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Method for coating alumine acid strontium long afterglow luminescent powder surface

A surface coating, luminescent powder technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems such as limiting the use range of long afterglow luminescent materials, water resistance is not well solved, weakening light absorption and emission, etc. Achieve high industrial application value, easy operation, and the effect of solving easy hydrolysis

Inactive Publication Date: 2011-03-16
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a process is too cumbersome and difficult to control
Chinese patent CN200410035728 has studied inorganic and organic compound treatment luminescent materials, coated zirconia and triethanolamine on the surface of aluminate long afterglow materials, which improved the hydrophobicity of luminescent materials, but the problem of water resistance has not been well solved
In the existing reports on the surface coating of long afterglow materials, both inorganic or organic coating layers will weaken the absorption and emission of light at the same time, which greatly limits the application range of long afterglow luminescent materials.

Method used

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  • Method for coating alumine acid strontium long afterglow luminescent powder surface
  • Method for coating alumine acid strontium long afterglow luminescent powder surface
  • Method for coating alumine acid strontium long afterglow luminescent powder surface

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Experimental program
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Effect test

Embodiment 1

[0028] The first step: Add 2g of strontium aluminate long-lasting luminescent powder SrAl 2 o 4 :Eu 2+ , Dy 3+ Disperse in 20g of triethyl phosphate, and keep stirring for 10 hours to form a suspension;

[0029] The second step: move the suspension into a high-pressure reactor with a polytetrafluoroethylene liner, seal it and place it in an oven at 180°C for 12 hours;

[0030] Step 3: Take out the autoclave, cool to room temperature, centrifuge to remove the reaction residue in the autoclave, then wash with absolute ethanol for 3 times, then dry in a vacuum drying oven at 80°C for 8 hours, and finally grind , to obtain the surface-coated strontium aluminate long-lasting luminescent powder.

[0031] Gained transmission electron micrograph (eg figure 2 shown), and the transmission electron micrograph of the particle edge of strontium aluminate long-lasting luminescent powder (sample 1) without surface coating (such as figure 1 Shown) comparison shows that the sample 2 sur...

Embodiment 2

[0034] The first step: Add 2g of strontium aluminate long-lasting luminescent powder SrAl 2 o 4 :Eu 2+ , Dy 3+Disperse in 10g of triethyl phosphate, and keep stirring for 10 hours to form a suspension;

[0035] The second step: move the suspension into a high-pressure reactor with a polytetrafluoroethylene liner, seal it and place it in an oven at 200°C for 24 hours;

[0036] Step 3: Take out the autoclave, cool to room temperature, centrifuge to remove the reaction residue in the autoclave, then wash with absolute ethanol for 3 times, then dry in a vacuum drying oven at 80°C for 8 hours, and finally grind , to obtain the surface-coated strontium aluminate long-lasting luminescent powder.

Embodiment 3

[0038] The first step: Add 2g of strontium aluminate long-lasting luminous powder SrAl 2 o 4 :Eu 2+ , Dy 3+ Disperse in 20g of triethyl phosphate, and keep stirring for 10 hours to form a suspension;

[0039] The second step: move the suspension into a high-pressure reactor with a polytetrafluoroethylene liner, seal it and place it in an oven at 240°C for 12 hours;

[0040] Step 3: Take out the autoclave, cool to room temperature, centrifuge to remove the reaction residue in the autoclave, then wash with absolute ethanol for 3 times, then dry in a vacuum drying oven at 80°C for 8 hours, and finally grind , to obtain the surface-coated strontium aluminate long-lasting luminescent powder.

[0041] The afterglow attenuation curves of the obtained surface-coated strontium aluminate long-lasting luminescent powder (sample 3) and the non-surface-coated strontium aluminate long-lasting luminescent powder (sample 1) after 10 minutes of irradiation with 375nm ultraviolet light are ...

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Abstract

The invention discloses a surface coating method for the strontium aluminate long persistence luminescent powder. The method comprises the following steps: firstly, the strontium aluminate long persistence luminescent powder and phosphoric acid tributyl ester are mixed and fully agitated, and a mixture of the strontium aluminate long persistence luminescent powder and the phosphoric acid tributylester is obtained; wherein, the mass ratio of the strontium aluminate long persistence luminescent powder and the phosphoric acid tributyl ester is between 1 to 2 and 1 to 20; secondly, the mixture is put into a high pressure reactor, then the high pressure reactor is put into a baking box at a temperature of 100 DEG C to 260 DEG C after being sealed, and the baking lasts for 6 hours to 100 hours; thirdly, the high pressure reactor is taken out and is cooled to the room temperature, the residual solution of the reaction can be removed through centrifugal separation, the scrubbing can be performed for 2 to 3 times by using absolute ethyl alcohol, then the grinding can be performed after vacuum drying, and the surface coated strontium aluminate long persistence luminescent powder is obtained. The surface coating method provided by the invention has the advantages that the art is simple, the operation is convenient, and the method is suitable for industrialization production and can be used for enhancing the illumination performance of the luminescent material.

Description

technical field [0001] The invention relates to a method for surface coating of strontium aluminate long-lasting luminescent powder. Background technique [0002] With the development of science and technology, long-lasting photoluminescent materials have been widely used in industries such as rubber, plastics, coatings, ceramics and cement, and their preparation and application research has become extremely important. [0003] Traditional sulfide long-afterglow luminescent materials have short afterglow time, are radioactive, have unstable chemical properties, and are easy to decompose or chemically react with other substances. Rare earth doped alkaline earth metal strontium aluminate SrAl 2 o 4 :Eu 2+ , Dy 3+ Compared with sulfide long afterglow materials, long afterglow luminescent materials have the advantages of high brightness, long afterglow time, good stability and anti-aging performance, and do not contain radioactive elements. In the 1990s, industrial-scale pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/80
Inventor 刘应亮朱勇
Owner JINAN UNIVERSITY