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Magnesia coated fluorescent powder and its coating method

A magnesium oxide coating and phosphor technology, which is applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of difficulty in controlling the thickness of the coating layer, uneven coating layer, etc., so as to improve the resistance to thermal degradation and work degradation. Performance, not easy to fall off, continuous and uniform effect of the coating layer

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

At present, sol is used to coat PDP phosphors. Although this 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of magnesium oxide coating phosphor powder that is used for color plasma flat panel display is characterized in that the surface of phosphor powder is coated with MgO film,

[0026] On the outside of the MgO film, ZrO can be optionally coated 2 film, ZnO film or TiO 2 MgO film can also be fully coated in sequence. In this embodiment, the surface of the MgO film is coated with ZrO 2 film, in ZrO 2 The surface of the film is coated with ZnO film, and the surface of ZnO film is coated with TiO 2 membrane.

Embodiment 2

[0028] A kind of coating method that is used to manufacture above-mentioned magnesium oxide coated fluorescent powder is characterized in that:

[0029] 1) Use a conjugate acid-base system with a pH value between 8.0 and 12.0 to prepare a pH buffer solution and the concentration of the buffer solution is greater than 0.1M and less than 2M, and the weight ratio of MgO to phosphor is (0.25~15): The ratio of 100, weigh the corresponding amount of water-soluble magnesium salt, the weight ratio of MgO and phosphor can be 0.25:100, 15:100, 2:100, 7:100, or 12:100, and prepare it as A water-soluble magnesium salt titration solution with a concentration of 0.01-1M, for example: a water-soluble magnesium 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 be It is a boric acid-NaOH conjugate acid-base system with a pH value of 8.5 and a concentration of 1M, and NH with a pH value of 10.2 and a conce...

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 29g NH 4 Dissolve the solid Cl in a small amount of distilled water, then add 33ml concentrated NH 3 ·H 2 O, add 5 ml of 0.1% Tween 80 dispersant, and finally add water to dilute to 500 ml to obtain pH=9.2 buffer solution. Weigh 10 g of alkaline pretreated BAM blue powder and add it to the buffer solution, disperse with ultrasonic waves for 10 min, and heat to 25°C in a water bath. Weigh 1.27gMgCl·6H 2 O solid solution was made into 125ml solution, slowly dripped into phosphor coating mother liquor at a dripping speed of 8ml / min, aged for 30min after dripping, centrifuged, washed twice with water, dehydrated twice with absolute ethanol, and dried at 100°C , and finally burned at 250°C to obtain...

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PUM

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Abstract

Disclosed is the magnesia integument phosphor powder covered with magnesia on the surface of the phosphor powder.The method of integument comprising: preparing pH buffer with the concentration between 0.1-0.2M by employing conjugate acid and base system with the pH value between 8.0-12.0, weighing relevant quantity of water-soluble magnesium salt according to the proportion between magnesia and phosphor powder by weight (0.25~15): 100, preparing water-soluble magnesium salt volumetric solution with the concentration between 0.01~1M; preparing phosphor powder suspension with the concentration 0.2~5% by adding the phosphor powder into the buffer, stirring, dispersing with supersonic wave to make the phosphor powder dispersed in the buffer; heating the phosphor powder suspension to 20~70 DEG C and keeping the temperature, stirring with speed 100r / m~ 300r / m and dropping the water-soluble magnesium salt volumetric solution into the phosphor powder suspension at the speed of 2~15ml / min, then keeping the temperature and stirring for 30~180 minutes and getting the integument phosphor powder suspension, separating, washing, dewatering and drying at 60-120DEG C, making the integument phosphor powder moisture percentage below 0.25%,incandescing at 200~400 DEG C for 1~3 hours and air cooling in the furnace.

Description

technical field [0001] The invention relates to a fluorescent powder and a processing method thereof, in particular to a magnesium 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 the inert mixed gas to excite the phosphor powder 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 displa...

Claims

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Application Information

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IPC IPC(8): C09K11/02
Inventor 梁超蒋建清董岩于金方峰
Owner SOUTHEAST UNIV
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