An adjustable dual-mode composite fluorescent material and its preparation method and anti-counterfeiting application

A technology of composite fluorescent and fluorescent inks, applied in the direction of luminescent materials, applications, chemical instruments and methods, etc., can solve the problems of fast obsolescence and easy replication, and achieve the effects of long linear emission, long life, and flexible coordination mode

Active Publication Date: 2021-08-13
HENAN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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However, since traditional fluorescent materials are quickly outdated and easily replicated, there is an urgent need to develop high-security anti-counterfeiting materials that combine multiple anti-counterfeiting functions to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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  • An adjustable dual-mode composite fluorescent material and its preparation method and anti-counterfeiting application
  • An adjustable dual-mode composite fluorescent material and its preparation method and anti-counterfeiting application
  • An adjustable dual-mode composite fluorescent material and its preparation method and anti-counterfeiting application

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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 its preparation method and anti-counterfeiting application. Firstly, through Cd 2+ The ion is coordinated with the tetracarboxylic acid ligand to prepare a chemical formula {[Cd 4 (L) 2 (H 2 O) 3 ]·4.5H 2 O} n The metal organic framework material of the three-dimensional structure; The preparation method comprises: take cadmium source, tetracarboxylic acid ligand, polyvinylpyrrolidone, dissolve in N, N dimethyl formamide and water mixed solution, place 80 ℃ environment Under heating and reflux for 3 days, colorless crystals were obtained, which were collected and dried to obtain the metal organic framework material with the three-dimensional structure. On this basis, the present invention further prepares an adjustable dual-mode composite fluorescent material, uses the mixture of the composite fluorescent material solution as an anti-counterfeiting ink, writes and draws some signals and pictures on paper, and the photoluminescence conversion can be repeatedly realized, showing its Versatility and great potential to increase the level of security against counterfeiting.

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 Patents(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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