Hydro-thermal preparation method for spherical boric acid yttrium doped europium fluorescent powder in hollow structure

A hollow structure and fluorescent powder technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as difficult spherical structures, and achieve the effect of facilitating transfer, meeting light weight requirements, and uniform luminous effect in all directions

Inactive Publication Date: 2012-01-25
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in terms of the crystallization characteristics of borate, it is very easy to undergo anisotropic growth to form a two-dimensional sheet structure, and it is not easy to form a regular spherical structure.

Method used

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  • Hydro-thermal preparation method for spherical boric acid yttrium doped europium fluorescent powder in hollow structure
  • Hydro-thermal preparation method for spherical boric acid yttrium doped europium fluorescent powder in hollow structure
  • Hydro-thermal preparation method for spherical boric acid yttrium doped europium fluorescent powder in hollow structure

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preparation example Construction

[0028] The preparation embodiment of nucleating reagent:

[0029] Configure glucose into a 0.5 mol / liter solution, take 80 milliliters of the solution and put it into a 100 milliliter reactor for hydrothermal reaction, the hydrothermal reaction temperature is 160°C, and the hydrothermal reaction time is 12 hours; after the reaction, the product obtained is centrifuged, and then Wash three times with ethanol, then wash three times with deionized water, put the prepared carbon spheres into a nitric acid solution with a volume ratio of nitric acid and deionized water of 1:5 for ultrasonic dispersion, soak at room temperature for 10 hours, wash with water until neutral, and collect by centrifugation , and dry to obtain carbon spheres with a diameter of 1-5 microns. Add 10.0 mL of deionized water to the obtained carbon spheres to form a suspension, and sonicate for 15 to 30 minutes. is the nucleating reagent.

Embodiment 1

[0031] Dissolve 0.7280 g of yttrium nitrate hexahydrate in 19.0 mL of deionized water; dissolve 0.0446 g of europium nitrate hexahydrate in 1.0 mL of deionized water; dissolve 0.1200 g of boric acid in 20.0 mL of deionized water. Stir separately to obtain a homogeneous solution, the concentrations of yttrium ion, europium ion and boric acid are all 0.1 mol / L. The above three solutions are mixed, and in the mixed solution, the molar concentration ratio of yttrium ion, europium ion and boric acid is 19:1:20. The mixed solution was stirred for 15 minutes. Add 4.0 mL of nucleating reagent followed by 0.3100 g of malonic acid. After the pH of the solution was stabilized, the pH of the solution was adjusted to 9.0 with 2.0 mol / L ammonia water. The above solution was transferred into a 100mL reactor for hydrothermal reaction, the hydrothermal temperature was 220°C, and the hydrothermal time was 24 hours. After the hydrothermal reaction, the obtained product is centrifuged and drie...

Embodiment 2

[0033] Dissolve 7.2800g of yttrium nitrate hexahydrate in 19.0mL of deionized water; dissolve 0.4460g of europium nitrate hexahydrate in 1.0mL of deionized water; dissolve 1.2000g of boric acid in 20.0mL of deionized water. Stir separately to obtain a homogeneous solution, the concentrations of yttrium ion, europium ion and boric acid are all 1.0 mol / liter. The above three solutions are mixed, and in the mixed solution, the molar concentration ratio of yttrium ion, europium ion and boric acid is 19:1:20. The mixed solution was stirred for 15 minutes. Add 8.0 mL of nucleating reagent, and then add 3.1000 g of malonic acid, and after stirring for 15 minutes, adjust the pH of the solution to 10.0 with 2.0 mol / liter of ammonia water. The above solution was transferred into a 100mL reactor for hydrothermal reaction, the hydrothermal temperature was 160°C, and the hydrothermal time was 48 hours. After the hydrothermal reaction, the obtained product is centrifuged and dried to obta...

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Abstract

The invention discloses a hydro-thermal preparation method for spherical boric acid yttrium doped europium fluorescent powder in a hollow structure. 0.01 to 1.0 mole/liter yttrium ions, europium ions and boric acid are mixed, the mole ratio of the yttrium ions to the europium ions to the boric acid in the mixed solution is 19/1/20, organic topography induction reagents are added into the mixed solution, the ratio of the mol number of the added organic topography induction reagents to the sum of the mol number of the yttrium ions and the europium ions is 3/2, 1 to 8 milliliters of nucleating reagents are added into the mixed solution, and suspending liquid is obtained; the alkali liquor is used for regulating the pH to be 8 to 10; the suspending liquid is moved into a 100mL reaction kettlefor carrying out hydrothermal reaction; and the heat treatment is carried out on powder products after the hydrothermal reaction, and the spherical fluorescent powder in the hollow structure is obtained. The spherical boric acid yttrium doped europium fluorescent powder has the smaller specific gravity because of the adoption of the hollow structure, and requirements of luminescent devices on light weight of fluorescent luminescent materials can be met.

Description

technical field [0001] The invention relates to a hydrothermal preparation method of a spherical fluorescent powder, in particular to a hydrothermal preparation method of a hollow-structured spherical fluorescent powder doped with yttrium borate and europium. Background technique [0002] Due to the characteristics of large internal space, large specific surface area and low density, the hollow structure has great potential application prospects in many fields such as catalyst drug slow release and controlled release and chromatographic separation. Therefore, the study of hollow structures has always been one of the research hotspots in the field of materials and chemistry. As far as we know, there are still relatively few studies on hollow structure phosphors, especially rare earth borate phosphors with hollow structures. [0003] Rare earth borates have become an important aspect in the research of luminescent materials due to their stable physical and chemical properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
Inventor 金达莱缪翔曾红春王龙成杜平凡席珍强
Owner ZHEJIANG SCI-TECH UNIV
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