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Adjustable dual-mode composite fluorescent material and preparation method and anti-counterfeiting application thereof

A technology of compound fluorescence and fluorescent ink, applied in the directions of luminescent materials, applications, chemical instruments and methods, etc., can solve the problems of easy copying and fast outdated, and achieve the effect of improving the level of anti-counterfeiting

Active Publication Date: 2020-11-13
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since traditional fluorescent materials are quickly outdated and easily replicated, there is an urgent need to develop high-security anti-counterfeiting materials that combine multiple anti-counterfeiting functions to combat counterfeiting

Method used

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  • Adjustable dual-mode composite fluorescent material and preparation method and anti-counterfeiting application thereof
  • Adjustable dual-mode composite fluorescent material and preparation method and anti-counterfeiting application thereof
  • Adjustable dual-mode composite fluorescent material and preparation method and anti-counterfeiting application thereof

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Embodiment 1

[0066] (1)Y 2 o 3 :Yb 3+ ,Er 3+ @SiO 2 Synthesis of (Upconversion Nanoparticles, UCNPs): Accurately weigh 2.75mmolY(NO 3 ) 3 ·6H 2 O, 0.15mmolYb(NO 3 ) 3 ·5H 2 O, 0.1mmol Er(NO 3 ) 3 ·5H 2 O, and dissolved in 50ml of distilled water to form a clear solution. To the above solution was added 50 ml of urea solution. After heating in an oil bath at 90°C for 5 hours, the precipitate was collected by centrifugation, washed with distilled water and ethanol, and dried. After Y 2 o 3 :Yb 3+ ,Er 3+ The precursor was calcined at 1000°C for 2 hours, cooled naturally, and Y 2 o 3 :Yb 3+ ,Er 3+ nanospheres. 100mgY 2 o 3 :Yb 3+ ,Er 3+ The nanospheres were ultrasonically dispersed in a mixed solution of 80 ml of ethanol and water (v:v=3:1), and then 1.2 ml of concentrated ammonia water was slowly added to the above solution. After ultrasonication for 20 minutes, slowly add 0.323 ml of ethyl orthosilicate solution, and stir at 60° C. for 17 hours. The product was co...

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Abstract

The invention discloses an adjustable dual-mode composite fluorescent material and a preparation method and anti-counterfeiting application thereof. The preparation method comprises the following steps: firstly, preparing a metal organic framework material with a three-dimensional structure and a chemical formula of {[Cd4 (L) 2 (H2O) 3]. 4.5 H2O} n through coordination of Cd < 2 + > ions and a tetracarboxylic acid ligand; dissolving a cadmium source, a tetracarboxylic acid ligand and polyvinylpyrrolidone in a mixed solution of N, N-dimethylformamide and water, carrying out a heating reflux reaction at 80 DEG C for 3 days to obtain colorless crystals, and collecting and drying the colorless crystals to obtain the metal organic framework material with the three-dimensional structure. On thebasis, the adjustable dual-mode composite fluorescent material is further prepared, a mixture of the composite fluorescent material solution serves as anti-counterfeiting ink, some signals and pictures are written and drawn on paper, photoluminescence conversion can be repeatedly achieved, and the huge potential of multifunctionality and improvement of the anti-counterfeiting level is displayed.

Description

technical field [0001] The invention relates to the technical field of anti-counterfeiting materials, in particular to an adjustable dual-mode composite fluorescent material, a preparation method thereof and an anti-counterfeiting application. Background technique [0002] Counterfeiting is a long-term global problem that not only causes serious harm to consumers, but also poses a huge threat to the economy and security of countries and the world. In recent years, various fluorescent materials, including organic luminescent dyes, semiconductor quantum dots, carbon dots, plasmonic materials, etc., have been widely used as anti-counterfeiting due to their high luminous intensity / efficiency and tunable excitation / emission wavelengths. Material. However, since traditional fluorescent materials are quickly outdated and easy to replicate, it is urgent to develop high-security anti-counterfeiting materials that combine multiple anti-counterfeiting functions to combat counterfeitin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C09K11/06C09K11/78C09D11/50
CPCC08G83/008C09D11/50C09K11/06C09K11/7769C09K2211/182
Inventor 李慧军徐周庆闫玲玲刘宪云毕宁
Owner HENAN POLYTECHNIC UNIV
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