Preparation method of vacuum ultraviolet excited green silicate fluorescent powder

A green fluorescent powder and vacuum ultraviolet technology, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of affecting the image quality, long afterglow time, shortening the afterglow time of phosphor powder, etc., to achieve improved luminous performance, simple process operation, The effect of shortening the afterglow time

Inactive Publication Date: 2013-04-17
LANZHOU UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The green powder Zn 2 Si0 4 :Mn 2+ It is widely used because of its advantages of high luminous efficiency, good chemical stability and good color purity, but due to Mn 2+ The spin prohibition of ( 4 T 1 → 6 A 1 ) emission, resulting in a longer afterglow time, the afterglow time is about 11.9ms, which is prone to smearing in the PDP display, which affects the image quality, and cannot meet the requirement of display imaging technology less than 5ms
The existing preparation method increases the activator Mn 2+ ion concentration to shorten the afterglow time of phosphors, but increase the Mn 2+ The concentration will reduce the luminous intensity of the phosphor

Method used

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  • Preparation method of vacuum ultraviolet excited green silicate fluorescent powder
  • Preparation method of vacuum ultraviolet excited green silicate fluorescent powder
  • Preparation method of vacuum ultraviolet excited green silicate fluorescent powder

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Embodiment 1

[0027] According to the green phosphor Zn 1.92-x-2y Mg x Y y Li y SiO 4 :0.0gMn 2+ The stoichiometric ratio of silicic acid, zinc oxide, manganese acetate, magnesium oxide, yttrium oxide and lithium carbonate were mixed to form the starting raw material, and the ratio of adding 1ml of absolute ethanol to 10 grams of starting raw material was used to obtain absolute ethanol , adding absolute ethanol to the starting material for ball milling, mixing evenly to obtain a raw material powder; putting the raw material powder into a tube furnace, keeping it warm for 5 hours at a temperature of 1200 ° C and feeding nitrogen, and then, using The cooling rate of 1°C / min lowers the temperature in the tube furnace to 800°C. At this time, stop feeding nitrogen, and pass a mixed gas composed of 90% nitrogen and 10% hydrogen into the tube by volume percentage. Type furnace, keep warm for 5 hours, and cool with the furnace to obtain calcined powder; grind the calcined powder, then wash wi...

Embodiment 2

[0029] According to the green phosphor Zn 1.92-x-2y Mg x Y y Li y SiO 4:0.08Mn 2+ The stoichiometric ratio of silicon dioxide, zinc oxide, manganese acetate, magnesium oxide, yttrium oxide and lithium carbonate were mixed to form the starting raw material, and 3ml of absolute ethanol was added to 10 grams of starting raw material, and anhydrous Ethanol, adding absolute ethanol to the starting raw materials, grinding, and mixing uniformly to obtain raw material powders; putting the raw material powders into a tube furnace, keeping the temperature at 1350° C. and feeding nitrogen for 3 hours, and then , at a cooling rate of 6°C / min, lower the temperature in the tube furnace to 1000°C, at this time, stop feeding nitrogen, and feed a mixed gas consisting of 95% nitrogen and 5% hydrogen by volume The tube furnace is kept warm for 1 hour and cooled with the furnace to obtain calcined powder; the calcined powder is ground, then washed with deionized water, dried, and passed thro...

Embodiment 3

[0031] According to the green phosphor Zn 1.92-x-2y Mg x Y y Li y SiO 4 :0.08Mn 2+ The stoichiometric ratio of silicic acid, zinc oxide, manganese acetate, magnesia, yttrium oxide and lithium carbonate were mixed to form the starting material, and 2ml of dehydrated alcohol was added to 10 grams of the starting material, and dehydrated alcohol was taken , adding absolute ethanol to the starting raw material, ball milling, and mixing uniformly to obtain a raw material powder; put the raw material powder into a tube furnace, and keep it warm for 4 hours at a temperature of 1275 ° C and nitrogen gas, and then, With a cooling rate of 3.5°C / min, the temperature in the tube furnace is reduced to 900°C. At this time, the feeding of nitrogen is stopped, and a mixed gas consisting of 92.5% nitrogen and 7.5% hydrogen is passed into the furnace by volume. Tube furnace, keep warm for 3 hours, and cool with the furnace to obtain calcined powder; grind the calcined powder, then wash wit...

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Abstract

The invention relates to a preparation method of vacuum ultraviolet excited green silicate fluorescent powder. The formula of the green silicate fluorescent powder is Zn1.92-x-2yMgxYyLiySiO4:0.08Mn2+ (x is greater than or equal to 0 and smaller than or equal to 0.12, y is greater than or equal to 0 and smaller than or equal to 0.03). The preparation method comprises the following steps of: respectively taking silicic acid or silicon dioxide, zinc oxide, manganese acetate, magnesium oxide, yttrium oxide and lithium carbonate, taking absolute ethyl alcohol, and grinding to obtain raw material powder; while introducing nitrogen, calcining the raw material powder, cooling, introducing shielding gas atmosphere, calcining, and cooling in the furnace to obtain the calcined powder; and grinding the calcined powder, washing, drying and screening to obtain the vacuum ultraviolet excited green silicate fluorescent powder. On the premise of not increasing the concentration of Mn2+, the preparation method can prepare the green silicate fluorescent powder with good luminous performance and shorter persistence.

Description

technical field [0001] The invention belongs to the technical field of fluorescent powder manufacturing, and relates to a method for preparing fluorescent powder used in plasma flat panel displays, in particular to a method for preparing green silicate fluorescent powder excited by vacuum ultraviolet rays. Background technique [0002] At present, large-screen ultra-thin high-definition televisions (HDTVs) are increasingly favored by people, and most high-definition televisions use plasma flat panel displays (PDPs). Compared with the traditional cathode ray tube (CRT) display, PDP has the advantages of wide viewing angle, high brightness, good color reproduction, rich gray scale and fast response to rapidly changing pictures, etc., and PDP is easy to combine with large-scale integrated circuits. "Action", the structure is simpler, the process is convenient and easy, and it is very suitable for modern mass production. Therefore, PDP display has become the most promising larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/79
Inventor 王育华刘吉地刘碧桃李杰周峻卢阳华
Owner LANZHOU UNIVERSITY
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