Multistage anti-counterfeiting material with three-primary-color orthogonal up-conversion fluorescence characteristic and application of multistage anti-counterfeiting material
A technology with fluorescent characteristics and three primary colors, applied in luminescent materials, identification devices, instruments, etc., can solve the problems of easy forgery, poor anti-counterfeiting technology, limited anti-counterfeiting and information security applications, etc., to prevent copying, improve security, and excellent The effect of stability
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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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