Niobate reversible photochromic material as well as preparation method and application thereof

A photochromic material, niobate technology, applied in the direction of color-changing fluorescent materials, luminescent materials, chemical instruments and methods, etc., can solve the problems of limited color change diversity, limited practical application, limited types of inorganic photochromic materials, etc. , to achieve the effect of simple and easy preparation process, stable product properties and good fatigue resistance

Active Publication Date: 2017-10-10
GUANGDONG UNIV OF TECH
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Problems solved by technology

The types of inorganic photochromic materials are still very limited, resulting in l

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  • Niobate reversible photochromic material as well as preparation method and application thereof
  • Niobate reversible photochromic material as well as preparation method and application thereof
  • Niobate reversible photochromic material as well as preparation method and application thereof

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Example Embodiment

[0034] The present invention also provides a preparation method based on the above-mentioned niobate reversible photochromic material, which includes the following steps:

[0035] Mixing the Ba-containing compound, the Nb-containing compound, and the Pr-containing compound, and sintering at 800-1200°C for 2-6 hours to obtain the niobate reversible photochromic material;

[0036] The molar ratio of Ba, Nb and Pr in the Ba-containing compound, Nb-containing compound, and Pr-containing compound is (1+x-y): 2:y; x is 0 or 1; 0≤y≤0.03.

[0037] In the present invention, the Ba-containing compound is preferably Ba carbonate, Ba nitrate or Ba oxide, and more preferably Ba carbonate.

[0038] In the present invention, the Nb-containing compound is preferably Nb oxide, Nb carbonate or Nb nitrate, and more preferably Nb oxide.

[0039] In the present invention, the Pr-containing compound is preferably Pr oxide or Pr nitrate, more preferably Pr oxide.

[0040] In the present invention, the sinterin...

Example Embodiment

[0043] Example 1

[0044] According to the expression BaNb 2 O 6 , Weigh BaCO respectively 3 And Nb 2 O 5 , Its molar ratio is 1:1, thoroughly mix and grind to uniformity, put it in a corundum crucible, then put it in a high-temperature tube furnace, keep it in an air environment at 1100℃ for 2h, and finally take out the sample after the furnace is naturally cooled to room temperature Grind to powder again to obtain a white powdery niobate reversible photochromic material.

[0045] After the color change material is excited by 254nm ultraviolet light, its color gradually changes from white to gray, and the color gradually returns to the original white after being irradiated by sunlight. This reversible color process can be repeated indefinitely and has the advantage of good fatigue resistance. . An ultraviolet-visible spectrophotometer was used to measure the BaNb obtained in this example 2 O 6 Niobate reversible photochromic material for analysis, figure 1 This is the diffuse ref...

Example Embodiment

[0046] Example 2

[0047] According to the expression Ba 0.998 Nb 2 O 6 :0.002Pr 3+ , Weigh BaCO respectively 3 , Nb 2 O 5 And Pr 2 O 3 , Its molar ratio is 0.998:1:0.001, fully mixed and ground to uniformity, put it in a corundum crucible, then put it into a high temperature tube furnace, keep it in an air environment at 1100℃ for 2h, and finally cool it down to room temperature with the furnace Take out the sample and grind it to powder again to obtain a white powdery niobate reversible photochromic material.

[0048] After the color change material is excited by 254nm ultraviolet light, its color gradually changes from white to gray, and the color gradually returns to the original white after being irradiated by sunlight. This reversible color process can be repeated indefinitely and has the advantage of good fatigue resistance. . An ultraviolet-visible spectrophotometer was used to measure the Ba obtained in this example 0.998 Nb 2 O 6 :0.002Pr 3+ Niobate reversible photochrom...

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Abstract

The invention provides a niobate reversible photochromic material. The expression formula is Ba1+x-yNb2O6+x:yPr<3+>; x is 0 or 1; y is the molar weight of doped Pr; and y is more than or equal to 0 but less than or equal to 0.03. The color change degree of the inorganic photochromic material provided by the invention is adjusted in the manner of doping rare earth elements. The preparation raw materials of the reversible photochromic material are low in cost; the reducing atmosphere is not required by the preparation; the equipment requirement is low; the preparation process is simple and feasible; the repeatability is high; and the product nature is stable. The color of the niobate reversible photochromic material provided by the invention gradually becomes gray under the irradiation of ultraviolet light, and can recover the original color under the irradiation of sunlight; and the material has the advantage of excellent fatigue resistance and can be widely applied to the fields of optical information storage, light control, optical device materials, inductors, anti-fake products, self-developing holographic recording cameras, decoration, radiation meters, packaging material protection, and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic photochromic functional luminescent materials, and specifically relates to a niobate reversible photochromic material and its preparation method and application. Background technique [0002] Photochromism refers to a material that changes from one color to another under the irradiation of electromagnetic waves of a certain wavelength and intensity, and returns to its original color under the irradiation of another electromagnetic wave of a different frequency (or after heating to a certain temperature). color process. The material has different absorption spectra in these two states resulting in a color change. Due to the unique photochromic performance of this kind of material, it has been paid great attention by organic, inorganic and material chemistry researchers for many years, and is recognized as a functional material with great application prospects. Photochromic materials can be wide...

Claims

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Application Information

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IPC IPC(8): C09K9/00C09K11/67
CPCC09K9/00C09K11/7703
Inventor 胡义华王传龙金亚洪吕洋
Owner GUANGDONG UNIV OF TECH
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