A kind of preparation method of silicate fluorescent powder with good stability

A phosphor and silicate technology, which is applied in chemical instruments and methods, luminescent materials, etc., can solve the problems such as the decline of the luminescence performance and use performance of phosphors, and achieve the effect of shortening the chemical reaction time, finer particles, and increasing the specific surface area.

Active Publication Date: 2018-05-29
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Subsequent pulverization process will cause a significant drop in phosphor luminescence performance and usability

Method used

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  • A kind of preparation method of silicate fluorescent powder with good stability
  • A kind of preparation method of silicate fluorescent powder with good stability
  • A kind of preparation method of silicate fluorescent powder with good stability

Examples

Experimental program
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Effect test

Embodiment 1

[0022] According to the general chemical formula Sr 2.94 SiO 5 : 0.06Eu 2+ Weigh first (C 2 h 5 ) 4 SiO 4 0.1mol and dissolve it in 100ml of water, add 1ml of ethanol and a few drops of nitric acid, then stir vigorously to make (C 2 h 5 ) 4 SiO 4 fully hydrolyzed and form a transparent, clear solution; then weigh Sr(NO 3 ) 2 4H 2 O(A.R.)0.294mol and Eu(NO 3 ) 3 ·6H 2 O (A.R.) 0.006mol, then respectively take by weighing 0.1wt% surfactant sodium dodecylbenzene sulfonate and chelating agent (ratio of reactant and chelating agent is 1: 2) of the above drug gross mass; Dissolve in water to make solution 2 of 1mol / L; then add solution 2 dropwise into vigorously stirred solution 1, and finally form a clear solution, then age at a constant temperature of 80°C, and finally place the formed gel on The precursor powder is obtained in an oven; after mixing the precursor powder and flux evenly, calcining in a reducing atmosphere provided by the combustion of activated carbo...

Embodiment 2

[0024] According to the general chemical formula Sr 2.90 Ca 0.04 SiO 5 : 0.06Eu 2+ Weigh first (C 2 h 5 ) 4 SiO 4 0.1mol and dissolve it in 100ml of water, add 1ml of ethanol and a few drops of nitric acid, then stir vigorously to make (C 2 h 5 ) 4 SiO 4 fully hydrolyzed and form a transparent, clear solution; then weigh Sr(NO 3 ) 2 (A.R.)0.29mol, Ca(NO 3 ) 2 4H 2 O(A.R.)0.29mol and Eu(NO 3 ) 3 ·6H 2 O (A.R.) 0.006mol, then respectively take by weighing 0.1wt% surfactant sodium dodecylbenzene sulfonate and chelating agent (ratio of reactant and chelating agent is 1: 2) of the above drug gross mass; Dissolve in water to make solution 2 of 1mol / L; then add solution 2 dropwise into vigorously stirred solution 1, and finally form a clear solution, then age at a constant temperature of 80°C, and finally place the formed gel on The precursor powder is obtained in an oven; after mixing the precursor powder and flux evenly, calcining in a reducing atmosphere provided...

Embodiment 3

[0026] According to the general chemical formula Sr 2.90 Mg 0.04 SiO 5 : 0.06Eu 2+ Weigh first (C 2 h 5 ) 4 SiO 4 0.1mol and dissolve it in 100ml of water, add 1ml of ethanol and a few drops of nitric acid, then stir vigorously to make (C 2 h 5 ) 4 SiO 4 fully hydrolyzed and form a transparent, clear solution; then weigh Sr(NO 3 ) 2 4H 2 O(A.R.)0.29mol, Mg(NO 3 ) 2 ·6H 2 O(A.R.)0.29mol and Eu(NO 3 ) 3 ·6H 2O (A.R.) 0.006mol, then respectively take by weighing 0.1wt% surfactant sodium dodecylbenzene sulfonate and chelating agent (ratio of reactant and chelating agent is 1: 2) of the above drug gross mass; Dissolve in water to make solution 2 of 1mol / L; then add solution 2 dropwise into vigorously stirred solution 1, and finally form a clear solution, then age at a constant temperature of 80°C, and finally place the formed gel on The precursor powder is obtained in an oven; after mixing the precursor powder and flux evenly, calcining in a reducing atmosphere p...

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Abstract

The invention provides a preparation method of silicate phosphor with good stability. The method includes the steps that corresponding alkali metal salt, tetraethoxysilane and europium nitrate are weighed according to the stoichiometric ratio of all elements; a surface active agent and cosolvent accounting for 0.1-2 wt% the total mass of the above-mentioned medicine are then weighed; tetraethoxysilane is subjected to full hydrolysis, then the alkali metal salt, europium nitrate, the surface active agent and a chelating agent are mixed in a water solution, and the molar ratio of the reactant to the chelating agent is 1: (2-6); then the two solutions are mixed and then fully stirred till a transparent and clear solution is formed, the solution is aged and then dried at the room temperature, precursor powder is obtained, the precursor powder is uniformly mixed with the cosolvent, calcination is conducted for 3-6 hours under a reduction atmosphere, the calcination temperature is 1100-1400 DEG C, and the required phosphor is obtained. The phosphor prepared through the method is wide in excitation wavelength, high in light-emitting strength, good in crystallinity, narrow in size distribution and suitable for serving as phosphor for white-light LEDs.

Description

[0001] The present invention is a divisional application with the application number 201210428667.2, the title of the invention is "A Synthesis Method of Silicate Orange-red Phosphor Powder for White LED", and the applicant is Chongqing University of Arts and Sciences. technical field [0002] The invention belongs to the technical field of luminescent materials, and in particular relates to a silicate orange-red fluorescent powder and a preparation method thereof. Background technique [0003] At present, it is a mainstream technical solution to realize white light LED, but it lacks red light components; the second is to use ultraviolet chips and phosphors that can be effectively excited by ultraviolet light to emit red, green, and blue primary colors to form white light LEDs; The red, green, and blue three-base LED chips are assembled to realize white light. However, there is a shortage of phosphors that can be effectively excited by near-ultraviolet light and blue light, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59
CPCC09K11/7734
Inventor 彭玲玲曹仕秀韩涛
Owner CHONGQING UNIV OF ARTS & SCI
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