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Optical anti-forgery ink with red, green and blue long-life luminescent characteristics and preparation method and application thereof

A technology with luminous characteristics and optical anti-counterfeiting, which is applied in the field of optical anti-counterfeiting ink and its preparation, can solve the problems of limited application, achieve high-throughput information encryption, realize the effect of flux information encryption, and low cost

Inactive Publication Date: 2019-01-25
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbon dots are usually coated in a specific matrix (polyvinyl alcohol, polyurethane, zeolite and other materials) ([3] J. Liu, N. Wang, Y. Yu, Y. Yan, H. Zhang, J. Li, J.Yu, Sci.Adv.2017, 3, 1603171) achieve long-life luminescence at room temperature, and the solid state greatly limits the application of materials with long-life luminescence characteristics in advanced optical anti-counterfeiting based on inkjet printing technology
So far, there is no report on the long-life luminescence of carbon dot-based inks covering the entire visible luminescence band.

Method used

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  • Optical anti-forgery ink with red, green and blue long-life luminescent characteristics and preparation method and application thereof
  • Optical anti-forgery ink with red, green and blue long-life luminescent characteristics and preparation method and application thereof
  • Optical anti-forgery ink with red, green and blue long-life luminescent characteristics and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of carbon dot 1 (NCD1)

[0040] Weigh 1 g of folic acid and evenly disperse it in 30 mL of absolute ethanol, and stir for 10 min. The above dispersion liquid was transferred to a 100mL polytetrafluoroethylene-lined stainless steel reaction kettle, the lid of the kettle was tightened, and the reaction temperature was 260°C, and the hydrothermal reaction was carried out for 2 hours. The reactor was naturally cooled to room temperature, and the product was centrifuged at a speed of 11000 r / min for 10 min to filter off the supernatant to obtain a crude product. The crude product was put into a vacuum oven, and dried under vacuum at 80° C. for 6 h. Weigh 50 mg of solid powder and dissolve it in 10 mL of deionized water to obtain a 5 mg / mL carbon dot 1 dispersion.

[0041] Preparation of carbon dot 1 composite powder (NCD1-C)

[0042] Dissolve 6 g of urea in 3 mL of carbon dot 1 dispersion, add 3 mL of deionized water, and sonicate for 10 min to obtain a unifor...

Embodiment 2

[0047] Preparation of carbon dots 2 (NCD2)

[0048] Weigh 0.3 g of folic acid and disperse it in 30 mL of deionized water, and stir for 10 min. The above dispersion liquid was transferred to a 100mL polytetrafluoroethylene-lined stainless steel reaction kettle, the lid of the kettle was tightened, and the reaction temperature was 260°C, and the hydrothermal reaction was carried out for 2 hours. The reactor was naturally cooled to room temperature, and the product was centrifuged at a speed of 11000 r / min for 10 min to filter out the precipitate, and the supernatant was taken. The supernatant was freeze-dried to obtain a solid powder. Weigh 50 mg of solid powder and dissolve it in 10 mL of deionized water to obtain a 5 mg / mL carbon dot 2 dispersion.

[0049] Preparation of carbon dots 2 composite powder (NCD2-C)

[0050] Dissolve 6 g of urea in 3 mL of carbon dot 2 dispersion, add 3 mL of deionized water, and sonicate for 10 min to obtain a uniform reaction mixture. The mix...

Embodiment 3

[0055] Preparation of carbon dots 3 (NCD3)

[0056] Weigh 0.3g of o-phenylenediamine and 300μL of ethylenediamine and evenly disperse in 30mL of absolute ethanol, and stir for 10min. The above dispersion liquid was transferred to a 100mL polytetrafluoroethylene-lined stainless steel reaction kettle, the lid of the kettle was tightened, and the reaction temperature was 180°C for hydrothermal reaction for 12 hours. Let the reactor cool down to room temperature naturally, put the product into a dialysis bag with a molecular weight of 500, and fully dialysis for 48 hours. A dispersion of about 5 mg / mL carbon dot 3 was obtained.

[0057] Preparation of carbon dot 3 composite powder (NCD3-C)

[0058] Dissolve 6 g of urea in 3 mL of carbon dot 3 dispersion, add 3 mL of deionized water, and sonicate for 10 min to obtain a uniform reaction mixture. The mixture was placed in a dry box and reacted at 155°C for 6h. After natural cooling to room temperature, the carbon dots 3 composite...

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Abstract

The invention discloses optical anti-forgery ink with red, green and blue long-life luminescent characteristics and a preparation method and application thereof, and relates to the optical anti-forgery ink. The optical anti-forgery ink is prepared from the following components: 1-2 parts of a high-nitrogen doped carbon dot material, 150-250 parts of urea, 50-100 parts of allophanamide, and 5,000-8,000 parts of an organic solvent. The preparation method comprises the following steps: enabling the high-nitrogen doped carbon dot material to be mixed with water solution of the urea, performing ultrasonic treatment, to obtain reacting mixed liquid, performing a drying reaction, cooling to a room temperature, and dissolving in the organic solvent with a carbon-dot-based composite material of theallophanamide, performing the ultrasonic treatment, to obtain the optical anti-forgery ink with red, green and blue long-life luminescent characteristics. The optical anti-forgery ink is sprayed on paper by using a commercial ink-jet printer, and an anti-fake mark is obtained. Based on a characteristic luminescent spectrum of the ink, long luminescent life and ink spraying, image or character information is formed.

Description

technical field [0001] The invention relates to an optical anti-counterfeiting ink, in particular to an optical anti-counterfeiting ink with red, green and blue long-life luminous properties, a preparation method and an application thereof. Background technique [0002] Due to its good stability, low cost, convenient identification, and good concealment, optical anti-counterfeiting has become the preferred anti-counterfeiting technology for banknotes, securities, and trademarks in various countries ([1] P.Kumar, S.Singh, B.K.Gupta, Nanoscale 2016 , 8, 14297-14340). However, traditional fluorescent anti-counterfeiting inks only have single-color fluorescent encryption performance and are easily interfered by strong background fluorescence, which is very easy to be imitated or copied and difficult to verify. A new type of optical anti-counterfeiting material that has multi-color luminescent properties and effectively filters background fluorescence is considered to be a new g...

Claims

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Application Information

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IPC IPC(8): C09D11/50C09D11/03B41M3/14B41M5/00
CPCB41M3/142B41M5/0023C09D11/03C09D11/50
Inventor 庄逸熙林存键解荣军周天亮
Owner XIAMEN UNIV
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