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Silicate luminescent material and preparation method thereof

A technology of luminescent materials and silicates, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of uneven morphology of luminescent powder, damage to luminous intensity of luminescent powder, and poor luminous performance of core-shell materials, etc., to achieve Facilitate the screen coating process, improve the display effect, and broaden the prospects for production and application

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

[0002] Most of the current commercial luminescent materials are prepared by high-temperature solid-phase method. The morphology of the obtained luminescent powder is not uniform, and repeated ball milling is required to obtain an appropriate particle size (5-10 μm). The defects and impurities introduced during the ball milling process Sometimes damages the luminous intensity of the glow powder
[0003] There are existing studies on applying the concept of core-shell materials to phosphorescent materials. However, the luminescence performance of the core-shell materials prepared so far is not very good, and needs to be improved.

Method used

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  • Silicate luminescent material and preparation method thereof

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preparation example Construction

[0021] The preparation method of the silicate luminescent material of the present invention comprises the following steps:

[0022] Dissolve the metal salt of Ag, Au, Pt, Pd or Cu in ethanol or water, dilute it into the metal salt solution, add additives and reducing agents to the metal salt solution under the condition of magnetic stirring, mix and react 10min~45min to prepare metal nanoparticle colloid;

[0023] Add the metal nanoparticle colloid prepared in the previous step into the solution of PVP, and after surface treatment of the metal nanoparticle, use Method to prepare metal nanoparticles as the core, SiO 2 SiO as the shell 2 nanospheres; again

[0024] According to the structural formula Ln 2-x SiO 5 :Tb x @SiO 2 Add Ln salt solution and Tb salt solution to the stoichiometric ratio of corresponding elements in @M, mix evenly and add oxalic acid solution dropwise to form a white precipitate, then adjust the pH value of the reaction system to weak alkaline wit...

Embodiment 1

[0033] Preparation of Gd by Co-precipitation Coating Method 1.95 SiO 5 :Tb 0.05 @SiO 2 @Au:

[0034] Weigh 7.6 mg of sodium borohydride and dissolve it in 10 mL of ethanol to obtain 10 mL of sodium borohydride alcohol solution with a concentration of 0.02 mol / L for future use. Weigh 16.4mg of chloroauric acid and dissolve it in 7.5mL of ethanol. After it is completely dissolved, add 56mg of sodium citrate and 24mg of cetyltrimethylammonium bromide under stirring, and add to the mixed solution under magnetic stirring. Add 2.5mL of the above-prepared sodium borohydride alcohol solution to the mixture, and continue the reaction for 30min to obtain an Au content of 4×10 -3 mol / L Au nanoparticle sol. Weigh 1g of PVP and dissolve it in 5mL of deionized water, then add 5mL of the above-prepared Au metal nanoparticle sol to it, stir for 24h, then add 30mL of absolute ethanol, 5mL of ammonia water, 1.5mL of tetraethylorthosilicate ester, after reacting for 6h, add 2mol / L of Gd(NO...

Embodiment 2

[0036] Co-precipitation coating method to prepare Y 1.92 SiO 5 :Tb 0.08 @SiO 2 @Ag:

[0037] Weigh 3.4 mg of silver nitrate and 35.28 mg of sodium citrate, dissolve them in 18.4 mL of deionized water, stir for 1.5 min, and then slowly drop in 0.01 mol / L hydroboration solution obtained by dissolving 3.8 mg of sodium borohydride into 10 mL of ethanol Sodium alcohol solution 1.6mL, continue to stir and react for 2min to obtain 1×10 -3 mol / L of Ag nanoparticles sol. Weigh 0.1g of PVP and dissolve it in 7mL of deionized water. After dissolving, add 3mL of the above-prepared Ag metal nanoparticle colloid to it, stir for 12h, then add 25mL of absolute ethanol, 6mL of ammonia, and 1.0mL of orthosilicon acid tetraethyl ester; after reacting for 6h, add 1mol / L of Y(NO 3 ) 3 7.6mL and 0.05mol / L Tb(NO 3 ) 3 6.4mL solution, after stirring evenly, then dropwise add 15mL of 1mol / L oxalic acid solution to form a white precipitate, then adjust the pH value to 8~9 with ammonia water, t...

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Abstract

The invention provides a silicate luminescent material, which has a structural formula of Ln2-xSiO5:Tbx@SiO2@M, wherein Ln is a rare earth element, @ represents cladding, that is to say, a metal nanoparticles is taken as a nucleus, spherical SiO2 is taken as an intermediate-layer shell, and fluorescent powder Ln2-xSiO5:Tbx is taken as an outer-layer shell; and M is one of Ag, Au, Pt, Pd, Cu metalnanoparticles, and a value of x is more than 0 and not more than 0.5. The invention also provides a preparation method of the luminescent material, which comprises the following steps of: preparing ametal nanoparticle colloid, preparing a SiO2 nano sphere, preparing a precursor, finally performing thermal treatment and reduction treatment on the precursor, and cooling to obtain a finished product. In the invention, the nucleus and the shell are formed through cladding the metal particles, so that the internal quantum efficiency, the stability and the luminescent efficiency of the silicate luminescent material are improved, the luminescent intensity of the silicate luminescent material is strengthened, thus the silicate luminescent material provided by the invention has broad production and application prospects.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a silicate luminescent material containing metal nanoparticles and a preparation method thereof. Background technique [0002] Most of the current commercial luminescent materials are prepared by high-temperature solid-phase method. The morphology of the obtained luminescent powder is not uniform, and repeated ball milling is required to obtain an appropriate particle size (5-10 μm). The defects and impurities introduced during the ball milling process Sometimes it will damage the luminous intensity of the luminous powder. [0003] There are existing researches on applying the concept of core-shell materials to phosphors, but the luminescence performance of the core-shell materials prepared so far is not very good and needs to be improved. Contents of the invention [0004] In view of this, the invention provides a silicate luminescent material with s...

Claims

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Application Information

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IPC IPC(8): C09K11/79
Inventor 周明杰马文波王荣时朝璞
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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