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Eu<3+>-activated silicate-based red phosphor powder and preparation method thereof

A technology of red fluorescent powder and silicate, which is applied in chemical instruments and methods, luminescent materials, nanotechnology for materials and surface science, etc., to achieve the effects of low energy consumption, saving production costs, and low prices

Active Publication Date: 2018-11-30
HENAN INST OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to literature research, there is no report on silicate-based phosphors with this structure

Method used

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  • Eu&lt;3+&gt;-activated silicate-based red phosphor powder and preparation method thereof
  • Eu&lt;3+&gt;-activated silicate-based red phosphor powder and preparation method thereof
  • Eu&lt;3+&gt;-activated silicate-based red phosphor powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] According to chemical formula Li 2 Ca 1.97 Eu 0.03 Si 5 o 13 The stoichiometric ratio of Li, Ca, and Eu elements in Li, respectively weighed lithium carbonate Li 2 CO 3 : 0.2803 g, calcium carbonate CaCO 3 : 0.7480 g, europium oxide Eu 2 o 3 : 0.0200 g, add dilute nitric acid solution, stir continuously until dissolved, then add citric acid: 9.5663 g to the solution, stir continuously, mix well, and obtain A solution; weigh ethyl orthosilicate: 3.9516 g, add appropriate amount of anhydrous Ethanol, stirred until completely dissolved to obtain solution B; mix solution A and solution B, and keep stirring in a water bath environment at 70°C until the solution becomes viscous and finally forms a transparent colloid; place the obtained colloid in In the oven, the temperature is 100°C, the time is 12 hours, aging and drying to obtain the precursor; the precursor is placed in the muffle furnace and calcined in the air atmosphere, the temperature is 400°C, the holding t...

Embodiment 2

[0027] According to chemical formula Li 2 Ca 1.999 Eu 0.001 Si 5 o 13 The stoichiometric ratio of Li, Ca, and Eu elements in Li, Ca, and Eu were weighed respectively as lithium nitrate LiNO 3 : 0.5192 grams, calcium hydroxide Ca(OH) 2 : 0.5576 g, europium nitrate Eu (NO 3 ) 3 ·6H 2O: 0.0017g, add dilute nitric acid solution, stir continuously until dissolved, then add oxalic acid: 4.0673g to the solution, stir continuously, mix well to obtain A solution; weigh ethyl orthosilicate: 3.9215g, add appropriate amount of anhydrous Ethanol, stirred until completely dissolved to obtain solution B; mix solution A and solution B, and keep stirring in a water bath environment at 60°C until the solution becomes viscous and finally forms a transparent colloid; place the obtained colloid in In the oven, the temperature is 90°C, the time is 12 hours, aging and drying to obtain the precursor; the precursor is placed in the muffle furnace and calcined in the air atmosphere, the tempera...

Embodiment 3

[0030] According to chemical formula Li 2 Ca 1.8 Eu 0.2 Si 5 o 13 For the stoichiometric ratio of Li, Ca, and Eu elements in Li, respectively weigh lithium hydroxide LiOH: 0.1686 g, calcium nitrate Ca (NO 3 ) 2 : 1.0399 g, europium oxide Eu 2 o 3 : 0.1239 grams, add dilute nitric acid solution, stir continuously until dissolved, then add 8.8786 grams of citric acid to the solution, stir continuously, mix evenly, and obtain A solution; weigh ethyl orthosilicate: 3.6676 grams, add appropriate amount of anhydrous Ethanol, stirred until completely dissolved to obtain solution B; mix solution A and solution B, and keep stirring in a water bath environment at 65°C until the solution becomes viscous and finally forms a transparent colloid; place the obtained colloid in In an oven, the temperature is 70°C, the time is 12 hours, aged and dried to obtain the precursor; the precursor is calcined in the air atmosphere in the muffle furnace, the temperature is 350°C, the holding tim...

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Abstract

The invention provides Eu<3+>-activated silicate-based red phosphor powder. The Eu<3+>-activated silicate-based red phosphor powder has a general chemical formula of Li2Ca<2-x>EuxSi5O13, wherein x hasa value range of no less than 0.001 and no more than 0.2. The Eu<3+>-activated silicate-based red phosphor powder is prepared through a wet chemical synthetic method. The preparation method comprisesthe following steps: 1, weighing a compound containing Li+ ions, Ca2+ ions and Eu3+ ions, adding the compound into a diluted nitric acid solution, and carrying out stirring until the compound is completely dissolved; 2, weighing tetraethoxysilane, adding the tetraethoxysilane into absolute ethyl alcohol, and carrying out uniform mixing under stirring; 3, uniformly mixing a solution obtained in the step 1 and a solution obtained in the step 2, and carrying out stirring under a water-bath condition until a transparent sol is generated; 4, placing the sol into an oven for aging, and carrying outdrying; and 5, placing a precursor into a muffle furnace for sintering, rapidly raising a temperature, carrying out natural cooling, and carrying out uniform grinding. The preparation method providedby the invention has the following beneficial effects: the red phosphor powder prepared by using the preparation method provided by the invention can be used as the red phosphor powder in white lightLED; consumption of energy is low; controllability is high; and the cost of production can be greatly saved.

Description

technical field [0001] The present invention relates to a kind of Eu 3+ An activated silicate-based red phosphor and a preparation method thereof, the phosphor can emit red fluorescence under near-ultraviolet excitation. The invention belongs to the technical field of rare earth luminescent materials. Background technique [0002] In recent years, as a new type of solid-state lighting technology, white LED is known as a new generation of lighting source that will inevitably replace high-energy incandescent lamps and fluorescent lamps excited by mercury vapor that easily pollute the environment in the 21st century. It has become more and more popular in the field of energy-saving green lighting. people's attention. As one of the important components of white LED, the nature and quality of phosphor are the most critical factors. The emission spectrum of phosphor powder and its light conversion efficiency determine the quality of white light emitted by LEDs, such as color re...

Claims

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Application Information

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IPC IPC(8): C09K11/79B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C09K11/7734Y02B20/00
Inventor 李勇峰马利杰梁明超王占奎赵红远张亚奇吴婷婷张明明张骞苏建修
Owner HENAN INST OF SCI & TECH
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