Fluorescent material with core-shell structure and preparation method thereof

A technology of fluorescent material and core-shell structure, which is applied in the field of core-shell structure fluorescent material and its preparation, and can solve the problems of weak luminescence performance and complex process of phosphor materials

Inactive Publication Date: 2011-09-21
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

[0003] At present, the preparation method of core-shell materials is mainly the sol-gel method, but the core-shell fluorescent materials prepared by the sol-gel method have the disadvantages of complex process and weak luminescent properties of the obtained phosphor materials.

Method used

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  • Fluorescent material with core-shell structure and preparation method thereof
  • Fluorescent material with core-shell structure and preparation method thereof
  • Fluorescent material with core-shell structure and preparation method thereof

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preparation example Construction

[0023] The method for preparing a fluorescent material with a core-shell structure according to an embodiment of the present invention comprises the following steps:

[0024] 1.SiO2 2 Preparation of microspheres:

[0025] 1.1 Add 1-20mL of deionized water, 15-50mL of absolute ethanol and 1-9mL of ammonia water into the Erlenmeyer flask, mix well under magnetic stirring, and then add dropwise 0.5-6mL of tetraethyl orthosilicate (TEOS) , after the dropwise addition is completed, continue to stir the reaction for 2 to 6 hours to obtain SiO 2 Microsphere precipitation;

[0026] 1.2 SiO obtained in the above step 1.1 2 The microsphere precipitation was centrifuged at a speed of 9000rpm to 14000rpm and washed three times with deionized water to remove the remaining ammonia and residual TEOS to obtain SiO 2 microsphere particles;

[0027] 1.3 SiO obtained in the above step 1.2 2 The microsphere particles were redispersed into 10-50mL deionized water by ultrasonic dispersion to ...

Embodiment 1

[0049] Preparation of silica microspheres: Place 1mL of deionized water, 15mL of absolute ethanol and 1mL of ammonia water in an Erlenmeyer flask, mix them evenly under magnetic stirring, and then add 0.5mL of ethyl orthosilicate dropwise Ester (TEOS), after the dropwise addition is completed, continue to stir the reaction for 2h to obtain SiO 2 microsphere suspension liquid; the resulting SiO 2 The microsphere suspension was centrifuged at 12000rpm and washed three times with deionized water to remove the remaining ammonia and residual TEOS to obtain SiO 2 microspheres; the resulting SiO 2 The microspheres were redispersed into deionized water by ultrasonic dispersion to obtain 10 mL of silica suspension, which was designated as A1.

[0050] SiO 2 @(Gd 0.98 , Eu 0.02 ) 2 o 3 Preparation of core-shell fluorescent materials: according to Gd(NO 3 ) 3 : Eu(NO 3 ) 3 The molar ratio of 0.98:0.02 weighs 1.774g Gd 2 o 3 and 0.0352gEu 2 o 3 , the Gd 2 o 3 and Eu 2 o ...

Embodiment 2

[0053] Preparation of silica microspheres: Mix 10mL of deionized water, 25mL of absolute ethanol and 4mL of ammonia water in an Erlenmeyer flask, mix them evenly under magnetic stirring, and then add 1mL of ethyl orthosilicate dropwise Ester (TEOS), after the dropwise addition is completed, continue to stir and react for 3h to obtain SiO 2 microsphere suspension liquid; the resulting SiO 2 The microsphere suspension was centrifuged at 9000rpm and washed three times with deionized water to remove the remaining ammonia and residual TEOS to obtain SiO 2 microspheres; the resulting SiO 2 The microspheres were redispersed into deionized water by ultrasonic dispersion to obtain 10 mL of silica suspension, which was designated as A2.

[0054] SiO 2 @(Gd 0.95 , Tb 0.05 ) 2 o 3 Preparation of core-shell fluorescent materials: according to Gd(NO 3 ) 3 : Tb(NO 3 ) 3 The molar ratio of 0.95:0.05 weighs 3.810g Gd 2 o 3 and 0.183gTb 2 o 3 , the Gd 2 o 3 and Tb 2 o 3 Disso...

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Abstract

The invention provides a fluorescent material with a core-shell structure. The structural formula of the fluorescent material is SiO2@ fluorescent powder, wherein @ means SiO2 serving as a core is covered by fluorescent powder serving as a shell. The preparation method of the fluorescent material comprises the following steps: preparation of SiO2 micro-suspension, preparation of SiO2@oxalate and preparation of SiO2@ fluorescent powder. In the invention, silicon dioxide microspheres serve as cores and a precipitator is dripped to coat a fluorescent powder layer on the surface of silicon dioxide; and thus, the preparation process of the fluorescent material is simple, the requirement on the equipment is low, the preparation period is short, and the cost is low. Meanwhile, the fluorescent material preparation by the invention is uniform in particle size and shape; and thus, the bulk density of the particles is high, the luminous intensity, luminous efficiency and resolution of the particles are improved, and the light scattering of the fluorescent powder is reduced.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a fluorescent material with a core-shell structure and a preparation method thereof. Background technique [0002] The morphology of phosphor powder has a great influence on its luminous intensity, luminous efficiency and resolution. Spherical phosphor particles have a large specific surface area, so they are most likely to absorb external excitation. At the same time, spherical particles can obtain a large packing density, and have the strongest emission effect on the light emitted by themselves in all directions, so that they can Reduce the light scattering of the phosphor, so compared with other shapes, the spherical phosphor particles can greatly improve the luminous intensity, luminous efficiency and resolution of the phosphor. For the preparation of spherical fluorescent materials, the design concept and preparation technology of core-shell struct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/79
Inventor 周明杰陆树新马文波
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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