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Microwave energy alcohol thermal growth method for red light luminous crystal

A technology of luminescent crystals and growth methods, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of difficult shape control, serious agglomeration, incomplete crystallization, etc., achieve easy recycling and reuse, and overcome environmental pollution Effect

Inactive Publication Date: 2013-07-10
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of preparing rare earth sulfides is a high-temperature solid-phase synthesis method. The main problem is that the crystallization is incomplete, there are many defects, serious agglomeration, and it is not easy to control the shape.

Method used

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  • Microwave energy alcohol thermal growth method for red light luminous crystal
  • Microwave energy alcohol thermal growth method for red light luminous crystal
  • Microwave energy alcohol thermal growth method for red light luminous crystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method of microwave energy alcohol thermal growth of red light emitting crystals, the preparation steps are as follows:

[0020] 1) According to the chemical formula Ca of the crystal 0.994 S:0.004Mn 2+ ,0.002Eu 2+ meter, weigh 2.95208g of CaCl 2 2H 2 O, 4.90163g of Na 2 S·9H 2 O, 0.015993 g of MnCl 2 4H 2 O and 0.014673 g of EuCl 3 ·6H 2 O solid, after mixing it is dissolved in ethanol, the mass ratio of solid raw material total amount and ethanol is 1:3;

[0021] 2) Ultrasonicate the obtained mixed solution for 40 minutes at a power of 60 watts and a temperature of 60°C, and then transfer the homogeneous ultrasonically oscillated precursor solution into a high-strength frame-type reaction tank with a volume filling rate of 30%;

[0022] 3) Put the reaction tank into a microwave reactor and heat it. The process parameters of the microwave reactor are: microwave frequency 2.45GHz, power 1.60Kw, heat up to 180°C, and keep warm at this temperature for 7 hours;...

Embodiment 2

[0027] A method of microwave energy alcohol thermal growth of red light emitting crystals, the preparation steps are as follows:

[0028] 1) According to the chemical formula Ca of the crystal 0.698 m g0.3 S:0.002Eu 2+ meter, weigh 2.07299g of CaCl 2 2H 2 O, 4.90163g of Na 2 S·9H 2 O, 1.24469 g of MgCl 2 ·6H 2 O and 0.014673 g of EuCl 3 ·6H 2 O solid, after mixing it is dissolved in Virahol, the mass ratio of solid raw material total amount and Virahol is 1:4;

[0029] 2) Ultrasonicate the obtained mixed solution for 40 minutes at a power of 60 watts and a temperature of 60°C, and then transfer the homogeneous ultrasonically oscillated precursor solution into a high-strength frame-type reaction tank with a volume filling rate of 40%;

[0030] 3) Then put the reaction tank into a microwave reactor for heating. The process parameters of the microwave reactor are: microwave frequency 2.45GHz, power 1.60Kw, heat up to 180°C, and keep warm at this temperature for 7 hours;...

Embodiment 3

[0035] A method of microwave energy alcohol thermal growth of red light emitting crystals, the preparation steps are as follows:

[0036] 1) According to the chemical formula Ca of the crystal 0.894 Mg 0.1 S:0.004Mn 2+ ,0.002Eu 2+ meter, weigh 2.65509g of CaCl 2 2H 2 O, 4.90163g of Na 2 S·9H 2 O, 0.015993 g of MnCl 2 4H 2 O, 0.4149g of MgCl 2 ·6H 2 O and 0.014673 g of EuCl 3 ·6H 2 O solid, after mixing it is dissolved in n-propanol, the mass ratio of solid raw material total amount and n-propanol is 1:5;

[0037] 2) Ultrasonicate the obtained mixed solution for 40 minutes at a power of 60 watts and a temperature of 60°C, and then transfer the homogeneous ultrasonically oscillated precursor solution into a high-strength frame-type reaction tank with a volume filling rate of 50%;

[0038] 3) Then put the reaction tank into a microwave reactor for heating. The process parameters of the microwave reactor are: microwave frequency 2.45GHz, power 1.60Kw, heat up to 180°C...

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Abstract

The invention discloses a microwave energy alcohol thermal growth method for a red light luminous crystal. A chemical metering formula of the crystal is Ca(1-a-b-c)MgaS:bMn; chemical valences of ions of cEu, Mn and Eu are divalent; a, b and c are atom mole numbers, wherein a is more than or equal to 0.0 and less than or equal to 0.5; b is more than or equal to 0.000 and less than or equal to 0.005, and c is more than or equal to 0.000 and less than or equal to 0.003; solid materials are dissolved by using alcohols; alcohol thermal growth is carried out in an enclosed reaction tank of a microwave reactor; and after solid-liquid separation and annealing treatment are carried out, the red light luminous crystal of which the emission main wavelength is 660 nanometers can be manufactured. The microwave energy alcohol thermal growth method has the advantages that a microwave energy heating means is utilized, the method has the advantage of energy conservation and can overcome the defect of environment pollution in the traditional preparation method in the enclosed reaction tank; the solvent can be recycled, and the emission wavelength of the crystal is easily modulated to a required red light wavelength position, so that the red light can be emitted after the crystal can be effectively excited by the green light and the blue light.

Description

【Technical field】 [0001] The invention belongs to the preparation of rare earth luminescent materials, in particular to a microwave energy alcohol thermal growth method of red luminescent crystals. 【Background technique】 [0002] The far-red light with a characteristic wavelength of 660 nanometers has the function of improving the photosynthesis efficiency of plants and repairing human skin. There are two types of light sources for realizing red light emission with a characteristic wavelength of 660 nanometers: sunlight and artificial light. In sunlight, 99.9% of the energy of solar electromagnetic radiation is concentrated in the infrared region, visible light region and ultraviolet region, and solar radiation is mainly concentrated in the visible light part with a wavelength of 400 nanometers to 760 nanometers, accounting for about 50% of the total energy of solar radiation. %. In the blue-violet and green light bands of visible light, including green light at 577-492 na...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/56
Inventor 王达健董晓菲陆启飞孙亮卢志娟马健王延泽王芳李蕊张运杰
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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