Dual-mode fluorescent anti-counterfeiting material and preparation method thereof

A fluorescent nanomaterial and dual-mode technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of simple fluorescent anti-counterfeiting mode, single detection light source, cumbersome preparation steps, etc., to meet technical requirements, good repeatability, and preparation The effect of simple process

Active Publication Date: 2020-04-10
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a rare-earth-doped fluoride core-shell structure nanomaterial with both up-conversion and down-conversion luminescence modes and its preparation process, which solves the problem of single light source and preparation steps for detection of existing fluorescent anti-counterfeiting materials. The problem of cumbersome and simple fluorescent anti-counterfeiting mode

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  • Dual-mode fluorescent anti-counterfeiting material and preparation method thereof
  • Dual-mode fluorescent anti-counterfeiting material and preparation method thereof
  • Dual-mode fluorescent anti-counterfeiting material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0024] A dual-mode fluorescent material, the molecular formula is NaGdF4:20Yb / 2Ho / 8Ce@NaYF4:5Eu, the preparation method is as follows:

[0025] (1) Preparation of NaGdF4:20Yb / 2Ho / 8Ce nanocrystals. Weigh 0.56 mmol of gadolinium chloride, 0.16 mmol of ytterbium chloride, 0.016 mmol of holmium chloride and 0.064 mmol of cerium chloride into a three-necked flask, then add 8 ml of oleic acid and 12 ml of 1- Octadecene was stirred evenly under the action of a magnetic stirring bar. After feeding nitrogen gas, the mixed solution was rapidly heated to 150° C. and kept at this temperature for 1 hour to obtain an anhydrous yellow transparent solution. After the solution was naturally cooled to room temperature, 10 ml of methanol solution dissolved with 3 mmol of ammonium fluoride and 2 mmol of sodium hydroxide was gradually added dropwise, stirred evenly, and then heated to 80°C for 1 hour. Then the mixed solution was heated up to 110°C and kept for 30 minutes so that the formaldehyde...

Embodiment 2

[0029] A dual-mode fluorescent material, the molecular formula is NaGdF4:20Yb / 2Ho / 8Ce@NaYF4:5Tb, the preparation method is as follows:

[0030] (1) Preparation of NaGdF4:20Yb / 2Ho / 8Ce nanocrystals. Weigh 0.56 mmol of gadolinium chloride, 0.16 mmol of ytterbium chloride, 0.016 mmol of holmium chloride and 0.064 mmol of cerium chloride into a three-necked flask, then add 8 ml of oleic acid and 12 ml of 1- Octadecene was stirred evenly under the action of a magnetic stirring bar. After feeding nitrogen gas, the mixed solution was rapidly heated to 150° C. and kept at this temperature for 1 hour to obtain an anhydrous yellow transparent solution. After the solution was naturally cooled to room temperature, 10 ml of methanol solution dissolved with 3 mmol of ammonium fluoride and 2 mmol of sodium hydroxide was gradually added dropwise, stirred evenly, and then heated to 80°C for 1 hour. Then the mixed solution was heated up to 110°C and kept for 30 minutes so that the formaldehyde...

Embodiment 3

[0033] A dual-mode fluorescent material, the molecular formula is NaGdF4:20Yb / 2Ho / 16Ce@NaYF4:5Eu, the preparation method is as follows:

[0034] (1) Preparation of NaGdF4:20Yb / 2Ho / 16Ce nanocrystals. Weigh 0.496 mmol of gadolinium chloride, 0.16 mmol of ytterbium chloride, 0.016 mmol of holmium chloride and 0.128 mmol of cerium chloride into a three-necked flask, then add 8 ml of oleic acid and 12 ml of 1- Octadecene was stirred evenly under the action of a magnetic stirring bar. After feeding nitrogen gas, the mixed solution was rapidly heated to 150° C. and kept at this temperature for 1 hour to obtain an anhydrous yellow transparent solution. After the solution was naturally cooled to room temperature, 10 ml of methanol solution dissolved with 3 mmol of ammonium fluoride and 2 mmol of sodium hydroxide was gradually added dropwise, stirred evenly, and then heated to 80°C for 1 hour. Then the mixed solution was heated up to 110°C and kept for 30 minutes so that the formaldeh...

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Abstract

The invention relates to the technical field of light emitting and displaying and discloses a dual-mode fluorescent anti-counterfeiting material and a preparation method thereof. The chemical composition of the dual-mode fluorescent anti-counterfeiting material is NaGdF4: Yb/Ho/Ce@NaYF4: X (wherein X is Eu, Tb, Sm or Dy), and the dual-mode fluorescent anti-counterfeiting material emits multi-colorlight with adjustable performance under the excitation of 980-nm near-infrared light and 254-nm ultraviolet light. According to the dual-mode fluorescent anti-counterfeiting material and the preparation method thereof in the invention, prepared rare earth-doped heterogeneous fluoride core-shell nanoparticles realize the dual-mode luminescence characteristic of efficient multi-color regulation andcontrol for the first time; i.e., high-efficiency up-conversion luminescence of green light, yellow light, red light and light of other colors can be realized under the excitation of a 980-nm near-infrared lamp, and multi-color down-conversion luminescence of red light, green light, yellow light and the like is realized under the excitation of a 254-nm ultraviolet lamp; the anti-counterfeiting dual-mode rare earth luminescent material is different from traditional single-mode luminescence, meets the technical requirement of fluorescence anti-counterfeiting, and greatly improve anti-counterfeiting safety; and meanwhile, the preparation method for the material provided by the invention is simple and convenient in process, relatively good in repeatability and easy for mass production.

Description

technical field [0001] The invention relates to the technical field of light emission and display, in particular to a dual-mode fluorescent anti-counterfeiting material and a preparation method thereof. Background technique [0002] The phenomenon of counterfeiting and shoddy products has become an increasingly serious global problem, which seriously plagues enterprises, governments and consumers, thus causing immeasurable economic losses to society. In order to protect the legitimate rights and interests of consumers and enterprises, governments and enterprises all over the world have spent huge sums of money to develop various anti-counterfeiting technologies to increase the recognizability and difficulty of replicating genuine products to deal with the endless counterfeiting methods. Among them, watermarking technology, laser holography technology, barcode and RFID technology, etc. are well-known anti-counterfeiting methods, because of the shortcomings of high anti-counte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85
CPCC09K11/7791C09K11/7773
Inventor 丁明烨杨小飞陆依
Owner NANJING FORESTRY UNIV
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