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Fluorescent material and preparation method thereof

A fluorescent material and fluorescent powder technology, applied in the field of fluorescent materials, can solve the problems of poor conductivity, fluorescent powder conductivity and luminous performance weakening, etc.

Inactive Publication Date: 2011-01-05
OCEANS KING LIGHTING SCI&TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as far as the phosphor powders for FED and CRT are concerned, since the conductivity of silicon dioxide is too poor, the conductivity and luminescence performance of the phosphor powder will be correspondingly weakened after the silicon dioxide is coated on the surface of the phosphor powder.

Method used

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  • Fluorescent material and preparation method thereof
  • Fluorescent material and preparation method thereof
  • Fluorescent material and preparation method thereof

Examples

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preparation example Construction

[0022] The preparation process of the fluorescent material in this embodiment includes the following steps:

[0023] (1) Preparation of a sol containing metal nanoparticles:

[0024] (1) With water or ethanol as solvent, silver nitrate (AgNO 3 ), chloroauric acid (HAuCl 4 4H 2 O), chloroplatinic acid (H 2 PtCl 6 ·6H 2 O), palladium chloride (PdCl 2 2H 2 O) as a solute, preparing an oxidizing agent solution containing metal nanoparticles;

[0025] (2) Using water or absolute ethanol as a solvent, and reducing agents such as hydrazine hydrate, ascorbic acid, and sodium borohydride as solutes, a reducing agent solution is prepared;

[0026] (3) Under the state of magnetic stirring, one or more auxiliary agents are dissolved in the oxidant solution obtained in the above 11), and the content of the auxiliary agent in the finally obtained sol containing metal nanoparticles is 5 ×10 -4 g / mL~3×10 -3 g / mL, preferred additives are polyvinylpyrrolidone (PVP), sodium citrate, c...

Embodiment 1

[0039] Containing the sol preparation of Pt nanoparticle: take by weighing 5.18mg chloroplatinic acid (H 2PtCl 6 ·6H 2 O) be dissolved in the deionized water of 15.2mL; After chloroplatinic acid dissolves completely, take by weighing 8.0mg sodium citrate and 12.0mg sodium dodecylsulfonate, and dissolve into chloroplatinic acid aqueous solution under the environment of magnetic stirring Medium; Weigh 3.8mg of sodium borohydride and dissolve it in 10mL of deionized water to obtain a concentration of 1×10 in 10mL -2 mol / L sodium borohydride aqueous solution; under the environment of magnetic stirring, the ratio of the amount of the reducing agent to the metal ion substance is 4.8:1, add 4.8mL sodium borohydride aqueous solution dropwise to the chloroplatinic acid aqueous solution, and then continue Reaction for 45min, the content of 20mL Pt is 5×10 -4 mol / L sol containing Pt nanoparticles.

[0040] According to the ratio of absolute ethanol: deionized water of 1:5 (volume rat...

Embodiment 2

[0042] Sol preparation containing Ag nanoparticles: weigh 17.0 mg silver nitrate (AgNO 3 ) into 17.4mL of deionized water; when the silver nitrate was completely dissolved, weigh 60mg of sodium citrate, and dissolve it in the silver nitrate aqueous solution under the environment of magnetic stirring; 10 -2 mol / L hydrazine hydrate solution; under the environment of magnetic stirring, according to the ratio of reducing agent to metal ion substance amount of 0.5:1, add 1mL5×10 -2 mol / L hydrazine hydrate solution, and then continue to react for 30min to obtain 20mL Ag content of 5×10 -3 mol / L sol containing Ag nanoparticles.

[0043] According to the ratio of absolute ethanol: deionized water of 1:3 (volume ratio), measure 9.5mL of absolute ethanol and 28.5mL of deionized water in a beaker to prepare an alcohol-water mixture, and adjust the pH value of the mixture with nitric acid 5; Weigh 10g of gadolinium oxide europium phosphor, according to SiO 2 Accounting for 1% of the m...

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Abstract

The invention relates to a fluorescent material comprising a fluorescent powder body, SiO2 and metal nanoparticles, wherein the SiO2 is coated outside the fluorescent powder body; and the metal nanoparticles are doped in the SiO2. The fluorescent material has a composition general formula as follows: fluorescent powder body@ (SiO2: Mx), wherein @ expresses coating; the SiO2 accounts for 0.5-0.6 percent of the mass of the fluorescent powder body; M is at least one of Ag, Au, Pt and Pd; and x is the mole ratio of M and SiO2 and is more than or equal to 1.0*10-6 and less than or equal to 6.0*10-3. The obtained fluorescent material not only has good electrical conductivity and luminescent property by doping the conductive metal nanoparticles into SiO2 coating layers; and in addition, the invention not only lowers the zeta potential isoelectric points and prevents the agglomeration of fluorescent powder, but also realizes the protection of the fluorescent powder and enhances the ageing resistant property of the fluorescent powder due to SiO2 coating. Besides, the invention also discloses a preparation method of the fluorescent material.

Description

【Technical field】 [0001] The invention relates to a fluorescent material, in particular to a SiO doped with metal nanoparticles 2 Coated fluorescent material and preparation method thereof. 【Background technique】 [0002] Luminescent materials are widely used in the fields of display, imaging, light source, x-ray intensifying screen, detection and recording of nuclear physics and radiation fields, and various photography techniques of medical radiology images. The application of luminescent materials is of great significance, especially in the aspects of display, imaging and light sources that involve thousands of households and the national economy. [0003] Due to external factors and the factors of the luminescent material itself, the untreated luminescent material often has the phenomenon of powder agglomeration and unstable surface electrical properties. In addition to being affected by the phosphor itself, the service life of the phosphor is also affected by external...

Claims

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Application Information

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IPC IPC(8): C09K11/87C09K11/79
Inventor 周明杰陆树新马文波
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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