Upconversion photon anti-counterfeiting bar code based on dual-wavelength response and construction method and application thereof

A construction method and bar code technology, which are applied to record carriers, instruments, and computer parts used in machines, can solve the problems of inability to meet large data storage requirements, low anti-counterfeiting technology, and small coding space, so as to improve coding capabilities and Anti-counterfeiting level, flexible adjustment, the effect of high encryption level

Active Publication Date: 2021-08-13
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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  • Upconversion photon anti-counterfeiting bar code based on dual-wavelength response and construction method and application thereof
  • Upconversion photon anti-counterfeiting bar code based on dual-wavelength response and construction method and application thereof
  • Upconversion photon anti-counterfeiting bar code based on dual-wavelength response and construction method and application thereof

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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 bar code based on dual-wavelength response and a construction method and application thereof, and belongs to the up-conversion anti-counterfeiting technical field. According to the present invention, a near-infrared laser dual-wavelength is adopted to jointly excite a rare earth doped up-conversion luminescent material, and the transition process of electrons in rare earth ions is regulated and controlled by changing the excitation power of the near-infrared laser, so that different luminescent colors and luminescent intensities are generated; and the luminescent color and the luminescent intensity information of the rare earth doped up-conversion luminescent material are used as the identification codes for coding. Due to fine and flexible adjustment of excitation power, rich spectral information can be obtained; and by constructing a large amount of obtained spectral information into the corresponding up-conversion sub-bar codes, the up-conversion sub-bar codes are randomly combined to obtain the complete up-conversion photon anti-counterfeiting bar codes, so that the complexity of information can be increased, higher flexibility is brought to advanced anti-counterfeiting, the information storage capacity is large, the encryption level is high, and the coding capacity and the anti-counterfeiting level are greatly improved.

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 Applications(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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