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Nanometer hybridized phosphor in core-shell structure and its prepn process

A technology of nano-fluorescent powder and shell structure, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems of reducing the growth rate of complexes, low solubility, complex preparation process, etc., and achieves excellent application performance, high luminous intensity, single good color effect

Inactive Publication Date: 2007-11-07
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The doping amount of this method is not large, and some organic complexes with excellent photofunctional properties cannot be effectively introduced due to low solubility; the second is the in-situ synthesis method, that is, the formation of SiO 2 Although the viscosity of the sol-gel will reduce the growth rate of the complex, and the micropores in the gel act as nanoscale microreactors, it will prevent the crystal growth of the complex, thereby obtaining a stable SiO embedded in organic complex nanocrystals 2 Glass, but the preparation process of this method is complicated, the time is long, and it is difficult to industrialize

Method used

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  • Nanometer hybridized phosphor in core-shell structure and its prepn process
  • Nanometer hybridized phosphor in core-shell structure and its prepn process
  • Nanometer hybridized phosphor in core-shell structure and its prepn process

Examples

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Effect test

Embodiment 1

[0031] Add 15ml of ammonium terephthalate solution into a 100ml flask, slowly add 10ml of 0.1M EuCl dropwise under magnetic stirring 3 solution; react in a water bath at 60°C for 3 hours; centrifuge the product and wash it three times with absolute ethanol; dry at 80°C for 8 hours to obtain the europium-terephthalic acid rare earth complex.

[0032] Weigh 0.1 g of the prepared europium-terephthalic acid complex, put it into a flask filled with 20 ml of absolute ethanol, and disperse it ultrasonically for 25 min; add 2 ml of distilled water and 1.25 ml of 25% ammonia water, and stir magnetically for 30 min; Transfer to a constant temperature water bath at 30°C, add 0.5ml tetraethyl orthosilicate (TEOS) dropwise at a constant speed under magnetic stirring, and end the reaction after stirring for 4 hours; centrifuge the product, wash twice with absolute ethanol and distilled water; dry at 60°C After 4 hours, dry at 80°C for 8 hours to obtain a white powder, which is the product. ...

Embodiment 2

[0035] Add 15ml of ammonium terephthalate solution into a 100ml flask, slowly add 10ml of 0.1M EuCl dropwise under magnetic stirring 3 solution; react in a water bath at 40°C for 4h; centrifuge the product and wash it three times with absolute ethanol; dry at 100°C for 4h to obtain the europium-terephthalic acid rare earth complex.

[0036] Weigh 0.1 g of the prepared europium-terephthalic acid complex, put it into a flask filled with 20 ml of absolute ethanol, and disperse it ultrasonically for 30 min; add 3 ml of distilled water and 2.50 ml of 25% ammonia water, and stir magnetically for 30 min; transfer the flask to In a constant temperature water bath at 40°C, slowly add 3.0ml tetraethyl orthosilicate (TEOS) dropwise at a constant speed under magnetic stirring, and stop the reaction after stirring for 5 hours; centrifuge the product, wash with absolute ethanol and distilled water three times each; dry at 40°C for 6 hours Then dry at 100°C for 4 hours to obtain a white powd...

Embodiment 3

[0038] Add 15ml of ammonium terephthalate solution into a 100ml flask, slowly add 10ml of 0.1M EuCl dropwise under magnetic stirring 3 solution; react in a water bath at 80°C for 2h; centrifuge the product and wash it three times with absolute ethanol; dry at 60°C for 12h to obtain the europium-terephthalic acid rare earth complex.

[0039] Weigh 0.05 g of the prepared europium-terephthalic acid complex, put it into a flask filled with 20 ml of absolute ethanol, and disperse it ultrasonically for 45 min; add 2 ml of distilled water and 1.25 ml of 25% ammonia water, and stir magnetically for 45 min; transfer the flask to In a constant temperature water bath at 25°C, slowly add 0.5ml tetraethyl orthosilicate (TEOS) dropwise at a constant speed under magnetic stirring, and stop the reaction after stirring for 6 hours; centrifuge the product, wash with absolute ethanol and distilled water three times each; dry at 80°C for 2 hours Then dry at 60°C for 12 hours to obtain a white pow...

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Abstract

The present invention discloses one kind of nanometer hybridized phosphor in core-shell structure with complex of RE element and terephthalic acid as the core and SiO2 as the shell, and is especially red phosphor with complex of RE element Eu and terephthalic acid as the core and green phosphor with complex of RE element Tb and terephthalic acid as the core. The present invention also discloses the nanometer hybridized phosphor preparing sol-gel-wrapping process. The nanometer hybridized phosphor material has the features of light emitting RE complex, including high light emitting strength, high monochromaticity, vivid color, etc and the features of inorganic SiO2 material including high light, heat and chemical stability, and possesses excellent application performance.

Description

technical field [0001] The invention relates to a rare earth luminescent material and a preparation method thereof, in particular to a core (rare earth-terephthalic acid complex)-shell (SiO 2 ) structure hybrid nano-spherical fluorescent powder and a preparation method thereof. Background technique [0002] Although rare earth complexes have the characteristics of high luminous intensity, good monochromaticity, and bright colors, their potential application value has not been fully utilized because they are unstable to light and heat. Inorganic materials have good light, heat and chemical stability. If the two are combined, the stability of the rare earth complex may be improved, and the luminescent performance will be improved. Therefore, the development of rare earth hybrid luminescent materials has always been the focus of research. [0003] Due to the sol-gel method, tetraethyl orthosilicate [Si(OC 2 h 5 ) 4 , TEOS] SiO obtained by controlled hydrolysis and polycond...

Claims

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Application Information

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IPC IPC(8): C09K11/06
Inventor 杨良准沈新峰余锡宾
Owner SHANGHAI NORMAL UNIVERSITY
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