A niobate reversible photochromic material and its preparation method and application

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 practical application, limited variety of color changes, limited types of inorganic photochromic materials, etc. , to achieve the effect of stable product properties, simple and easy preparation process, and good fatigue resistance.

Active Publication Date: 2019-07-19
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The types of inorganic photochromic materials are still very limited, resulting in limited diversity of color changes, which greatly limits their practical applications

Method used

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  • A niobate reversible photochromic material and its preparation method and application
  • A niobate reversible photochromic material and its preparation method and application
  • A niobate reversible photochromic material and its preparation method and application

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preparation example Construction

[0034] The present invention also provides a preparation method based on the niobate reversible photochromic material, comprising 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, more preferably Ba carbonate.

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

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

[0040] In the present invention, the sintering atmospher...

Embodiment 1

[0044] According to the expression BaNb 2 o 6 , respectively weigh BaCO 3 and Nb 2 o 5 , with a molar ratio of 1:1, mixed thoroughly and ground until uniform, then put into a corundum crucible, then put into a high-temperature tube furnace, kept at 1100°C for 2 hours in an air environment, and finally cooled naturally with the furnace to room temperature, and then took out the sample Grind again to powder to obtain a white powdery niobate reversible photochromic material.

[0045] After the color-changing 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 discoloration process can be repeated infinitely, and has the advantage of good fatigue resistance . Adopt ultraviolet-visible spectrophotometer to the BaNb that obtains in the present embodiment 2 o 6 Niobate reversible photochromic materials were analyzed, figure 1 It...

Embodiment 2

[0047] According to the expression Ba 0.998 Nb 2 o 6 :0.002Pr 3+ , respectively weigh BaCO 3 , Nb 2 o 5 and Pr 2 o 3 , the molar ratio of which is 0.998:1:0.001, mixed thoroughly and ground until uniform, then put into a corundum crucible, then put into a high-temperature tube furnace, keep warm in the air environment at 1100°C for 2 hours, and finally cool down to room temperature naturally with the furnace The sample was taken out and ground to powder again to obtain a white powdery niobate reversible photochromic material.

[0048] After the color-changing 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 discoloration process can be repeated infinitely, and has the advantage of good fatigue resistance . Adopt ultraviolet-visible spectrophotometer to the Ba that obtains in the present embodiment 0.998 Nb 2 o 6 :0...

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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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Patent Type & Authority Patents(China)
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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