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Preparation of manganese-doped willemite yellow fluorescent powder

A yellow phosphor, manganese zinc silicate technology, applied in the field of phosphors, can solve the problems of particle agglomeration, affecting the fluorescence efficiency, non-uniformity, etc., and achieve the effects of stable chemical properties, low reaction temperature, and uniform distribution

Inactive Publication Date: 2010-10-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method (1) requires higher temperature, the phosphor powder thus obtained is prone to sintering, particle agglomeration, large particle size and unevenness
Crushing, ball milling and other processes before use may damage the surface state of the phosphor powder and affect the fluorescence efficiency
In addition, if the raw materials are mixed in a solid state, it is easy to cause the aggregation of dopant ions and lead to self-absorption quenching
The above method (2) takes a long time, and the purity of its yellow phosphor is often affected by the quenching speed, and it is easy to introduce a green fluorescent phase.

Method used

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  • Preparation of manganese-doped willemite yellow fluorescent powder
  • Preparation of manganese-doped willemite yellow fluorescent powder
  • Preparation of manganese-doped willemite yellow fluorescent powder

Examples

Experimental program
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Effect test

Embodiment 1

[0024] (1) Zinc nitrate, manganese chloride and sodium hydroxide are prepared into 1mol / L, 1mol / L and 2mol / L aqueous solutions respectively with deionized water. (2) Calculated on the basis of 1 mmol of silicon dioxide, according to Zn 1.94 SiO 4 :Mn 0.06 Stoichiometric ratio Weigh silica and measure zinc nitrate and manganese chloride solutions. Zinc nitrate solution, manganese chloride solution, silicon dioxide and ethylene glycol are ultrasonically mixed, and then dropwise added hydrazine hydrate and sodium hydroxide solution, wherein the molar ratio of sodium hydroxide, hydrazine hydrate and zinc nitrate is 3:10: 2. The amount of ethylene glycol and aqueous solution is added at a ratio of 4:1, and the above mixture is further ultrasonically dispersed to form a suspension solution. (3) The suspension was transferred to a reactor and heated at 200°C for 72h. After cooling, wash with water and ethanol, and dry in air. Obtain yellow phosphor Zn 1.94 SiO 4 :Mn 0.06 . T...

Embodiment 2

[0026] (1) Zinc nitrate, manganese chloride and sodium hydroxide are prepared into 1mol / L, 1mol / L and 2mol / L aqueous solutions respectively with deionized water. (2) Calculated on the basis of 1 mmol of silicon dioxide, according to Zn 1.86 SiO 4 :Mn 0.14 Stoichiometric ratio Weigh silica and measure zinc nitrate and manganese chloride solutions. Zinc nitrate solution, manganese chloride solution, silicon dioxide and ethylene glycol are ultrasonically mixed, and then dropwise added hydrazine hydrate and sodium hydroxide solution, wherein the molar ratio of sodium hydroxide, hydrazine hydrate and zinc nitrate is 3:10: 2. The amount of ethylene glycol and aqueous solution is added at a ratio of 4:1, and the above mixture is further ultrasonically dispersed to form a suspension solution. (3) The suspension was transferred to a reactor and heated at 200°C for 72h. After cooling, wash with water and ethanol, and dry in air. Obtain yellow phosphor Zn 1.86 SiO 4 :Mn 0.14 . T...

Embodiment 3

[0028] (1) Zinc nitrate, manganese chloride and sodium hydroxide are prepared into 1mol / L, 1mol / L and 2mol / L aqueous solutions respectively with deionized water. (2) Calculated on the basis of 1 mmol of silicon dioxide, according to Zn 1.80 SiO 4 :Mn 0.20 Stoichiometric ratio Weigh silica and measure zinc nitrate and manganese chloride solutions. Zinc nitrate solution, manganese chloride solution, silicon dioxide and ethylene glycol are ultrasonically mixed, and then dropwise added hydrazine hydrate and sodium hydroxide solution, wherein the molar ratio of sodium hydroxide, hydrazine hydrate and zinc nitrate is 3:10: 2. The amount of ethylene glycol and aqueous solution is added at a ratio of 4:1, and the above mixture is further ultrasonically dispersed to form a suspension solution. (3) The suspension was transferred to a reactor and heated at 200°C for 72h. After cooling, wash with water and ethanol, and dry in air. Obtain yellow phosphor Zn 1.80 SiO4 :Mn 0.20 . The...

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Abstract

The invention relates to a preparation method for yellow fluorescent powder doped with manganese zinc silicate. The invention relates to a fluorescent powder, in particular to a method for preparing the yellow fluorescent powder doped with the manganese zinc silicate through the thermal reaction of low-temperature mixed solvent. The invention provides the method for preparing the yellow fluorescent powder doped with the manganese zinc silicate. The prepared yellow fluorescent powder doped with the manganese zinc silicate is characterized by small and even grain size, large specific surface area, stable performance, and the like. The chemical general expression is Zn2-xMnxSiO4, wherein x is more than or equal to 0.01 and less than or equal to 0.10. The method comprises the following steps:preparing an aqueous solution of zinc salt, manganese salt and sodium hydroxide; weighing nanometer silicon dioxide powder and the solution of zinc salt and manganese salt according to the stoichiometric ratio in the chemical general expression Zn2-xMnxSiO4, adding organic solvent, hydrazine hydrate and sodium hydroxide solution, and then dispersing the solution into suspension through ultrasonicwave; placing the suspension in a reaction kettle for reaction, and obtaining the yellow fluorescent powder doped with the manganese zinc silicate.

Description

technical field [0001] The present invention relates to a fluorescent powder, in particular to a method of preparing manganese-doped zinc silicate (Zn 2 SiO 4 :Mn) method of yellow phosphor. Background technique [0002] Zinc silicate (Zn 2 SiO 4 ) exist in different crystal structures, such as α-Zn 2 SiO 4 (JCPDS powder diffraction standard card number: 08-0492) is a hexagonal phase, and its unit cell parameter a=b=13.9381 c=9.3100 γ=120°; β-Zn 2 SiO 4 (JCPDS powder diffraction standard card number: 19-1479) is a triclinic phase, and its unit cell parameter a=5.100 b=9.9400 c=15.9000 and α=89.99°, β=96.98°, γ=119.30°. Zinc silicates with different crystal structures have different fluorescence properties after doping. Manganese-doped zinc silicate (Zn 2 SiO 4 :Mn) Its main peak of fluorescence emission spectrum is at 525nm. As a green phosphor, it has the advantages of stable performance, high luminous efficiency and pure color. It is widely used in many...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/20C09K11/59
Inventor 蒋亚琪李方方谢兆雄
Owner XIAMEN UNIV
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