UCNPs material and an IPQDs material with a core-shell structure, and the up-conversion luminescent na...

Embodiment 2

[0049] The embodiment of the present invention provides the preparation method of the anti-counterfeiting material in the embodiment 1, specifically mixing the UCNPs material and the IPQDs material by a physical method, that is, simply blending the two materials.

[0050] The preparation methods of UCNPs materials and IPQDs materials are introduced respectively as follows:

[0051] UCNPs materials are prepared by co-precipitation method, specifically, as figure 1 As shown, the preparation method of UCNPs material includes steps S101-S113:

[0052] S101, preparing a rare earth acetate solution, mixing the rare earth acetate solution with oleic acid OA to form a first mixture, and reacting at 150° C. for 0.5 h.

[0053] S102, adding 1-octadecene ODE to form a second mixture, and continuing the reaction for 0.5 h.

[0054] S103, cooling the second mixture to 50°C.

[0055] S104, the methanol solution of NaOH and NH 4 The methanol solution of F was mixed rapidly and added to the...

Embodiment 3

[0081] UCNPs NaYF 4 :Yb / Tm(20 / 0.5%)@NaYF 4 Synthesis of (Tm-UCNPs)

[0082] Synthesize NaYF first 4 : Yb / Tm (20 / 0.5%) core nanoparticles. Prepare a solution of rare earth acetate with distilled water. 1.59mL Y(CH 3 CO 2 ) 3 (0.20molL -1 ) solution, 2.00mL Yb(CH 3 CO 2 ) 3

[0083] (0.04molL -1 ) solution and 0.10mL Tm(CH 3 CO 2 ) 3 (0.02molL -1 ) solution was mixed with 3mL OA in a 50mL two-necked flask. The mixture was heated and stirred at 150 °C for 0.5 h. Then, 7 mL of ODE was added to the mixture and reacted at 150 °C for another 0.5 h. After the reaction mixture was cooled to below 50°C, 2 mL of NaOH in methanol (0.50 molL -1 ) and 4mL NH 4 Methanol solution of F (0.40molL -1 ) were quickly mixed and poured into reaction vials. The above mixture was reacted at 50° C. for 0.5 h, and then after the temperature was raised to 100° C., the flask was connected to a Schlenk double row tube. React under vacuum for 15 min to remove the low-boiling solvent, ...

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Abstract

The invention relates to an anti-counterfeiting material which comprises an upconversion luminescent nano-UCNPs material with a core-shell structure and an inorganic perovskite quantum dot IPQDs material. The UCNPs material can excite visible light by infrared light, and emission light covers a region from ultraviolet light to infrared light, while the IPQDs material has wide absorption range andcan be excited by ultraviolet-visible light, an emission spectrum has a narrow half-peak width, and the light-emitted color is pure. According to the anti-counterfeiting material, after the upconversion luminescent nanomaterial and the inorganic perovskite quantum dot material are mixed, the emission light of the inorganic perovskite quantum dots is only showed under infrared light excitation. Therefore, ultraviolet light is not required to be used as excitation light, and the interference of background fluorescence can be avoided when the anti-counterfeiting material is used for counterfeiting prevention on a paper base. The invention also provides a preparation method of the anti-counterfeiting material and an application for printing, spraying or printing counterfeiting prevention.

Description

technical field [0001] The invention relates to the field of anti-counterfeiting technology based on new materials, in particular to the preparation of nanometer materials and their application in the field of anti-counterfeiting. Background technique [0002] In today's information age, although more and more information dissemination is carried out through electronic media, paper is still one of the important carriers for information storage and dissemination, and paper-based anti-counterfeiting technology is still indispensable. The traditional anti-counterfeiting method is to use fluorescent dyes to print anti-counterfeiting patterns, and the printed anti-counterfeiting patterns can be identified by being excited by ultraviolet light, so as to achieve the purpose of anti-counterfeiting. This method is simple, low-cost, and easy to operate, but it faces a fatal shortcoming: the interference of background fluorescence. Some literature pointed out that this is due to the a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85C09K11/66C09D11/50
CPCC09D11/50C09K11/665C09K11/7773
Inventor 吴静饶梦囡
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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