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Method for improving luminosity of europium-doped yttrium oxide red fluorescent powder

A technology of red fluorescent powder and luminous brightness, applied in chemical instruments and methods, luminescent materials, etc., to achieve the effects of increased luminous intensity, mild reaction conditions, and simple process

Inactive Publication Date: 2011-05-18
ZHEJIANG SCI-TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The hydrothermal method is a relatively simple process for preparing Y2O3:Eu3+ red powder, but the obtained micro-nano products There are many defects, which reduces the luminous intensity. The common method to reduce defects is to choose a suitable surfactant, but how to choose a surfactant and the optimization of the amount of surfactant will bring subsequent troubles

Method used

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  • Method for improving luminosity of europium-doped yttrium oxide red fluorescent powder
  • Method for improving luminosity of europium-doped yttrium oxide red fluorescent powder
  • Method for improving luminosity of europium-doped yttrium oxide red fluorescent powder

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Embodiment 1

[0020] Get 1.1642 grams of yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O), 0.0714 grams of europium nitrate (Eu(NO 3 ) 3 ·6H 2 O) be dissolved in 40 milliliters of deionized water, the concentrations of yttrium nitrate and europium nitrate are respectively 0.0760 mol / liter and 0.0040 mol / liter, and stir. Add 32 milliliters of 1 mol / liter sodium hydroxide solution to the above solution, control the number of moles of sodium hydroxide to be 10 times of the total number of moles of rare earth cations, and stir. Put the above prepared solution into a polytetrafluoroethylene-lined autoclave with a filling degree of 80% and a liner volume of 100 milliliters. The solution was treated at 220°C for 24 hours, and the cooled solution was centrifuged to obtain a product with a molar concentration of europium doped at 5%. In the solid product that above-mentioned centrifugation obtains, add deionized water, stir, then 0.1225 gram of yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O) dissolved therein, th...

Embodiment 2

[0022] Get 1.1642 grams of yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O), 0.0714 grams of europium nitrate (Eu(NO 3 ) 3 ·6H 2 (0) be dissolved in 40 milliliters of deionized water, the molar concentrations of yttrium nitrate and europium nitrate are respectively 0.0760 mol / liter, 0.0040 mol / liter, stir, add 32 milliliters of 1 mol / liter sodium hydroxide solutions in the above-mentioned solution, control The molar number of sodium hydroxide is 10 times of the total rare earth cation molar number, stirring. The stirred solution was put into a polytetrafluoroethylene-lined autoclave with a filling degree of 80% and a liner volume of 100 ml. The solution was treated at 220°C for 24 hours, the cooled solution was centrifuged and dried, and the doping concentration of europium accounted for 5% of the total moles of rare earth elements. In the solid product that above-mentioned centrifugation obtains, add deionized water, stir, then 0.1532 gram of yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O)...

Embodiment 3

[0024] Get 1.1642 grams of yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O), 0.0714 grams of europium nitrate (Eu(NO 3 ) 3 ·6H 2 O) be dissolved in 40 milliliters of deionized water, the molar concentrations of yttrium nitrate and europium nitrate are respectively 0.0760 mol / liter and 0.0040 mol / liter, and stir. Add 32 milliliters of 1 mol / liter sodium hydroxide solution to the above solution, control the number of moles of sodium hydroxide to be 10 times of the total number of moles of rare earth cations, and stir. Put the above prepared solution into a polytetrafluoroethylene-lined autoclave with a filling degree of 80% and a liner volume of 100 milliliters. The solution was treated at 220°C for 24 hours, the cooled solution was centrifuged, and the doping concentration of europium accounted for 5% of the total moles of the total rare earth elements. In the solid product that above-mentioned centrifugation obtains, add deionized water, stir, then 0.2450 gram of yttrium nitrate (Y(...

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Abstract

The invention discloses a method for improving luminosity of europium-doped yttrium oxide red fluorescent powder. In the method, yttrium nitrate, europium nitrate and sodium hydroxide are used as reactants, a two-steps hydrothermal method is carries out in cooperation with subsequent thermal treatment. The method specifically comprises the steps of: firstly, synthesizing Y(OH)3:Eu<3+> at 220 DEG C hydrothermally, then, cladding the Y(OH)3 onto the surface of the Y(OH)3:Eu<3+> under the hydrothermal condition, and finally carrying out thermal treatment on the obtained product at 1000 DEG C to obtain the fluorescent powder of a Y2O3:Eu<3+> / Y2O3 nuclear-shell structure, wherein the molar ratio of the nuclear of Y2O3:Eu<3+> to the shell of Y2O3 is (3:1)-(10:1). By means of the homogeneous cladding, the surface defects of the Y2O3:Eu<3+> nano light-emitting particles can be effectively reduced, and the luminosity of the Y2O3:Eu<3+> nano light-emitting particles can be improved by 5-28% in comparison with that of like products without cladding. By means of the method, the luminosity of the homogeneous cladding product is obviously improved, the advantages of simple process, mild reaction conditions and convenience in operation are achieved, and the method is suitable for large-scale industrialized production.

Description

technical field [0001] The invention relates to a preparation method for improving the luminous brightness of europium-doped yttrium oxide red fluorescent powder. Background technique [0002] Rare earth luminescent materials have great application value and potential prospects in many fields, such as low-light lighting, imaging display, radiation detection, emergency indication, architectural decoration and arts and crafts and other fields. At present, yellow-green and blue luminescent materials have been widely used, but red luminescent materials have not yet reached the level of the above two types in terms of afterglow time and luminous intensity. Therefore, research on improving and increasing the luminous intensity of red luminescent materials has attracted much attention. [0003] Y 2 o 3 :Eu 3+ It is an excellent red fluorescent material with high luminous efficiency and high color purity and light maintenance characteristics. The common synthesis methods mainly ...

Claims

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Application Information

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IPC IPC(8): C09K11/78
Inventor 高林辉汪伦祝洪良陈建军偶国富王耐艳
Owner ZHEJIANG SCI-TECH UNIV
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