A niobate reversible photochromic material and preparation method thereof

A technology of photochromic materials and niobate, which is applied in the direction of color-changing fluorescent materials, chemical instruments and methods, etc., can solve the problems such as the limitation of color change diversity, the limitation of practical applications, and the limited types of inorganic photochromic materials. The method is simple and easy, the equipment requirements are low, and the effect of fatigue resistance is good

Active Publication Date: 2020-02-07
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The types of inorganic photochromic materials are very limited, resulting in a limited variety of color changes, which greatly limits its practical application

Method used

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  • A niobate reversible photochromic material and preparation method thereof
  • A niobate reversible photochromic material and preparation method thereof
  • A niobate reversible photochromic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] According to the general formula LiNbO 3 , Weigh Li respectively 2 CO 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 1050°C in an air environment for 5 hours, 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.

[0034] After the niobate reversible photochromic material prepared in Example 1 of the present invention 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. It can be repeated infinitely and has the advantage of good fatigue resistance.

[0035] The LiNbO prepared by the present embodiment 1 was analyzed by a UV-visible spectrophotometer 3 Niobate reversible photochromic ma...

Embodiment 2

[0037] According to the general formula Li 0.995 NbO 3 :0.005Y 3+ , Weigh Li respectively 2 CO 3 , Nb 2 o 5 and Y 2 o 3, the molar ratio is 0.995:1:0.005, fully mixed 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 1050°C for 5h, 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.

[0038] After the reversible photochromic material prepared in Example 2 of the present invention 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. The reversible discoloration process can be unlimited repetitions, has the advantage of good fatigue resistance.

[0039] The niobate reversible photochromic material prepared in Example 2 is...

Embodiment 3

[0041] According to the general formula Li 0.995 NbO 3 :0.005Sm 3+ , Weigh Li respectively 2 CO 3 , Nb 2 o 5 and Sm 2 o 3 , the molar ratio is 0.995:1:0.005, fully mixed 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 1050°C for 5h, 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.

[0042] After the reversible photochromic material prepared in Example 3 of the present invention 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 photochromic process can be infinitely repeated. Repeated, has the advantage of good fatigue resistance.

[0043] The niobate reversible photochromic material prepared in E...

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Abstract

The invention provides a niobate reversible photochromic material. The niobate reversible photochromic material has a general formula as shown in a formula I: Li1-xNbO3:xR; and in the formula I, R isa rare earth element, and x is more than or equal to 0 and less than or equal to 0.03. Compared with the prior art, the niobate reversible photochromic material provided by the invention has the following advantages: the color under the ultraviolet irradiation can slowly change to gray, and the color can restore the original color again after sunlight irradiation; furthermore, the material has high reversible photochromic fatigue resistance and can be widely applied to the fields of optical information storage, light regulation and control, optical devices, inductors, counterfeiting resistance, self-developing holographic recording photograph, radiation meters, protective packaging materials and the like. In addition, the invention provides a preparation method of the niobate reversible photochromic material. According to the method provided by the invention, the preparation raw materials are cheap, the preparation method is simple in process and high in repeatability, and the productis stable in properties.

Description

technical field [0001] The invention relates to a reversible photochromic material, in particular to a niobate reversible photochromic material and a preparation method thereof. Background technique [0002] Photochromism means that after a material is irradiated by a certain electromagnetic wave, its absorption spectrum changes, resulting in discoloration, and after being irradiated again by another wavelength of electromagnetic wave (or heated to a certain temperature) ), and can return to the original color change process. Due to the unique photochromic properties of this type of material, it has attracted great attention from organic, inorganic and material chemistry researchers for many years, and is recognized as a functional material with great application prospects. Photochromic materials can be widely used in military, medical and daily life, such as photochromic camouflage, strong flash protection, radiometers, optical information gene materials, modified gene chi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K9/00
CPCC09K9/00
Inventor 胡义华王传龙金亚洪吕洋
Owner GUANGDONG UNIV OF TECH
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