Preparation method for silicate luminescent material

A technology of luminescent material and silicate, which is applied in the field of preparation of silicate luminescent material, and achieves the effects of high yield, simple preparation process and good product quality

Inactive Publication Date: 2012-08-01
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the above-mentioned inventions and relevant domestic and foreign literature reports relate to the preparation of silicate luminescent materials by the homogeneous precipitation method provided by the present invention.

Method used

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  • Preparation method for silicate luminescent material
  • Preparation method for silicate luminescent material
  • Preparation method for silicate luminescent material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] With Sr(NO 3 ) 2 (AR), Mg(NO 3 ) 2 ·6H 2 O (AR), C 8 h 20 o 4 Si (AR), Eu 2 o 3 (99.99%) and Dy 2 o 3 (99.99%) is the starting material, according to Sr 1.97 MgSi 2 o 7 :0.01Eu 2+ ,0.02Dy 3+ The stoichiometric ratio (C8 h 20 o 4 Si excess 5%) were accurately weighed. Will Eu 2 o 3 and Dy 2 o 3 Dissolve with concentrated nitric acid and dilute with water-ethanol mixture with a volume ratio of 2:1, then add Sr(NO 3 ) 2 , Mg(NO 3 ) 2 ·6H 2 O, C 8 h 20 o 4 Si, precipitant urea, stir to dissolve, the total concentration of metal ions is 0.5 mol / L, the amount of urea ( n 尿 , mol): cation content ( n 阳 , mol)=6 (cations refer to metal ions and silicon ions, the same below), transfer the mixed solution to a stainless steel reactor lined with polytetrafluoroethylene, the filling degree is 80%, and keep it at 95°C for 24h to obtain cations The precipitated slurry was centrifuged, the supernatant was discarded, washed with ethanol, vacuum dried ...

Embodiment 2

[0034] With Sr(CH 3 COO) 2 (AR), Mg(CH 3 COO) 2 4H 2 O (AR), C 8 h 20 o 4 Si (AR), Eu 2 o 3 (99.99%) and Dy 2 o 3 (99.99%) is the starting material, according to Sr 1.97 MgSi 2 o 7 :0.01Eu 2+ ,0.02Dy 3+ The stoichiometric ratio (C 8 h 20 o 4 Si excess 10%) were accurately weighed. Will Eu 2 o 3 and Dy 2 o 3 Dissolve with concentrated nitric acid and dilute with a water-ethanol mixture with a volume ratio of 1:1, then add Sr(CH 3 COO) 2 , Mg(CH 3 COO) 2 4H 2 O, C 8 h 20 o 4 Si, precipitant urea, template agent polyethylene glycol (molecular weight 2000), stirring to dissolve, the total concentration of metal ions is 0.5 mol / L, the amount of urea ( n 尿 , mol): cation content ( n 阳 , mol)=9, the amount of polyethylene glycol is 5wt% of the theoretical yield of the product. Transfer the mixed solution to a stainless steel reaction kettle lined with polytetrafluoroethylene, with a filling degree of 80%, and keep it warm at 105°C for 12 hours. W...

Embodiment 3

[0036] SrCO 3 (AR), MgO (AR), C 8 h 20 o 4 Si (AR), Eu 2 o 3 (99.99%) and Dy 2 o 3 (99.99%) is the starting material, according to Sr 1.97 MgSi 2 o 7 :0.01Eu 2+ ,0.02Dy 3+ The stoichiometric ratio (C 8 h 20 o 4 Si excess 8%) were accurately weighed. SrCO 3 , MgO, Eu 2 o 3 and Dy 2 o 3 Dissolve with concentrated nitric acid and dilute with a water-ethanol mixture with a volume ratio of 3:1, then add C 8 h 20 o 4 Si, precipitant urea, template agent β-cyclodextrin, stirred to dissolve, the total concentration of metal ions is 0.5 mol / L, the amount of urea ( n 尿 , mol): cation content ( n 阳 , mol)=12, the dosage of β-cyclodextrin is 3wt% of the theoretical yield of the product. Transfer the mixed solution to a polytetrafluoroethylene-lined stainless steel reaction kettle with a filling degree of 80%, and keep it at 95°C for 18 hours to obtain the precipitated slurry of cationic precipitates. Wash, dry in a vacuum oven at 100°C, and then calcinate for...

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Abstract

The invention relates to a preparation method for a silicate luminescent material, which comprises the following steps: 1), preparing a water-alcohol mixed liquor containing metal ions; 2), obtaining a mother liquor for homogeneous precipitation reaction; 3), obtaining a precipitation slurry containing cation sediment; 4), obtaining precipitation precursor powder; and 5), calcining the precipitation precursor powder obtained in the step 4 at 900 to 1400 DEG C for 1 to 12 h to obtain the luminescent material product. Compared with the prior art, the invention has the advantages that 1), the degree of uniformity is high, so that the quality of the product is high; 2) the appearance of the product is controllable; and 3), the preparation technology is simple, the reaction conditions are controllable, the maneuverability, the repeatability and the productivity are high, the requirements on equipment and energy are lower, and mass production can be carried out easily.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing a silicate luminescent material that can be used in the fields of fluorescent lamps, displays, light-emitting diodes, and light-storing materials. Background technique [0002] In recent years, many studies have focused on the improvement of brightness, electro-optical conversion efficiency, stability and resolution of lighting and display devices. Luminescent materials are key functional materials that convert electrical energy into light energy, and the improvement of their performance plays a vital role in the development of lighting and display devices. With the rapid development of technology, the focus of research on luminescent materials is no longer limited to their optical properties. Improving the luminous efficiency of luminescent materials from the aspect of physical properties has also attracted great attention, such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59
Inventor 张占辉黄志良陈力刘小军
Owner WUHAN INSTITUTE OF TECHNOLOGY
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