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Chameleon-like rare earth inorganic material, preparation method thereof and application of chameleon-like rare earth inorganic material in fluorescence anti-counterfeiting

A rare earth inorganic and fluorescent technology, applied in the application of fluorescent anti-counterfeiting, the chameleon-like rare earth inorganic material, and its preparation field, can solve the problems of poor anti-counterfeiting effect, limited practical application of materials, complex structure design excitation light power density, etc. The effect of anti-counterfeiting effect

Active Publication Date: 2020-08-04
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, traditional rare-earth inorganic fluorescent anti-counterfeiting materials can only produce a single color of light under the excitation of ultraviolet or near-infrared light, which is easy to be imitated, so the anti-counterfeiting effect is poor
At present, the way to achieve multi-color light-emitting display is usually achieved by combining materials that emit different colors of light. However, the anti-counterfeiting effect is still not ideal. Therefore, it is particularly important to develop multi-dimensional single rare earth fluorescent anti-counterfeiting materials.
It has been reported that the up-conversion color change of a single material can be achieved by changing the excitation light power density, but it usually requires complex structural design and high excitation light power density (Angew.Chem.Int.Ed.2015,54,1–6 ; J.Phys.Chem.Lett.2016,7,4916-4921), which limit the practical application of these materials
In addition, due to the abundance of rare earth ion energy levels, rare earth fluorescent materials usually exhibit multi-band emission, which is not conducive to improving the anti-counterfeiting ability of rare earth fluorescent materials

Method used

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  • Chameleon-like rare earth inorganic material, preparation method thereof and application of chameleon-like rare earth inorganic material in fluorescence anti-counterfeiting
  • Chameleon-like rare earth inorganic material, preparation method thereof and application of chameleon-like rare earth inorganic material in fluorescence anti-counterfeiting
  • Chameleon-like rare earth inorganic material, preparation method thereof and application of chameleon-like rare earth inorganic material in fluorescence anti-counterfeiting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Example 1NaYbF 4 : Preparation of 2% Er

[0060] Weigh 0.98mmol Yb(CH 3 COO) 3 ,0.02mmol Er(CH 3 COO) 3 . Add 8 mL of oleic acid and 12 mL of octadecene mixed solution, mix well, heat up to dissolve under nitrogen atmosphere, and cool down to room temperature. The temperature was raised to 160° C. under a nitrogen atmosphere, kept for 0.5 h, and then lowered to room temperature. Add 2mmol NaHF 2 , heated up to 320° C. under a nitrogen atmosphere, kept for 1 h, and then naturally cooled to room temperature. Add ethanol for precipitation and centrifugation, and then wash with cyclohexane and alcohol to obtain NaYbF 4 : 2% Er particles.

[0061] figure 1 NaYbF 4 : Powder diffraction XRD figure (a) and scanning electron microscope figure (b) of 2% Er nanocrystal, as can be known from the figure: prepared NaYbF 4 : 2% Er nanocrystals are hexagonal phase materials, and the scanning electron microscope shows that the prepared NaYbF 4 : 2% Er nanocrystals are in th...

Embodiment 2

[0064] Example 2 Core-shell NaYbF 4 :2%Er@NaYF 4 preparation of

[0065] Weigh 0.5mmol NaYbF at room temperature 4 : 2% Er core nanocrystals and 1mmol Y(CH 3 COO) 3 , add 8 mL of oleic acid and 12 mL of octadecene mixed solution, mix evenly, heat up to dissolve under nitrogen atmosphere, and cool down to room temperature. The temperature was raised to 160° C. under a nitrogen atmosphere, kept for 0.5 h, and then lowered to room temperature. Add 2mmolNaHF 2 , heated up to 320° C. under a nitrogen atmosphere, kept for 1 h, and then naturally cooled to room temperature. Add ethanol for precipitation and centrifugation, and then wash with cyclohexane and alcohol to obtain NaYbF 4 :2%Er@NaYF 4 Nanocrystalline.

[0066] image 3 NaYbF 4 :2%Er@NaYF 4 Powder diffraction XRD pattern (a), scanning electron microscope pattern (b) and element distribution pattern (c) of nanocrystals. It can be seen from the figure that the prepared NaYbF 4 :2%Er@NaYF 4 The nanocrystalline ma...

Embodiment 3

[0069] Example 3 Preparation of a color-changing multi-dimensional anti-counterfeiting label

[0070] The NaYbF prepared by embodiment 2 4 :2%Er@NaYF 4 The material is directly coated on the paper product, and then dried naturally to obtain a color-changing multi-dimensional anti-counterfeiting label ( Figure 5 ). Under 980nm excitation, the label will exhibit sensitive excitation light power-dependent multicolor upconversion luminescence. With the increase of excitation power, the upconversion luminescence of the label can be continuously regulated from green to yellow to red. In addition, the label also exhibits a down-transferred single-band emission dependent on the wavelength of the excitation light; a single-band red emission under excitation at 377nm; and a single-band green emission under excitation at 490nm. The up-converted color change dependent on the excitation light power of the modified label and the down-transferred single-band emission dependent on the exc...

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Abstract

The invention discloses a rare earth inorganic material as well as a preparation method and application thereof. The rare earth inorganic material is represented by a chemical formula XAF4: y% B or XAF4: y% B@XMF4, wherein X is selected from at least one of Li, Na and K, A represents sensitizing ions and is selected from Yb and / or Nd, B represents emission ions and is selected from at least one ofEr, Ho and Tm, M is selected from at least one of rare earth elements Gd, Y and Tb, and y represents the molar doping amount of B in the rare earth inorganic material and ranges from 0.01% to 40%. The material shows sensitive excitation light power dependent up-conversion luminescence and excitation light wavelength dependent down-transfer single-band emission characteristics, and the applicationof the material in multi-dimensional fluorescence anti-counterfeiting can be realized by utilizing the characteristics.

Description

technical field [0001] The invention belongs to the field of rare earth material synthesis technology and its anti-counterfeiting application, and in particular relates to a chameleon-like rare earth inorganic material, its preparation method and its application in fluorescent anti-counterfeiting. Background technique [0002] Fake banknotes, certificates, works of art, etc. often appear in our daily life, which brings direct property losses to consumers, and also has a direct negative impact on the reputation and image of production companies. In order to prevent products from being imitated, various anti-counterfeiting technologies such as barcodes, two-dimensional codes, watermarks, and fluorescent anti-counterfeiting technologies have flourished. Compared with other anti-counterfeiting technologies such as two-dimensional codes and barcodes, fluorescent materials used in fluorescent anti-counterfeiting technology can be invisible attached to the surface of banknotes, cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78G06Q30/00G09F3/02
CPCC09K11/7773G06Q30/0185G09F3/0294
Inventor 陈学元游文武涂大涛郑伟
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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