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An anti-counterfeiting barcode based on dual-wavelength response up-conversion photons and its construction method and application

A construction method and barcode technology, which are applied to record carriers, instruments, computing, etc. used by machines, can solve the problems of inability to meet large data storage requirements, small coding space, and low anti-counterfeiting technology, so as to improve coding ability and anti-counterfeiting level. , the effect of high encryption level and flexible adjustment

Active Publication Date: 2022-03-01
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the monotonous luminescent color under a specific excitation wavelength leads to a small coding space for these materials, which cannot meet the storage requirements of large amounts of data, and the anti-counterfeiting technology is low, and it is easy to be imitated

Method used

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  • An anti-counterfeiting barcode based on dual-wavelength response up-conversion photons and its construction method and application
  • An anti-counterfeiting barcode based on dual-wavelength response up-conversion photons and its construction method and application
  • An anti-counterfeiting barcode based on dual-wavelength response up-conversion photons and its construction method and application

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preparation example Construction

[0036] In the present invention, the preparation method of the rare earth-doped up-conversion luminescent material preferably includes the following steps:

[0037] The rare earth oxide, BaCO 3 Grinding and mixing with ZnO, and sintering the resulting mixed material to obtain a rare earth doped up-conversion luminescent material; the rare earth oxide includes Yb 2 o 3 , also includes Er 2 o3 、Pr 2 o 3 、Tm 2 o 3 or Ho 2 o 3 .

[0038] In the present invention, the rare earth oxide, BaCO 3 The molar ratio to ZnO is preferably 4:5:4. In the present invention, the rare earth oxide includes Yb 2 o 3 , also includes Er 2 o 3 、Pr 2 o 3 、Tm 2 o 3 or Ho 2 o 3 ; the Yb 2 o 3 with Er 2 o 3 (Pr 2 o 3 、Tm 2 o 3 or Ho 2 o 3 ) molar ratio to meet the above-mentioned doping concentration range.

[0039] In the present invention, the rare earth oxide, BaCO 3 The process of grinding and mixing with ZnO is preferably carried out in an agate mortar, and the grindin...

Embodiment 1

[0053] Rare earth oxide (Yb 2 o 3 and Er 2 o 3 ), 6mmol BaCO 3 and 4.8 mmol ZnO were ground in an agate mortar for 40 min, and the resulting mixture was placed in an alumina crucible, and sintered in air at 1200 ° C in a muffle furnace for 4 h; after sintering, the muffle furnace was naturally cooled to room temperature, After fully grinding, the rare earth doped up-conversion luminescent material is obtained, wherein the rare earth ion Y 3+ 、Er 3+ and Yb 3+ The total molar percentage is 100mol%, Yb 3+ The ion doping concentration is 1mol%, Er 3+ The ion doping concentration is 3mol%;

[0054] Select 980nm and 1550nm wavelength lasers to jointly excite the rare earth-doped up-conversion luminescent material, wherein the 980nm laser excitation power is fixed at 720mW, the 1550nm laser excitation power is changed, and five groups of 1550nm laser excitation powers are selected, which are 66mW, 145mW, and 225mW respectively , 340mW and 480mW to obtain 5 groups of differen...

Embodiment 2

[0062] Rare earth oxide (Yb 2 o 3 and Er 2 o 3 ), 6mmol BaCO 3 and 4.8 mmol ZnO were ground in an agate mortar for 40 min, and the resulting mixture was placed in an alumina crucible, and sintered in air at 1200 ° C in a muffle furnace for 4 h; after sintering, the muffle furnace was naturally cooled to room temperature, After fully grinding, the rare earth doped up-conversion luminescent material is obtained, wherein the rare earth ion Y 3+ 、Er 3+ and Yb 3+ The total molar percentage is 100mol%, Yb3+ The ion doping concentration is 1mol%, Er 3+ The ion doping concentration is 3mol%;

[0063] Select 980nm and 1550nm wavelength lasers to jointly excite the rare earth-doped up-conversion luminescent material, wherein the 1550nm laser excitation power is fixed at 380mW, the 980nm laser excitation power is changed, and five groups of 980nm laser excitation powers are selected, which are 230mW, 470mW, and 830mW respectively , 1200mW and 1420mW to obtain 5 groups of differen...

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Abstract

The invention provides an up-conversion photon anti-counterfeiting barcode based on dual-wavelength response, a construction method and application thereof, and belongs to the technical field of up-conversion anti-counterfeiting. The present invention adopts dual-wavelength near-infrared laser to jointly excite rare earth-doped up-conversion luminescent materials, and regulates the transition process of electrons in rare-earth ions by changing the excitation power of near-infrared laser to produce different luminous colors and luminous intensities. The luminous color and luminous intensity information of hybrid up-conversion luminescent materials are encoded as identification codes. Due to the fine and flexible adjustment of excitation power, rich spectral information can be obtained, and the corresponding up-conversion sub-barcode can be constructed from the obtained large amount of spectral information. , random combination of up-conversion sub-barcodes to obtain a complete up-conversion photonic anti-counterfeiting barcode, which can increase the complexity of information and bring greater flexibility to advanced anti-counterfeiting, large information storage capacity, high encryption level, greatly improving the coding ability and Security level.

Description

technical field [0001] The invention relates to the field of up-conversion anti-counterfeiting technology, in particular to an up-conversion photon anti-counterfeiting barcode based on dual-wavelength response and its construction method and application. Background technique [0002] Anti-counterfeiting technology has been widely used in currency, bills, confidential documents, trademarks, and medicines. It is very important for business and national public safety, and has become a global and long-term topic. Fluorescence technology is the most ideal candidate technology for practical applications. one. Conventional fluorescent materials are usually based on the down-conversion mechanism, and are widely used in anti-counterfeiting due to their high fluorescence intensity, high stability against degradation, and easy handling, but the disadvantage of easy replication limits their application in the security field. Rare earth-doped up-conversion luminescent materials absorb i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/06
CPCG06K19/06046
Inventor 刘世民英伟涛谷建民许世清范学美
Owner YANSHAN UNIV
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