Long persistence phosphor of alkali earth aluminate for SiO2 glass painting and its prepn. method thereof

A long afterglow phosphor, alkaline earth aluminate technology

Inactive Publication Date: 2004-07-28
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the purposes of the present invention is to disclose a surface with SiO 2 Glass-coated alkaline earth aluminate long-lasting phosphors to overcome the poor heat resistance and water resistance and the luminous brightness of the prior art that are limited by SiO 2 Defects reduced by masking of crystal grains;

Method used

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  • Long persistence phosphor of alkali earth aluminate for SiO2 glass painting and its prepn. method thereof
  • Long persistence phosphor of alkali earth aluminate for SiO2 glass painting and its prepn. method thereof
  • Long persistence phosphor of alkali earth aluminate for SiO2 glass painting and its prepn. method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 10g ethyl orthosilicate, 5gH 2 O, 76gC 2 h 5 OH and 0.2g HCl were mixed, and ethyl orthosilicate was added under the condition of stirring, and the stirring was continued for 15 minutes to become a uniform transparent solution, which was aged at 40°C for 72 hours. Take 46g strontium aluminate long afterglow phosphor (emission main peak 520nm, particle size d 50 35 μ) was mixed with the above transparent solution and stirred for 15 minutes, filtered and dried naturally. Then heat treatment at 350°C for 30 minutes to obtain SiO 2 5% coating with SiO 2 Glass coated alkaline earth strontium aluminate long persistence phosphor. They were then soaked in water and heated at 500°C-900°C for 30 minutes to observe their pH and relative brightness. Such as figure 1 , figure 2 and image 3 As shown, the results show that the pH is 6.5 after soaking in the aqueous solution for more than 1000 hours, and the relative luminous brightness is 100%. The relative luminance after...

Embodiment 2

[0062] 10g ethyl orthosilicate, 7gH 2 O, 76g C 2 h 5 OH, 0.1gCH 3 COOH was mixed, and ethyl orthosilicate was added under the condition of stirring, and the stirring was continued for 15 minutes to become a uniform transparent solution, which was aged at 50° C. for 48 hours. Take 30g of commercial calcium aluminate long afterglow phosphor (emission main peak 420nm, particle size d 50 40μ) mixed with the above transparent solution for 15 minutes, filtered, dried naturally, and then heat-treated at 320°C for 30 minutes to obtain SiO 2 10% coating with SiO 2 Glass coated alkaline earth calcium aluminate long persistence phosphor. They were then soaked in water and heated at 500°C-900°C for 30 minutes to observe their pH and relative brightness. Such as Figure 4 , Figure 5 and Figure 6As shown, the results are shown as follows: the pH is 7.0 after soaking in the aqueous solution for more than 1000 hours, and the relative luminous brightness is 100%. The relative lumin...

Embodiment 3

[0064] Using the same method as in Example 1, and with 0.1g H 2 SO 4 Instead of HCl, the results are as follows: the pH is 6.5 after soaking in the aqueous solution for more than 1000 hours, and the relative luminance is 100%. The relative luminance after heat treatment at 900°C is 85%.

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Abstract

The present invention discloses an alkaline earth aluminate long-afterglow phosphor powder with SiO2 glass coating layer and its preparation method. This invented preparation method includes the following steps: hydrolyzing silicate in an aqueous solution containing cosolvent and catalyst to obtain an uniform transparent solution, mixing the above-mentioned alkaline earth aluminate long-afterglow phosphor powder and the above-mentioned obtained solutino according to a certain proportion, filtering, drying and heating so as to obtain the invented alkaline earth aluminate long-afterglow phosphor powder with SiO2 glass coating layer. It not only can raise water-proofing and heat-resisting properties, but also does not affect its luminous performance, and its preparation process is simple and easy to implement industrial production.

Description

technical field [0001] The invention relates to an alkaline earth aluminate long afterglow fluorescent powder and a preparation method thereof. Background technique [0002] With the high development of science and technology, long-lasting photoluminescent energy storage luminescent materials have attracted people's attention, such as the dial display of aviation instruments and automobile instruments, coatings, enamel, cement and arts and crafts, etc. have practical applications. It is particularly noteworthy that when the luminous paint is used as road lighting, architectural signs, and fire signs, it can solve the problem of power outages caused by sudden accidents such as earthquakes and fires, thereby saving people's lives. [0003] The earlier long-lasting phosphors are sulfide luminescent materials, including CuS:Bi, CaSrS:Bi, ZnS:Cu and ZnCdS:Cu, etc., which are the first generation of long-lasting phosphors with practical application significance. However, the mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02
Inventor 杨云霞徐志珍唐泽伸章群龄
Owner EAST CHINA UNIV OF SCI & TECH
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