Double mode light-emitting water-based anti-counterfeiting ink, and preparation method and application thereof

A dual-mode, water-based technology, applied in applications, luminescent materials, chemical instruments and methods, etc., can solve the problems of poor anti-counterfeiting effect, easy imitation of anti-counterfeiting ink, and single luminescent color, so as to enhance anti-counterfeiting security and endow Long-term stability, the effect of simple preparation method

Active Publication Date: 2019-12-20
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the existing fluorescent materials used as anti-counterfeiting inks are based on this luminescent mechanism. Under ultraviolet excitation, the luminescent color is single. The inventor found in the research that the anti-counterfeiting inks of this fluorescent material are easy to be imitated in long-term use, and the anti-counterfeiting effect not good

Method used

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  • Double mode light-emitting water-based anti-counterfeiting ink, and preparation method and application thereof
  • Double mode light-emitting water-based anti-counterfeiting ink, and preparation method and application thereof
  • Double mode light-emitting water-based anti-counterfeiting ink, and preparation method and application thereof

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preparation example Construction

[0041] The disclosure provides a preparation method of up-conversion nanoparticles, dissolving lanthanide metal salts in a mixed solution of oleic acid and octadecene, and preparing up-conversion nanoparticles (UCNP) and carbon quantum dots through pyrolysis. It has been confirmed by experiments that the up-conversion nanoparticles have the characteristics of down-conversion fluorescence, which emit blue fluorescence under the excitation of 365nm ultraviolet light, and the emission wavelength changes with the excitation wavelength, that is, as the excitation wavelength increases, the emission The position of the peak is red-shifted. This is due to the fact that carbon quantum dots are produced during the preparation of up-conversion nanoparticles, which have the characteristics of down-conversion fluorescence.

[0042] The third embodiment of the present disclosure provides an application of the above-mentioned dual-mode light-emitting water-based anti-counterfeiting ink in in...

Embodiment 1

[0045] Embodiment 1: Synthesis of NaGdF that emits green light 4 :Yb 3+ ,Er 3+ @NaGdF 4 nanoparticles.

[0046] Take Gd(CH 3 COO) 3 ·H 2 O (0.78mmol, 260.82mg), Yb (CH 3 CO 2 ) 3 4H 2 O (0.20mmol, 84.4mg) and Er (CH 3 CO 2 ) 3 4H 2 O (0.02mmol, 8.33mg) in a 100mL three-neck round bottom flask, add 10mL oleic acid as a stable ligand, 15mL 1-octadecene as a high boiling point solvent, and pass through N at 150°C 2 Stirred in an oil bath for 1 h under the conditions, the solution color turned into light yellow, and Ln 3+ - OA organometallic precursors. Cooled to room temperature, 0.4M 7.0mL NH 4 F methanol solution and 1.0M 3.0mL NaOH methanol solution are quickly mixed in a 15ml centrifuge tube, and quickly injected into the flask with a syringe (it must be injected into the flask quickly at this time, because NH 4 The NaF formed by the reaction of F and NaOH is very easy to stick to the wall of the centrifuge tube), the solution becomes cloudy rapidly, and the ...

Embodiment 2

[0048] Embodiment 2: Synthesis of blue-emitting NaGdF 4 :Yb 3+ ,Tm 3+ nanoparticles.

[0049] Take Gd(CH 3 COO) 3 ·H 2 O(1.494mmol, 499.58mg), Yb(CH 3 CO 2 ) 3 4H 2O (0.50mmol, 211mg) and Tm (CH 3 CO 2 ) 3 4H 2 O (0.006mmol, 2.07mg) in a 100mL three-necked round-bottom flask, add 10mL oleic acid as a stable ligand, 15mL 1-octadecene as a high boiling point solvent, and pass through N at 150°C 2 Stirred in an oil bath for 1 h under the conditions, the solution color turned into light yellow, and Ln 3+ - OA organometallic precursors. Cooled to room temperature, 0.4M 7.0mL NH 4 F methanol solution and 1.0M 3.0mL NaOH methanol solution are quickly mixed in a 15ml centrifuge tube, and quickly injected into the flask with a syringe (it must be injected into the flask quickly at this time, because NH 4 The NaF formed by the reaction of F and NaOH is very easy to stick to the wall of the centrifuge tube), the solution becomes cloudy rapidly, and the solution is passed ...

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Abstract

The invention provides double mode light-emitting water-based anti-counterfeiting ink, and a preparation method and application thereof. The preparation method comprises the steps that an organic solution of up-conversion nanoparticles and carbon quantum dots is added to water-in-oil microemulsion, then an organic solvent of the organic solution in the water-in-oil microemulsion is evaporated by heating, and then water is added to make the water-in-oil microemulsion inversely transform to form water-in-oil nano emulsion. According to the double mode light-emitting water-based anti-counterfeiting ink, and the preparation method and application thereof, the O / W nano emulsion is used for encapsulating artfully an oil-soluble double mode light-emitting material in the inner part of an emulsiondroplet, complex operation brought by removing ligands can be avoided, and the drawback of decreasing fluorescence intensity for removing hydrophobic ligands can be overcome. Compared with oil-soluble anti-counterfeiting ink, the water-based anti-counterfeiting ink has the advantages of no corrosion to a nozzle, no pollution to the environment and no blockage to the nozzle.

Description

technical field [0001] The disclosure relates to the field of fluorescent anti-counterfeiting inks, in particular to a dual-mode luminous water-based anti-counterfeiting ink, a preparation method and an application. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Counterfeit and shoddy goods have gradually become one of the problems that threaten the security of the global economy. Counterfeiting valuable documents, currencies and branded products is a challenging problem that has serious economic and security implications for governments, businesses and consumers all over the world. and health effects. Counterfeit products are estimated to represent a multibillion-dollar underground economy, with large numbers of counterfeit products being produced each year, with major implications for basic research and industrial applications. With the deve...

Claims

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Application Information

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IPC IPC(8): C09D11/50C09D11/38C09K11/85C09K11/02B82Y20/00B82Y40/00
CPCB82Y20/00B82Y40/00C09D11/38C09D11/50C09K11/02C09K11/7773
Inventor 董姝丽武文娜郝京诚
Owner SHANDONG UNIV
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