Preparation method of high-intensity ultraviolet emission-based upconversion fluorescent powder containing composite photocatalytic material

A composite photocatalysis and phosphor technology, applied in luminescent materials, catalyst activation/preparation, chemical instruments and methods, etc., can solve the problems of limited application, low utilization rate of visible light and infrared light, low ultraviolet light emission intensity, etc. The effect of improving light intensity, excellent photocatalytic activity, and simple process

Active Publication Date: 2018-11-02
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the current studies are limited to 20%Yb 3+ / RE 3+ Co-doped up-conversion luminescent material with TiO 2 Composite, but 20%Yb 3+ / RE 3+ The ultraviolet light emission intensity of co-doped upconversion luminescent materials is generally low, although visible light or infrared light can be converted into ultraviolet light to excite TiO 2 , but TiO 2 The utilization of visible light and infrared light is still low, which largely limits the TiO 2 Applications in Photocatalysis

Method used

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  • Preparation method of high-intensity ultraviolet emission-based upconversion fluorescent powder containing composite photocatalytic material
  • Preparation method of high-intensity ultraviolet emission-based upconversion fluorescent powder containing composite photocatalytic material
  • Preparation method of high-intensity ultraviolet emission-based upconversion fluorescent powder containing composite photocatalytic material

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Embodiment 1

[0026] A Yb with high intensity ultraviolet emission 3+ / Tm 3+ Co-doped LiYF 4 The preparation method of composite photocatalytic material, to prepare Yb 3+ / Tm 3+ Co-doped LiYF 4 Composite TiO 2 For example, the following steps are included:

[0027] 1) Yb 3+ / Tm 3+ Co-doped LiYF 4 Phosphor powder preparation:

[0028] Rare earth oxide Yb 2 o 3 , Y 2 o 3 and Tm 2 o 3 Under the conditions of magnetic stirring and heating, they were evenly dispersed in deionized water, and concentrated nitric acid was added dropwise. After 5 minutes, the rare earth oxides were completely dissolved to obtain a transparent solution; the obtained transparent solution was added dropwise to 20 mL of ethanol according to a certain molar ratio Vigorously stirred in aqueous solution, wherein, Yb 3+ 、Tm 3+ and Y 3+The molar percentages are 70%: 0.2%: 29.8%, and finally add a mixture of 3mmoL lithium hydroxide and 4mmoL ammonium hydrogen fluoride to adjust the pH value to neutral, stir ...

Embodiment 2

[0033] Rare earth oxide Yb 2 o 3 , Y 2 o 3 and Tm 2 o 3 Disperse evenly in deionized water under the condition of magnetic stirring and heating, add concentrated nitric acid dropwise, after 5 minutes, the rare earth oxide is completely dissolved, and a transparent solution is obtained; the obtained transparent solution is added dropwise to 20mL aqueous solution according to a certain molar ratio Vigorously stirred, wherein, Yb 3+ , Tm 3+ and Y 3+ The molar percentages are respectively 30%: 0.2%: 69.8%; other steps are the same as in Example 1.

Embodiment 3

[0035] Rare earth oxide Yb 2 o 3 , Y 2 o 3 and Tm 2 o 3 Disperse evenly in deionized water under the condition of magnetic stirring and heating, add concentrated nitric acid dropwise, after 5 minutes, the rare earth oxide is completely dissolved, and a transparent solution is obtained; the obtained transparent solution is added dropwise to 20mL aqueous solution according to a certain molar ratio Vigorously stirred, wherein, Yb 3+ , Tm 3+ and Y 3+ The molar percentages are respectively 40%: 0.2%: 59.8%; other steps are the same as in Example 1.

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Abstract

The invention discloses a preparation method of a high-intensity ultraviolet emission-based upconversion fluorescent powder containing a composite photocatalytic material. The preparation method comprises the following steps: preparing a high-intensity ultraviolet emission-based upconversion fluorescent powder by taking rare earth oxide as a raw material, and then compounding the prepared fluorescent powder and TiO2 to obtain the TiO2-coated high-intensity ultraviolet emission-based upconversion fluorescent powder containing composite photocatalytic material. According to the high-intensity ultraviolet emission-based upconversion fluorescent powder containing composite photocatalytic material prepared by the preparation method provided by the invention, the upconversion material absorbs near-infrared light and converts the near-infrared light into strong ultraviolet light for emission, and then the TiO2 is excited to generate catalytic activity so as to achieve the utilization of the near-infrared light, so that the response range of photocatalysis to a solar spectrum is broadened; the high-intensity ultraviolet emission-based upconversion fluorescent powder containing composite photocatalytic material is highly dispersed, non-toxic and harmless and meets an environment-friendly requirement. The high-intensity ultraviolet emission-based upconversion fluorescent powder containing the composite photocatalytic material is prepared by a hydrothermal method; a preparation technology thereof is simple and easy to operate; the cost is reduced to a certain extent; the preparation method is particularly suitable for mass production; the high-intensity ultraviolet emission-based upconversion fluorescent powder containing composite photocatalytic material can be applied to the field of photocatalytic environmental control.

Description

technical field [0001] The invention belongs to the technical field of up-conversion luminescent materials and photocatalytic materials, and in particular relates to a preparation method of a high-intensity ultraviolet emission up-conversion fluorescent powder composite photocatalytic material. Background technique [0002] TiO 2 Due to its strong oxidation ability under ultraviolet light, good thermal and chemical stability, biocompatibility, environmental friendliness, low cost, and long service life, it is widely used in the degradation of organic and inorganic pollutants. A very promising photocatalyst material. However, due to TiO 2 The bandgap width is about 3.22eV, and it can only absorb ultraviolet light with a wavelength of less than 387nm, which makes the utilization rate of solar energy less than 5%, resulting in low light conversion efficiency and greatly restricting industrial applications. [0003] An up-conversion luminescent material is a material that can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/135B01J37/10B01J37/03C09K11/85
CPCB01J27/135B01J35/004B01J37/031B01J37/10C09K11/7773
Inventor 黄清明陈艳杰吴继耀俞瀚
Owner FUZHOU UNIV
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