Short-afterglow zinc-manganese silicate green fluorescent powder and its preparing method

Abstract

The invented fluorescent powder is obtained by using metal nitrate-organics combustion method through synthesis process, and its component is Zn2-2xSiO4:2xMn, X=0.0025-0.075; As compared with similarmanganese zinc silicate fluorescent powder synthesized by traditional method its fluorescent life is reduced to 4-8 ms from above 10 ms to eliminate the double-image effect of long after-glow, and its production process is simple, and said invented fluorescent powder is suitable for plasma display or cathode-ray display.

Description

technical field

[0001] The invention relates to a manganese ion-doped zinc silicate (zinc-manganese silicate) green luminescent fluorescent powder suitable for short afterglow for display and a preparation method thereof. Background technique

[0002] There have been many years of research on the traditional synthesis of zinc-manganese silicate green luminescent phosphors. At present, its main synthesis methods are high-temperature solid-phase method and sol-gel method. The former is directly mixed with solid raw materials zinc oxide, manganese oxide and silicon dioxide, adding an appropriate amount of fluxing agent amine fluoride, and sintering and synthesizing at a high temperature of 1200 degrees Celsius or above. The latter uses ethyl orthosilicate, zinc ions, and manganese ions as raw materials. After sol and gel processes, zinc ions and manganese ions are evenly dispersed in the gel network, and zinc silicate is obtained through proper sintering at a high temperature o...

Examples

Embodiment 1

[0024]First prepare nano silicon dioxide containing manganese ions: use tetraethoxysilane (orthosilicate) as starting raw material, according to the formula Zn 2-2x SiO 4 : the ratio of 2xMn, the ratio of silicon component and manganese component is 1: 2x molar ratio, in the present embodiment, x=0.005; Earlier tetraethoxysilane, manganese nitrate solution, deionized water and 95% (V / V) ethanol is mixed and mixed evenly with a mixer, then heated in a water bath at 60 degrees Celsius to form a sol, and gradually transform into a gel as time goes by, and the gel is ground into powder after being dried at 100 degrees Celsius, and the obtained dry coagulation The rubber powder is heat-treated at 400 degrees Celsius to obtain an amorphous nano-silica material with a particle size of about 5 nanometers and manganese ions evenly distributed in it; the amount of deionized water is subject to the complete hydrolysis of tetraethoxysilane, and the amount of alcohol Tetraethoxysilane:al...

Embodiment 2

[0033] With reference to embodiment 1, wherein:

[0034] In the preparation of the amorphous nano-silica suspension containing manganese ions, the ratio of the silicon component to the manganese component is 1: 2x molar ratio, x=0.01;

[0035] In the preparation of solution 1, the consumption of the suspension of amorphous nano silicon dioxide is measured by the molar ratio of 1: 0.01 by the ratio of zinc: manganese;

[0036] In the preparation of solution 2, the consumption of aqueous urea solution is metered (about 200 milliliters) by the mol ratio of urea: nitrate=2.5:5;

[0037] Other conditions are identical with embodiment 1.

[0038] Finally, the product 2 is obtained with a grayish black color. It shows that the reaction temperature is too high and the oxidizing property of the flame atmosphere is too strong, a small amount of manganese ions are oxidized, and the valence state changes.

[0039] Product 2 was subjected to X-ray diffraction analysis, and the same resu...

technical field

[0001] The invention relates to a manganese ion-doped zinc silicate (zinc-manganese silicate) green luminescent fluorescent powder suitable for short afterglow for display and a preparation method thereof. Background technique

[0002] There have been many years of research on the traditional synthesis of zinc-manganese silicate green luminescent phosphors. At present, its main synthesis methods are high-temperature solid-phase method and sol-gel method. The former is directly mixed with solid raw materials zinc oxide, manganese oxide and silicon dioxide, adding an appropriate amount of fluxing agent amine fluoride, and sintering and synthesizing at a high temperature of 1200 degrees Celsius or above. The latter uses ethyl orthosilicate, zinc ions, and manganese ions as raw materials. After sol and gel processes, zinc ions and manganese ions are evenly dispersed in the gel network, and zinc silicate is obtained through proper sintering at a high temperature o...

Examples

Embodiment 1

[0024]First prepare nano silicon dioxide containing manganese ions: use tetraethoxysilane (orthosilicate) as starting raw material, according to the formula Zn 2-2x SiO 4 : the ratio of 2xMn, the ratio of silicon component and manganese component is 1: 2x molar ratio, in the present embodiment, x=0.005; Earlier tetraethoxysilane, manganese nitrate solution, deionized water and 95% (V / V) ethanol is mixed and mixed evenly with a mixer, then heated in a water bath at 60 degrees Celsius to form a sol, and gradually transform into a gel as time goes by, and the gel is ground into powder after being dried at 100 degrees Celsius, and the obtained dry coagulation The rubber powder is heat-treated at 400 degrees Celsius to obtain an amorphous nano-silica material with a particle size of about 5 nanometers and manganese ions evenly distributed in it; the amount of deionized water is subject to the complete hydrolysis of tetraethoxysilane, and the amount of alcohol Tetraethoxysilane:al...

Embodiment 2

[0033] With reference to embodiment 1, wherein:

[0034] In the preparation of the amorphous nano-silica suspension containing manganese ions, the ratio of the silicon component to the manganese component is 1: 2x molar ratio, x=0.01;

[0035] In the preparation of solution 1, the consumption of the suspension of amorphous nano silicon dioxide is measured by the molar ratio of 1: 0.01 by the ratio of zinc: manganese;

[0036] In the preparation of solution 2, the consumption of aqueous urea solution is metered (about 200 milliliters) by the mol ratio of urea: nitrate=2.5:5;

[0037] Other conditions are identical with embodiment 1.

[0038] Finally, the product 2 is obtained with a grayish black color. It shows that the reaction temperature is too high and the oxidizing property of the flame atmosphere is too strong, a small amount of manganese ions are oxidized, and the valence state changes.

[0039] Product 2 was subjected to X-ray diffraction analysis, and the same resu...

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