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Coated silicate fluorescent powder and film-coating method thereof

A fluorescent powder and silicate technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of weak dry powder ball milling coating, easy hydrolysis of silicate fluorescent powder, and affecting performance, etc., to achieve strong water and weather resistance The effects of maintaining performance, maintaining performance, and prolonging service life

Active Publication Date: 2014-04-16
QIDONG CHUANGLYU GREENING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicate phosphor is easy to hydrolyze, which affects performance, making it difficult to implement coating methods such as sol-gel method and hydrolysis method; while dry coating, the temperature of melting method is too high, which affects performance, and the coating of dry powder ball milling method is not firm.

Method used

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  • Coated silicate fluorescent powder and film-coating method thereof
  • Coated silicate fluorescent powder and film-coating method thereof
  • Coated silicate fluorescent powder and film-coating method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix 3.012g silicate orange red powder and 0.302g silicon dioxide in a ball mill for 30 minutes, then add agate balls with a particle size of 1-3mm and dry grind for 45 minutes. After the powder passes through a 300-mesh sieve, use N 2 Suspended in a small fluidized bed reactor, and then passed into the fluidized bed reactor mixed with 0.031g of trimethylaluminum N 2 , the temperature inside the reactor was 170°C, and after 60 min, a mixture containing 5% O 3 O 2 , reacted for 1 hour, and passed the powder through a 300-mesh sieve to obtain a coated silicate phosphor.

Embodiment 2

[0033] Mix 3.020g of silicate green powder and 0.317g of silicon dioxide in a ball mill for 30 minutes, then add agate balls with a particle size of 1-3mm and dry grind for 45 minutes. After the powder passes through a 300-mesh screen, use N 2 Suspended in a small fluidized bed reactor, and then passed into the fluidized bed reactor mixed with 0.032g of trimethylaluminum N 2 , the temperature inside the reactor was 170°C, and after 60 min, a mixture containing 5% O 3 O 2 , reacted for 1 hour, and passed the powder through a 300-mesh sieve to obtain a coated silicate phosphor.

[0034] The scanning electron microscope pictures of silicate green powder before and after coating are as follows: figure 1 with 2 shown. Depend on figure 1 with figure 2 It can be seen that figure 2 coated phosphor with figure 1 The surface of the uncoated phosphor has obvious differences under the scanning electron microscope, and it can be seen that the surface of the phosphor is successful...

Embodiment 3

[0036] Mix 4.517g of silicate orange red powder and 0.311g of silicon dioxide in a ball mill for 30 minutes, then add agate balls with a particle size of 1-3mm and dry grind for 60 minutes. After the powder passes through a 250-mesh screen, use N 2 Suspended in a small fluidized bed reactor, and then passed into the fluidized bed reactor mixed with 0.094g trimethylaluminum N 2 , the temperature inside the reactor was 185°C, and after 60 min, a mixture containing 5% O 3 O 2 , reacted for 1 hour, and passed the powder through a 300-mesh sieve to obtain a coated silicate phosphor. Spectra of orange-red silicate phosphor before and after coating image 3 shown.

[0037] Depend on image 3 It can be seen that the orange-red silicate phosphor emits light at 590 nm, and the luminous intensity after coating is higher than that before coating.

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Abstract

The invention discloses coated silicate fluorescent powder. According to the invention, an inner core adopts silicate fluorescent powder and coated with an inner shell layer and an outer shell layer, the inner shell layer adopts SiO2, and the outer shell layer adopts Al2O3. The invention further provides a film-coating method of the silicate fluorescent powder. The method comprises the following steps: (1) mixing fluorescent powder and SiO2 according to the mass ratio of (10-20):1, dry grinding and sieving; (2) placing the sieved powder in a fluidized bed reactor, and feeding N2 to enable the powder to suspend in the fluidized bed reactor; (3) mixing trimethylaluminum with N2, and feeding the mixture in the reactor, wherein the mass of the trimethylaluminum is 0.3-2% of that of the fluorescent powder; (4) feeding O2 containing O3 at 170-200 DEG C, and reacting for 1-2 h. According to the invention, the method is simple, the controllability is high, and the thickness of a film can be accurately controlled; the luminance of fluorescent powder can be improved through SiO2 coating , and the strength and the adhesive force of the film can be improved through Al2O3 coating, so that the water-tolerant and weather-resisting properties of fluorescent powder can be effectively improved, the luminescence property of fluorescent powder is optimized, and the service life of fluorescent powder is prolonged.

Description

technical field [0001] The invention relates to a coated silicate fluorescent powder and a surface treatment method thereof, in particular to a silicate fluorescent powder for LED and a coating method thereof. Background technique [0002] With the expansion of white LED production scale, silicate phosphor has become a research hotspot in recent years due to its wide excitation spectrum and rich luminous colors. However, the water resistance and heat resistance of the silicate phosphor are poor, which seriously affects the wide application of the silicate phosphor. In order to improve the stability of the phosphor powder, coating the surface thereof is a relatively common method at present. However, the silicate phosphor is easily hydrolyzed, which affects performance, making it difficult to implement coating methods such as sol-gel method and hydrolysis method; while dry coating, the temperature of melting method is too high, which affects performance, and the coating of d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59C09K11/02
Inventor 林静涛黎广才
Owner QIDONG CHUANGLYU GREENING ENG CO LTD
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