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An anti-counterfeiting material with near-infrared photocharging upconversion-long afterglow orthogonal fluorescent code

A long afterglow material and near-infrared light technology, applied in the field of anti-counterfeiting, can solve the problems of losing afterglow properties and reducing energy transfer efficiency, and achieve the effects of protecting the internal structure and luminous intensity, long afterglow time, and strong luminescence

Active Publication Date: 2020-10-30
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the properties of the matrix are changed, the material will lose its afterglow properties, and after conventional waterproofing treatment, the increased distance between the long afterglow material and the up-conversion material will reduce the energy transfer efficiency

Method used

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  • An anti-counterfeiting material with near-infrared photocharging upconversion-long afterglow orthogonal fluorescent code
  • An anti-counterfeiting material with near-infrared photocharging upconversion-long afterglow orthogonal fluorescent code
  • An anti-counterfeiting material with near-infrared photocharging upconversion-long afterglow orthogonal fluorescent code

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of coding strips:

[0021] (1) Red (YOF: 80%Yb, 2%Er, referred to as RUC), green (NaYF 4 : 18%Yb, 2%Er, referred to as GUC), blue (NaYF 4 : 20%Yb, 1%Tm, referred to as BUC) three-color up-conversion material, respectively with blue (CaAl 2 o 4 :Eu 2+ , Nd 3+ , referred to as BPM), red (Ca 4 Sr) S:Eu 2+ , referred to as RPM), green (SrAl 2 o 4 :Eu 2+ , Dy 3+ , referred to as GPM) three-color long-lasting materials are mixed in a certain mass ratio to obtain a series of near-infrared light-charged, multi-color up-conversion-long-lasting orthogonal fluorescent materials (for example, the following materials 1-4); the prepared mixed materials After grinding and mixing with a mortar, add polydimethylsiloxane (PDMS) at a ratio of 1:1, and mix;

[0022] Material 1: BUC : GPM = 1 : 20

[0023] Material 2: BUC : RUC : BPM : GPM = 1 : 10 : 10 : 10

[0024] Material 3: BUC : OUC : BPM = 1 : 10 : 20

[0025] Material 4: BUC : GUC : GPM : RPM = 1 : 10 : 5 :...

Embodiment 2

[0029] Preparation of anti-counterfeiting marks:

[0030] The above-mentioned PDMS solution containing composite materials is made on plastic, paper, ceramics and other objects by writing, stamping, printing, etc., and the anti-counterfeiting mark can be formed after the PDMS is cured.

Embodiment 3

[0032] Preparation of near-infrared erasable writing board:

[0033] Apply the above-mentioned PDMS solution containing the composite material evenly on paper, steel plate, plastic plate and other materials, and after the PDMS is cured, it can form near-infrared erasable paper or writing board. see Figure 5 As shown, among them, (a) is a near-infrared rewritable writing board made of the near-infrared rechargeable long-lasting material of the present invention. (b) A multi-color near-infrared light writing board with repeated erasing and writing functions.

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Abstract

The invention belongs to the technical field of anti-counterfeit technology, and particularly relates to a near-infrared light charging upconversion-long-afterglow orthogonal fluorescence-coded anti-counterfeit material. The anti-counterfeit material comprises polydimethylsiloxane for encapsulation and a fluorescent composite material with adjustable multiple colors; the fluorescent composite material comprises a red-green-blue lighting rare earth upconversion material and a red-green-blue lighting rare earth long-afterglow material, wherein the rare earth upconversion material can emit red, green and blue upconversion fluorescence under the excitation of near-infrared light at 980nm to realize multicolor codes under a first dimension; the long-afterflow material absorbs the ultraviolet / blue light emitted by the upconversion material excited by near-infrared light at 980nm, and is stored in a trap of the material, and emits red, green and blue lights in an afterflow manner after the excited light source is removed, to realize the multicolor codes on a second dimension. Compared with the traditional one-dimensional codes, the coding mode is novel, the coding number is larger, and the anti-counterfeit material has safer effect in the anti-counterfeit field.

Description

technical field [0001] The invention belongs to the technical field of anti-counterfeiting, and in particular relates to an anti-counterfeiting material with near-infrared light charging upconversion-long afterglow orthogonal fluorescent code. Background technique [0002] In recent years, fluorescent coding has been widely used in multiple biological detection, anti-counterfeiting and data encryption and other fields. Long afterglow materials are a class of materials that can continue to emit light after the excitation light is stopped. In the current research, the main materials used to prepare fluorescent codes are dyes, quantum dots and up-conversion materials. The coding method is mainly based on the color, the ratio of different emission peaks, and the fluorescence lifetime. Due to the single encoding method, the number of encodings that can be obtained is not many. [0003] Long afterglow material is a kind of material that can continue to emit light after the exci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/86C09K11/85C09K11/80C09K11/84
CPCC09K11/7731C09K11/7772C09K11/7792
Inventor 张凡李晓民胡丽丹
Owner FUDAN UNIV