Silicon oxide coated fluorescent powder and its coating method

A technology of fluorescent powder and silicon oxide, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of difficult control of coating layer thickness, poor protection effect, uneven coating layer, etc., to improve thermal degradation resistance and Anti-work degradation performance, continuous, uniform and compact coating layer, and shortened process cycle

Inactive Publication Date: 2005-09-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using general phosphor coating technology, the protection effect on thermal degradation, especially VUV radiation degradation is not good.
Patent CN1506438A actually uses sol to coat the PDP phosphor. Although the method is simple and easy to operate, the coating layer is uneven and it is difficult to control the thickness of the coating layer.

Method used

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  • Silicon oxide coated fluorescent powder and its coating method
  • Silicon oxide coated fluorescent powder and its coating method

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A silicon oxide-coated phosphor powder for a color plasma flat panel display is coated with SiO on the surface of the phosphor powder 2 The envelope, the SiO 2 The outside of the envelope can also be coated with La 2 o 3 and ZrO 2 , constitute the composite coating, in this example, in SiO 2 The outer coating of the envelope is ZrO 2 Coating, coating the outside of the phosphor coating with La 2 o 3 envelope.

Embodiment 2

[0026] A coating method for preparing the above coated fluorescent powder:

[0027] 1) Use distilled water to make the fluorescent powder of the color plasma flat panel display into a fluorescent powder suspension with a concentration of 0.2% to 5%. 2 Weigh the corresponding amount of Na with a mass ratio of (0.5-20): 100 to the phosphor 2 SiO 3 9H 2 O, and add phosphor suspension, ultrasonically disperse and stir for 10-30min to make Na 2 SiO 3 Dissolve and make the phosphor suspension in a stable state, with HCl, HNO 3 or H 2 SO 4 As a precipitating agent, it is prepared into a solution with a concentration of 0.01-2M, and the above-mentioned SiO 2 The mass ratio to phosphor can be selected as 05:100, 20:100, 1.5:100, 5:100, 6.4:100, 8:100, 10:100, 13:100 or 16:100, and SiO 2 The dosage is preferably 5-10wt% of the total mass of the phosphor, and the concentration of the above-mentioned precipitant can be selected as 0.05, 0.1, 0.5 or 1M; before preparing the phospho...

Embodiment 3

[0031] Weigh 50g of BaMgAl for PDP 10 o 17 :Eu 2+ Phosphor powder (BAM) was put into NaOH solution with a concentration of 0.5M, soaked for 24 hours, then separated and dehydrated with a centrifuge, and washed with distilled water until the supernatant was neutral.

[0032] Weigh the alkaline pretreated PDP phosphor BaMgAl 10 o 17 :Eu 2+ Put 10g of blue powder into a small amount of distilled water, and disperse it ultrasonically for 30 minutes. by SiO 2 / Phosphor powder = 2.5wt% ratio weighs 1.18gNa 2 SiO 3 9H 2 O Add the phosphor suspension, and add 5ml of 0.1% Tween 80 dispersant to the phosphor suspension, and finally add water to dilute to 500ml, stir for 30min to obtain a uniformly dispersed coating mother liquor. Heat the mother liquor water bath to 60°C and keep it warm, vigorously stir the mother liquor pair (stirring speed: 200r / m), slowly drop the HCl solution with a concentration of 0.25M into the mother liquor until the pH value is equal to 6-9, and the ...

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Abstract

Disclosed is the silicon oxide integument phosphor powder covered with silicon oxide on the surface of the phosphor powder. The method of integument comprising: preparing suspension at the concentration 0.2~5% with color plasma panel display phosphor powder and water, weighing relevant quantity of sodium silicate with nine water according to the proportion between silicon oxide and phosphor powder by weight (0.5~20): 100, adding to the phosphor powder suspension, dispersing with supersonic wave and stirring to make it dissolved and the phosphor powder suspension stable, employing strong acid as precipitator and preparing solution with concentration 0.01~2M; heating the phosphor powder suspension to 20~120 DEG C, stirring and dispersing with supersonic wave at the same time, stirring with speed 100r / m~ 300r / m and dropping the precipitator into the phosphor powder suspension at the speed of 5~500ml / min to make the pH value 3~11, then keeping the temperature and stirring for 30~180 minutes; getting the integument phosphor powder after centrifugalizating the phosphor powder suspension, washing, dewatering and drying at 60-120DEG C to make the integument phosphor powder moisture percentage below 0.25%,incandescing at 200~400 DEG C for 1~3hours and air cooling in the furnace.

Description

technical field [0001] The invention relates to a fluorescent powder for a color plasma flat panel display and a related processing method, in particular to a silicon oxide-coated fluorescent powder for a color plasma flat panel display and a coating method thereof. Background technique [0002] The color plasma display panel (Plasma Display Panel, PDP) uses the vacuum ultraviolet (VUV) generated by the discharge of an inert mixed gas (also known as Penning gas) to excite phosphors to achieve the purpose of imaging. The excitation wavelength range of phosphor powder for PDP is 100-200mm, and the main excitation bands are around 147nm and 172nm. [0003] At present, the most commonly used three-color phosphor components in the PDP field are: red powder (Y 2 o 3 :Eu 3+ , (Y, Gd)BO 3 :Eu 3+ ), green powder (ZnSiO 4 :Mn 2+ , BaAl 12 o 19 :Mn 2+ ), blue powder (BaMgAl 10 o 17 :Eu 2+ ) These types of phosphors have been widely used in the field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02
Inventor 蒋建清董岩梁超于金方峰
Owner SOUTHEAST UNIV
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