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Silicate fluorescent powder for enveloping LEDs (light-emitting diodes) and enveloping method thereof

A phosphor and silicate technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem that phosphors are easily hydrolyzed when exposed to water, so as to improve the encapsulation luminous efficiency and aging performance, improve luminous efficiency and aging The effect of performance, method is simple

Active Publication Date: 2013-01-30
JIANGSU BREE OPTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, silicon dioxide, magnesium oxide, aluminum oxide, etc. are used for coating. This inorganic coating method cannot solve the problem of phosphor powder being easily hydrolyzed when it encounters water.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add 0.5g of oxalic acid into 10g of deionized water and stir to obtain a solution A with a pH value of 5.5. Mix 100g of vinyl tris(β-methoxyethoxy)silane coupling agent (A-172) with solution A. Stir at 30°C for 90 min to completely hydrolyze the silane coupling agent to obtain 110.5 g of hydrolyzed coupling agent B. 2000g(Sr,Ba,Ca,Mg) 2 SiO 4 :Eu 2+ Disperse the green powder in 2000g of xylene to form a silicate phosphor dispersion; heat the silicate phosphor dispersion in a water bath at a temperature of 70°C, stir and ultrasonically disperse for 30min at the same time, stirring speed: 2000r / m; g Hydrolyzed coupling agent B was added to the silicate phosphor dispersion at one time, and after the addition, continued to stir at the above water bath temperature for 120 min to obtain a silicate phosphor dispersion for coated LEDs. After centrifuging the coated LED with a silicate phosphor dispersion, wash it twice with deionized water, and then dehydrate it twice with a...

Embodiment 2

[0036] 1g HNO 3 Add it into 99g of deionized water and stir to obtain a solution A with a pH value of 4.5. Mix 100g of γ—(2,3-glycidoxy)propyltrimethoxysilane coupling agent (KH-560) with solution A. Stir at 50°C for 60 min to completely hydrolyze the coupling agent to obtain 200 g of hydrolyzed coupling agent B. 300g(Sr,Ba,Ca,Mg) 2 SiO 4 :Eu 2+ Disperse the green powder in 450g of o-xylene to form a silicate phosphor dispersion. Heat the silicate phosphor dispersion in a water bath at a temperature of 80°C. Stir while ultrasonically dispersing for 100min. Stirring speed: 1000r / m. Add 200g of hydrolysis coupling agent B dropwise to the silicate phosphor dispersion at a rate of 15ml / min, and continue stirring at the above water bath temperature for 90min after adding to obtain a silicate phosphor dispersion for coated LEDs. After centrifuging the coated LED with a silicate phosphor dispersion, wash it twice with deionized water, and then dehydrate it twice with absolute eth...

Embodiment 3

[0042] 10gH 2 SO 4 Add it into 490g of deionized water and stir to obtain a solution A with a pH value of 3. Mix 50g of vinyltriethoxysilane coupling agent (A-151) with solution A, and stir at 45°C for 120min to make the coupling agent Completely hydrolyzed to obtain 500g of hydrolyzed coupling agent B. 1250g(Sr,Ba,Ca,Mg)3SiO 5 :Eu 2+ Disperse the red orange powder in 2500g styrene to form a silicate phosphor dispersion; heat the silicate phosphor dispersion in a water bath at a water bath temperature of 90°C, stir and ultrasonically disperse for 80min at the same time, stirring speed: 3000r / m; mix 500g The hydrolytic coupling agent B was added dropwise to the silicate phosphor dispersion at a rate of 20ml / min, and after addition, continued to stir at the above water bath temperature for 60 minutes to obtain a silicate phosphor dispersion for coated LEDs. After centrifuging the coated LED with a silicate phosphor dispersion, wash it twice with deionized water, and then deh...

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PUM

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Abstract

The invention relates to a silicate fluorescent powder for enveloping LEDs (light-emitting diodes). A silane coupling agent film is coated on the surface of the silicate fluorescent powder for LEDs. The invention also relates to an enveloping method of the silicate fluorescent powder for enveloping LEDs. The silane coupling agent is utilized to organically coat the surface of the silicate fluorescent powder for LEDs so as to obtain a continuous uniform compact enveloping layer on the surface of the fluorescent powder, thereby effectively preventing the silicate fluorescent powder matrix for LEDs from contacting water, solving the problem of high hydrolysis tendency in the fluorescent powder, and greatly enhancing packaging light effect and aging resistance of the silicate fluorescent powder for LEDs.

Description

technical field [0001] The invention relates to a method for surface treatment of LED silicate fluorescent powder, in particular to a silicate fluorescent powder for coating LED and a coating method thereof. Background technique [0002] As a new type of solid-state light source, white LED has great application prospects in the field of lighting and display due to its advantages of energy saving, environmental protection, long life and small size. From the birth of the first blue light chip to the present more than ten years, the development of white light LED is extremely rapid. Traditionally packaged white light LED with low power and ultra-high brightness has been industrialized eight years ago and has shown good development in recent years. The development momentum, and a relatively complete industrial chain from epitaxy, chips, phosphors, packaging to applications has been basically realized in China, and countries all over the world are also paying attention to and inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/59
Inventor 刘凯何锦华梁超符义兵滕晓明张超
Owner JIANGSU BREE OPTRONICS CO LTD
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