Up-conversion luminescence silicon dioxide aerogel and preparation method thereof

A technology of silica and aerogel, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of difficult PDMS uniform compounding, opacity, large size, etc., achieve uniform light transmission and display performance, safe, reliable and easy to use Effect

Active Publication Date: 2020-04-17
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the display and anti-counterfeiting materials, NaYF 4 in the form of nanoparticles, NaYF 4 Microtubes and / or microrods are difficult to uniformly composite with PDMS due to their large size, NaYF 4 Microtubes and / or microrods can deposit or locally build up in PDMS, making them locally opaque

Method used

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  • Up-conversion luminescence silicon dioxide aerogel and preparation method thereof
  • Up-conversion luminescence silicon dioxide aerogel and preparation method thereof
  • Up-conversion luminescence silicon dioxide aerogel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0061] The embodiment of the present invention carries out the preparation of up-conversion luminescent silica airgel, including the following steps:

[0062] (1) Add deionized water (5mL), NaOH aqueous solution (0.42mL, 5M), sodium citrate (0.3mL, 0.4M), yttrium acetate (1.56mL, 0.2M) into 20mL polytetrafluoroethylene liner in sequence , ytterbium acetate (0.4mL, 0.2M) and erbium acetate (0.04mL, 0.2M) and stirred at room temperature for 15min to obtain the first reaction solution;

[0063] (2) Add ammonium fluoride aqueous solution (3.2mL, 2M) and hydrochloric acid solution (4mL, 1M) to the above-mentioned first reaction solution, continue to stir for 60min to obtain the second reaction solution, and then put the tetrafluoroethylene liner into the high-pressure reaction In the still, put it into an oven at 200° C. for heating reaction (crystal growth) for 20 hours to obtain the crystal material NaYF4:Yb / Er (20 / 2%).

[0064] (3) After the heating reaction, cool the reaction ...

Embodiment 2

[0068] In this example, the preparation of upconversion luminescent silica airgel is carried out, and the steps are the same as in Example 1, the difference is that:

[0069] In step (1), the amount of sodium citrate is 0.5mL, that is, the molar ratio of sodium citrate to NaOH is 0.2:2.1, and the obtained crystal material sample is marked as Sample 2;

[0070] In step (5), the crystal material added is Sample 2, and up-conversion luminescent silica airgel 2 is obtained.

Embodiment 3

[0072] In this example, the preparation of upconversion luminescent silica airgel is carried out, and the steps are the same as in Example 1, the difference is that:

[0073] In step (1), the dosage of sodium citrate is 0.7 mL, that is, the molar ratio of sodium citrate to NaOH is 0.28:2.1, and the obtained crystal material sample is marked as Sample 3.

[0074] In step (5), the crystal material added is Sample 3, and up-conversion luminescent silica airgel 3 is obtained.

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Abstract

The invention belongs to the technical field of up-conversion luminescence anti-counterfeiting materials, and particularly relates to an up-conversion luminescence silicon dioxide aerogel and a preparation method thereof. The up-conversion luminescence silicon dioxide aerogel is formed by compounding a rare earth doped up-conversion luminescence material and a silicon dioxide aerogel; and the rareearth doped up-conversion luminescence material is a NaYF4:Yb / Er micro-tube and / or a NaYF4:Yb / Er micro-rod. The nano-porous material silicon dioxide aerogel is used as a display matrix material, thesilicon dioxide aerogel is transparent, the existence form of NaYF4:Yb / Er is micro-tube and / or micro-rod, and the NaYF4:Yb / Er is uniformly compounded with the silicon dioxide aerogel. The up-conversion luminescence silicon dioxide aerogel has good up-conversion luminescence performance under 980 nm laser irradiation, emits macroscopic green light, has an optical waveguide effect, and can be used in the field of up-conversion luminescence anti-counterfeiting excited by near-infrared laser.

Description

technical field [0001] The invention belongs to the technical field of up-conversion luminescent anti-counterfeiting materials, and in particular relates to an up-conversion luminescent silica airgel and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, counterfeit products emerge in endlessly, which are difficult to identify and cause great economic losses to people's lives. Anti-counterfeiting work is particularly important. Rare earth ion-doped upconversion luminescent materials are a promising and widely used new type of fluorescent materials, which can convert low-energy, invisible near-infrared excitation light into high-energy, visible short-wave emission. One-dimensional up-conversion microrods and microtubes are in the air medium, and the upconversion luminescence can propagate along the axial direction of the microrods / tubes, which has the optical waveguide effect. NaYF 4 The matrix system upconversi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85C09K11/02
CPCC09K11/7773C09K11/025
Inventor 温红丽李翠婷谢胜杰苏少珊郝志峰
Owner GUANGDONG UNIV OF TECH
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