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A kind of multi-level anti-counterfeiting material with three-primary-color orthogonal up-conversion fluorescence characteristics and its application

A technology with fluorescent characteristics and three primary colors, applied in luminescent materials, identification devices, instruments, etc., can solve the problems of limited anti-counterfeiting and information security applications, poor anti-counterfeiting technology, easy to be counterfeited, etc., to achieve excellent stability and avoid fluorescence stability. Poor, avoid mutual interference effect

Active Publication Date: 2021-08-17
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, anti-counterfeiting materials based on down-conversion luminescence can easily be replaced by other materials with similar emission characteristics, resulting in poor anti-counterfeiting technology and extremely easy to be forged
In addition, these fluorescent materials usually have inherent shortcomings such as photobleaching, background fluorescence interference caused by ultraviolet light excitation, excitation / emission spectral overlap, and emission dependence on the wavelength of excitation light, which greatly limits their applications in anti-counterfeiting and information security.

Method used

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  • A kind of multi-level anti-counterfeiting material with three-primary-color orthogonal up-conversion fluorescence characteristics and its application
  • A kind of multi-level anti-counterfeiting material with three-primary-color orthogonal up-conversion fluorescence characteristics and its application
  • A kind of multi-level anti-counterfeiting material with three-primary-color orthogonal up-conversion fluorescence characteristics and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The anti-counterfeiting material involved in the present invention is composed of five-shell core-shell structure nanoparticles with red, green and blue three primary colors orthogonally emitting light and disappearable ink. Among them, the five-shell core-shell nanoparticles are composed of NaYF 4 The host matrix is ​​doped with a specific concentration (Er 3+ 、Nd 3+ and Yb 3+ ) and activators (Ho 3+ 、Er 3+ and Tm 3+ )constitute. From the inside to the outside are nuclear NaYF 4 :Yb / Tm, the first inert isolation layer NaYF 4 (first shell), red light emitting layer NaYF 4 : Er / Ho (second shell), second inert barrier layer NaYF 4 (third shell), green light emitting layer NaYF 4 : Nd / Yb / Er (fourth shell), energy absorbing layer NaYF 4 : Nd (fifth shell) composition. Among them, NaYF 4 : The role of the Yb / Tm core is to respond to blue light emission under the excitation of 980nm near-infrared light; the first inert isolation layer NaYF 4 (The first shell lay...

Embodiment 2

[0030] Example 2: Preparation of orthogonal luminescent nanoparticles with red, green and blue primary colors.

[0031] Nanoparticles with red, green and blue three primary colors orthogonal luminescent properties are made of NaYF 4 The main matrix is ​​doped with a specific concentration of sensitizer and activator to form a five-shell core-shell nanostructure material. The specific preparation steps are as follows:

[0032] (1)NaYF 4 : Synthesis of Yb / Tm (30 / 0.5mol%) central core nanoparticles. Rare earth acetate salt Y(CH 3 COO) 3 (69.5%), Yb(CH 3 COO) 3 (30%) and Tm(CH 3 COO) 3 (0.5%) as raw materials, oleic acid (OA) and 1-octadecene (ODE) as high-temperature solvents, heated to 150°C for 60 minutes under the protection of inert gas to obtain rare earth oleic acid complexes Y, Yb, Tm-OA. After cooling to room temperature, add a certain amount of fluorine source NH 4 The methanol solution of F (1.6mmoL) and sodium source NaOH (1.0mmoL) was continuously stirred fo...

Embodiment 3

[0036] Example 3: Preparation of trichromatic orthogonal luminescent nanoparticles without oleic acid ligand modification.

[0037] It is obtained by protonating the surface oleic acid ligands with hydrochloric acid. The specific process is: disperse the prepared trichromatic orthogonal luminescent nanoparticles in ethanol solution, then add 1ml of hydrochloric acid (2M) solution and sonicate, then centrifuge at 16000r / min for 20 minutes, and finally collect the The nanoparticles are repeatedly washed three times with absolute ethanol and deionized water to obtain trichromatic orthogonal luminescent nanoparticles without surface ligand modification.

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Abstract

The invention relates to a multi-level anti-counterfeiting material with three-primary-color orthogonal up-conversion fluorescence characteristics and an application thereof, belonging to the technical field of fluorescent anti-counterfeiting materials. The anti-counterfeiting material of the present invention is composed of five-shell core-shell structure nanoparticles with trichromatic orthogonal up-conversion luminescence and disappearable ink; the five-shell core-shell structure nanoparticles are composed of NaYF 4 The host matrix is ​​composed of doped sensitizer and activator. The anti-counterfeiting material can not only generate mutually independent three primary color up-conversion luminescence under the excitation of three different wavelengths of near-infrared light, but also has the characteristic of pH stimulation response under natural light. The anti-counterfeiting material provided by the invention not only expands the application scope of the orthogonal luminescence nanomaterial, but also solves some problems of traditional anti-counterfeiting materials such as single anti-counterfeiting technology, low security and easy copying, and increases the level of security and anti-counterfeiting. The invention can be used for multi-level anti-counterfeiting of confidential information.

Description

technical field [0001] The invention belongs to the technical field of fluorescent anti-counterfeiting materials, and in particular relates to a multi-level anti-counterfeiting material with three-primary-color orthogonal up-conversion fluorescence characteristics and its application. Background technique [0002] Nowadays, fluorescent anti-counterfeiting technology has been widely used in currency, bills, confidential documents, trademarks and medicines. In the past few decades, a large number of fluorescent materials have been used as anti-counterfeiting inks in the fields of information encoding, information encryption and security anti-counterfeiting, such as organic dyes, inorganic semiconductor quantum dots, polymer quantum dots, and perovskite nanocrystals. These fluorescent materials are usually based on down-conversion luminescence, that is, Stokes luminescence with an emission wavelength longer than the excitation wavelength. However, anti-counterfeiting materials...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09F3/02C09K11/02C09K11/85
CPCC09K11/02C09K11/7773G09F3/0294
Inventor 秦伟平贾恒周敏李大光贾志旭秦冠仕赵丹尹升燕狄卫华
Owner JILIN UNIV
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