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Triple optical anti-counterfeiting ink with fluorescence, delayed fluorescence and room temperature phosphorescence and anti-counterfeiting method and application

A technology of delayed fluorescence and room temperature phosphorescence, applied in inks, applications, household appliances, etc., can solve the problems of limited applications, achieve high encryption level, difficult forgery, and convenient operation

Inactive Publication Date: 2021-03-05
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to realize long-life luminescence at room temperature of carbon dot-based composites, carbon dots are usually coated in a specific matrix (polyvinyl alcohol, nano-silica, zeolite and other materials) ([2]K.Jiang, Y.Wang ,C.Cai,H.Lin,Chem.Mater.2017,29,4866-4873), but the solid state of the material greatly limits its application in inkjet advanced optical anti-counterfeiting

Method used

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  • Triple optical anti-counterfeiting ink with fluorescence, delayed fluorescence and room temperature phosphorescence and anti-counterfeiting method and application
  • Triple optical anti-counterfeiting ink with fluorescence, delayed fluorescence and room temperature phosphorescence and anti-counterfeiting method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of carbon dot 1 (NCD1) and carbon dot 1 anti-counterfeiting ink with only fluorescence

[0028] Weigh 1g of folic acid and evenly disperse it in 30mL of toluene, transfer it to a 100mL polytetrafluoroethylene-lined stainless steel reaction kettle, tighten the lid, and conduct a hydrothermal reaction at 290°C for 1h. Allow the reactor to cool down to room temperature naturally, and centrifuge for 5-10 minutes at a rotational speed of 8000 r / min to remove the supernatant. The precipitate was put into a vacuum drying oven, and dried under vacuum at 100° C. for 12 hours to obtain a solid powder of carbon dot 1 . Take 50 mg of carbon dot 1 solid powder and disperse it in 5 mL of deionized water to prepare 10 mg / mL carbon dot 1 anti-counterfeiting ink with only fluorescence.

[0029] Preparation of carbon dot 1 composite powder (NCD1-C)

[0030] Take 15mg of carbon dot 1 solid powder and disperse in 6mL of 1g / mL urea aqueous solution. The mixed solution was tra...

Embodiment 2

[0035] Preparation of carbon dots 2 (NCD2)

[0036] Weigh 1g of folic acid and evenly disperse it in 30mL of N,N-dimethylformamide, transfer it to a 100mL polytetrafluoroethylene-lined stainless steel reaction kettle, tighten the lid of the kettle, and conduct a hydrothermal reaction at 290°C for 1h. Allow the reactor to cool down to room temperature naturally, and centrifuge for 5-10 minutes at a rotational speed of 8000 r / min to remove the supernatant. The precipitate was put into a vacuum drying oven, and dried under vacuum at 100° C. for 12 hours to obtain a solid powder of carbon dot 2 .

[0037] Preparation of carbon dots 2 composite powder (NCD2-C)

[0038] Take 15mg of carbon dot 2 solid powder and disperse in 6mL of 1g / mL urea aqueous solution. The mixed solution was transferred to a three-necked flask, and reacted in an oil bath at 180° C. until solids were precipitated. After natural cooling to room temperature, the carbon dots 2 composite powder containing nitro...

Embodiment 3

[0042] Preparation of carbon dots 3 (NCD3)

[0043] Weigh 1g of folic acid and evenly disperse it in 30mL of acetone, transfer it to a 100mL polytetrafluoroethylene-lined stainless steel reaction kettle, tighten the lid of the kettle, and conduct a hydrothermal reaction at 290°C for 1h. Allow the reactor to cool down to room temperature naturally, and centrifuge for 5-10 minutes at a rotational speed of 8000 r / min to remove the supernatant. The precipitate was put into a vacuum drying oven, and dried under vacuum at 100° C. for 12 hours to obtain a solid powder of carbon dot 3 .

[0044] Preparation of carbon dot 3 composite powder (NCD3-C)

[0045] Take 15mg of carbon dot 3 solid powder and disperse in 6mL of 1g / mL urea aqueous solution. The mixed solution was transferred to a three-necked flask, and reacted in an oil bath at 180° C. until solids were precipitated. After natural cooling to room temperature, the carbon dots 3 composite powder containing nitrogen-doped carbon ...

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Abstract

The invention relates to a triple optical anti-counterfeiting ink with fluorescence, delayed fluorescence and room temperature phosphorescence, as well as an anti-counterfeiting method and an application thereof, which relate to the optical anti-counterfeiting ink. The anti-counterfeiting ink is composed of 1-5 parts of a nitrogen-enriched fluorescent carbon dot material, 720 to 880 of urea, 280 to 320 of biuret, and 25000 to 30000 of an organic solvent. The anti-counterfeiting method comprises: providing a triple optical anti-counterfeiting system having fluorescence, delayed fluorescence androom temperature phosphorescence; obtaining a fluorescent anti-counterfeiting mark under an excitation light source of 250-460 nm, the confidential information stored by the triple anti-counterfeiting ink and the interference information stored by the fluorescent anti-counterfeiting ink; after the excitation light source of 250-320 nm is turned off, obtaining the delayed fluorescent anti-counterfeiting mark, and displaying the confidential information; and after the excitation light source of 330-460 nm is turned off, obtaining the room temperature phosphorescent anti-counterfeiting mark, wherein the color thereof is obviously different from that of the delayed fluorescence. The anti-counterfeiting ink and anti-counterfeiting system are used in ink-jet printers, anti-counterfeiting marks,and information hiding.

Description

technical field [0001] The invention relates to an optical anti-counterfeit ink, in particular to a triple optical anti-counterfeit ink with fluorescence, delayed fluorescence and room temperature phosphorescence, an anti-counterfeit system and its application. Background technique [0002] Counterfeiting is a worldwide problem and has caused serious harm to social development ([1] M.You, J.Zhong, Y.Hong, Z.Duan, M.Lin, F.Xu, Nanoscale 2015, 7, 4423-4431 ). Anti-counterfeiting technology is widely used in the production of anti-counterfeiting marks and anti-counterfeiting printing and packaging. Among them, the optical anti-counterfeiting technology using fluorescent anti-counterfeiting ink has become a national banknote, securities, The preferred anti-counterfeiting technology for trademarks. Optical anti-counterfeiting ink is an ink-jet advanced functional material that disperses anti-counterfeiting materials with special properties in ink binders and prepares them throu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/50C09D11/38C09D11/32G09F3/00
CPCC09D11/32C09D11/38C09D11/50G09F3/0291
Inventor 庄逸熙林存键解荣军周天亮
Owner XIAMEN UNIV
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