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Alumina coated fluorescent powder and its coating method

A fluorescent powder and film coating technology, applied in the field of fluorescent powder, can solve problems such as difficulty in controlling the thickness of the coating layer, long coating cycle, and difficult industrialization, so as to improve the performance of thermal degradation resistance and work degradation resistance, and the coating layer The effect of continuous uniformity and strong bonding force of the film layer

Inactive Publication Date: 2007-01-17
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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Embodiment 1

[0026] Alumina coated phosphor for color plasma flat panel display, which is characterized in that the surface of the phosphor is coated with Al 2 O 3 Membrane, in Al 2 O 3 TiO can be optionally coated outside 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 sequence. In this embodiment, the Al 2 O 3 Film coated with TiO 2 Film, and then coated with In on the phosphor surface 2 O 3 Film, and then coat ZrO on the phosphor surface 2 Film, finally, coating La on the phosphor surface 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 between 4.5 and 6.0 to prepare a buffer and the concentration of the buffer is greater than 0.1M and less than 1M, press Al 2 O 3 The weight ratio to phosphor is (0.25~20): 100 ratio. In this embodiment, it can be 2 O 3 The weight ratio to the phosphor is 0.25: 100, 15: 100, 2: 100, 7: 100, or 12: 100. Weigh the corresponding amount of water-soluble aluminum salt and prepare it into a water-soluble solution with a concentration of 0.01-1.0M Aluminium salt solution, for example: formulated into 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 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 pH 5.0 and concentration of 1.0M or potassium...

Embodiment 3

[0035] Weigh 50g of BaMgAl for PDP 10 O 17 :Eu 2+ Phosphor powder (BAM) is put into 0.5M NaOH solution, soaked for 24h, and then separated and dehydrated with a centrifuge, and then washed with distilled water until the supernatant is neutral.

[0036] Weigh 23g of NaAc solid and melt 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 with pH=4.5. Take 10g of alkaline pretreated BAM blue powder and add it to the buffer solution, disperse with ultrasonic for 10min, and heat to 30°C in a water bath. Weigh 1.88gAl(NO 3 ) 3 ·9H 2 The O solid solution was made into 100ml solution, and added to the phosphor coating mother liquor at a dropping rate of 5ml / min. After the completion of aging for 30min, the pH value of the mother liquor was adjusted to 6.5 with a concentration of 0.05M NaOH solution, and then centrifuged and washed 2 Second, dehydrated with absolute...

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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 (PDP) uses vacuum ultraviolet (VUV) generated by the discharge of an inert mixed gas (also known as Penning gas) to excite phosphors to achieve visualization purposes. The excitation wavelength range of phosphors for PDP is 100-200nm, and the main excitation bands are around 147nm and 172nm. [0003] At present, the most commonly used red, green and blue phosphors in the field of PDP 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 kinds of phosphors have been widely used in the field of plasma displays due to their good luminous efficiency and chemical stability. [0004] However, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02H01J17/04H01J11/42H01J17/16
Inventor 董岩蒋建清梁超于金方峰
Owner SOUTHEAST UNIV
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