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Alumina coated fluorescent powder and its coating method

A technology of phosphor powder and alumina, applied in the field of phosphor powder, can solve the problems of difficulty in controlling the thickness of the coating layer, long coating period, difficult industrialization, etc., to improve the resistance to thermal degradation and work degradation, and the continuous coating layer. Uniform, strong film bonding effect

Inactive Publication Date: 2005-09-14
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.
For example, the sol-gel method that has been studied more at present, although the method is simple and easy to operate, the coating layer is not uniform, it is difficult to control the thickness of the coating layer, and during the heating process, the powders are prone to agglomeration , In addition, the coating cycle is too long, there are many processes, and it is difficult to realize industrialization, which is also a shortcoming of its existence.

Method used

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  • Alumina coated fluorescent powder and its coating method

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Effect test

Embodiment 1

[0026] Alumina-coated phosphor powder for color plasma flat-panel displays, characterized in that the surface of the phosphor powder is coated with Al 2 o 3 film, in Al 2 o 3 You can choose to coat TiO on the outside of the film 2 Membrane, In 2 o 3 Membrane, ZrO 2 film or rare earth oxide La 2 o 3 The film can also be fully covered in turn. In this example, the Al 2 o 3 The film is coated with TiO 2 film, coated with In on the phosphor surface 2 o 3 film, coated with ZrO on the phosphor surface 2 film, and finally, coating the surface of the phosphor with La 2 o 3 .

Embodiment 2

[0028] A film coating method for implementing the above alumina-coated phosphor:

[0029] 1) Use a conjugate acid-base system with a pH value between 4.5 and 6.0 to make a buffer, and the concentration of the buffer is greater than 0.1M and less than 1M, according to Al 2 o 3 The weight ratio with phosphor is (0.25~20): 100 ratio, in the present embodiment, can press Al 2 o 3 The weight ratio to the phosphor is 0.25:100, 15:100, 2:100, 7:100, or 12:100, and the corresponding amount of water-soluble aluminum salt is weighed and prepared into a water-soluble aluminum salt with a concentration of 0.01-1.0M. Aluminum salt solution, for example: to prepare a water-soluble aluminum salt titration solution with a concentration of 0.01M, 1M, 0.07M, 0.12M, 0.56M or 0.82M, the above-mentioned conjugate acid-base system can have a pH value of 4.75 and a concentration of 0.1M acetic acid-sodium acetate conjugate acid-base system, citric acid-NaOH conjugate acid-base system with a pH va...

Embodiment 3

[0035] 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.

[0036] Weigh 23g of NaAc solid and dissolve it in a small amount of distilled water, then add 27ml of concentrated HAc, then add 5ml of 0.1% Tween 80 dispersant, and finally add water to dilute to 500ml to obtain a buffer solution with pH=4.5. Add 10 g of alkaline pretreated BAM blue powder to the buffer solution, disperse with ultrasonic waves for 10 min, and heat to 30°C in a water bath. Weigh 1.88gAl(NO 3 ) 3 9H 2 O solid solution is made into 100ml solution, is added in the fluorescent powder coating mother liquor with the drop rate of 5ml / min, aging 30min after finishing, is that the NaOH solution of concentration is 0.05M adjusts the pH value of mother liquor to 6.5, centrifuges afterwards, washes with ...

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Abstract

This invention is alumina diolame phosphor powder; it is coated of Al2O3 on phosphor powder surface. Its coating method is that buffer solution is made-up by conjugate acid-base system eith Ph value is between 4.5~6.0, and its concentration is between 0.1M and 2M. Concentration is 0.01~1.0M water soluble aluminium salt solution is made-up by Al2O3 and phosphor powder and equal quality water soluble aluminium salt, the weight ratio of Al2O3 and phosphor powder is (0.25~20):100. Phosphor powder is added into buffer solution to make-up water soluble aluminium salt of 0.0.1~1.0M concentration. It is agitated and ultra sonic dispersed to make phosphor powder disperse in buffer solution. The phosphor powder suspension is heated to 20~600C, and agitated at speed of 100r / m~300r / m, then water soluble aluminium salt is added into suspension, dropwise velocity is 5~500ml / min. The temperature is holding and agitated for 30~120min. Finally, mother liquor is adjusted by alkali solution to pH value is 6~7, then alumina hydrate is got. alumina diolame phosphor powder is got after separation, water washing, dehydration, and is dried at 60~1200C to make water content of phosphor powder is low of 0.25%, and ignited 1~3hours at 200~4000C and air cooling in stove.

Description

technical field [0001] The invention relates to a fluorescent powder, in particular to an aluminum oxide-coated fluorescent powder used in a plasma flat panel display device and a film 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 100-200nm, and the main excitation bands are around 147nm and 172nm. [0003] At present, the composition of the red, green and blue three primary color phosphors most commonly used in the PDP field is: 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 of plasma display...

Claims

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Application Information

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IPC IPC(8): C09K11/02H01J11/42H01J17/16
Inventor 董岩蒋建清梁超于金方峰
Owner SOUTHEAST UNIV
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