Preparation method and application of rare earth doped NaYF4/carbon quantum dot dual-mode fluorescent nanocomposite

A carbon quantum dot and rare earth doping technology is applied in the field of preparation of rare earth doped NaYF4/carbon quantum dot dual-mode fluorescent nanocomposite materials, which can solve the problem of uncontrollable carbon quantum dot spacing, large composite material size, and easy aggregation and quenching. to avoid aggregation quenching, narrow size distribution, and good water dispersibility

Inactive Publication Date: 2019-01-11
HUNAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, rare earth doped NaYF is prepared by hydrothermal method 4 Composite fluorescent material with carbon quantum dots combines two fluorescent materials with excellent performance, but there are problems such as no strong interaction between the up-conversion material and carbon quantum dots, and carbon dots are easy to fall off; and the distance between carbon quantum dots cannot be controlled , prone to aggregation quenching
In addition, the size of the composite material prepared by this method is large, which is very easy to cause nozzle clogging when used in inkjet printing

Method used

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  • Preparation method and application of rare earth doped NaYF4/carbon quantum dot dual-mode fluorescent nanocomposite
  • Preparation method and application of rare earth doped NaYF4/carbon quantum dot dual-mode fluorescent nanocomposite
  • Preparation method and application of rare earth doped NaYF4/carbon quantum dot dual-mode fluorescent nanocomposite

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Embodiment 1

[0043] This embodiment provides a rare earth doped NaYF 4 A method for preparing a carbon quantum dot dual-mode fluorescent nanocomposite material, specifically comprising the following steps:

[0044] S1. Preparation of rare earth metal oleate precursor: weigh 2 mmol of rare earth metal salt (specifically: 0.4732 g (1.56 mmol) YCl 3 ·6H 2 O, 0.1549 g (0.4 mmol) YbCl 3 ·6H 2 O, 0.0158 g (0.04 mmol) ErCl 3 ·6H 2 O), 1.8570 g (6.1 mmol) of sodium oleate was placed in a 100 mL round-bottomed flask, 6 mL of water, 7 mL of ethanol and 14 mL of n-hexane were added, stirred magnetically, refluxed at 70 °C for 4 h, stopped heating and cooled to room temperature Finally, pour the obtained mixed solution into a separatory funnel, wash with water three times, and set aside;

[0045] S2. Preparation of Rare Earth Doped NaYF 4 Upconversion nanoparticles: put the rare earth metal oleate precursor prepared in the previous step into a 100 mL three-neck flask, add 30 mL octadecene and 1...

Embodiment 2

[0058] This embodiment provides a rare earth doped NaYF 4 A method for preparing a carbon quantum dot dual-mode fluorescent nanocomposite material, specifically comprising the following steps:

[0059] S1. Preparation of rare earth metal oleate precursor: weigh 2 mmol of rare earth metal salt (specifically: 0.4532 g (1.494 mmol) YCl 3 ·6H 2 O, 0.1937 g (0.50 mmol) YbCl 3 ·6H 2 O, 0.0023 g (0.006 mmol) TmCl 3 ·6H 2 O), 1.8570 g (6.1 mmol) of sodium oleate was placed in a 100 mL round-bottomed flask, 6 mL of water, 7 mL of ethanol and 14 mL of n-hexane were added, stirred magnetically, refluxed at 70 °C for 4 h, stopped heating and cooled to room temperature Finally, pour the obtained mixed solution into a separatory funnel, wash with water three times, and set aside;

[0060] S2. Preparation of Rare Earth Doped NaYF 4 Upconversion nanoparticles: put the rare earth metal oleate precursor prepared in the previous step into a 100 mL three-neck flask, add 30 mL octadecene an...

Embodiment 3

[0066] This embodiment refers to the preparation method of Example 1, the difference is that in step S1, the 2 mmol rare earth metal salt weighed is specifically 0.5339 g (1.76 mmol) YCl 3 ·6H 2 O, 0.0763 g (0.20 mmol) ErCl 3 ·6H 2 O, 0.0154 g (0.04 mmol) TmCl 3 ·6H 2 O; the carbon quantum dot solution added in step S4 is 8 mL of carbon quantum dot aqueous solution with a concentration of 0.6 g / mL.

[0067] For the rare earth doped NaYF prepared in this embodiment 4 / Carbon quantum dot dual-mode fluorescent nanocomposite material carries out fluorescence spectrum observation and finds that the rare earth doped NaYF provided by this embodiment 4 / Carbon quantum dot dual-mode fluorescent nanocomposite emits red light under 980 nm laser irradiation and blue light under 360 nm ultraviolet light irradiation.

[0068] The rare earth doped NaYF prepared in this embodiment 4 / carbon quantum dot dual-mode fluorescent nanocomposite material is applied to inkjet printing, the spec...

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Abstract

The invention relates to a preparation method and application of a rare earth doped NaYF4 / carbon quantum dot dual-mode fluorescent nanocomposite in the technical field of nanocomposites. The preparation method comprises the steps of mixing an aqueous dispersion solution of a rare earth doped NaYF4 up-conversion nanoparticle modified by a cationic surfactant with a carbon quantum dot solution; then, adding an alkaline solution, ethyl acetate and ethyl orthosilicate into the mixed solution; coating the surface of the rare earth doped NaYF4 particle with a silicon dioxide shell by utilizing a sol-gel chemical principle; and meanwhile, packaging the carbon quantum dot into the shell to prepare the core-shell nanocomposite. By using the preparation method, the aggregation quenching of the carbon quantum dot is effectively avoided, and the optical and chemical stability of the prepared composite is good. The obtained composite is prepared into ink, the prepared composite is applied to the anti-fake field by ink jet printing, and the composite has the characteristics of high concealing property and copying difficulty caused by dual-mode detection and is better in anti-fake effect.

Description

technical field [0001] The invention relates to the technical field of nanocomposite materials, more specifically, to a rare earth-doped NaYF 4 Preparation method and application of carbon quantum dot dual-mode fluorescent nanocomposite material. Background technique [0002] Fluorescent anti-counterfeiting technology is an important means to resist counterfeiting and shoddy. Fluorescent anti-counterfeiting inks based on single rare earth-doped up-conversion fluorescent materials or carbon quantum dot fluorescent materials are difficult to meet higher-level anti-counterfeiting requirements due to the ease of replication of their single fluorescent mode. . Therefore, anti-counterfeiting inks with dual-mode fluorescent materials have appeared, mainly by coating a layer of up-conversion materials excited at 808 nm or coating a layer of rare earth-doped down-conversion fluorescent materials on the surface of up-conversion nanoparticles excited at 980 nm. . Although this homog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C09K11/85C09K11/02C09D11/50B82Y30/00
CPCC09D11/50C09K11/025C09K11/65C09K11/7773B82Y30/00
Inventor 谭海湖张昌凡许建雄谢少文
Owner HUNAN UNIV OF TECH
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