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Preparation method of europium doped yttrium/gadolinium-oxide nano polycrystalline luminescent powder

A luminescent powder, europium yttrium oxide technology, applied in the field of materials, can solve the problems of poor thermal stability and mechanical properties, difficult to completely remove organic substances, reduced luminescence performance, etc., to avoid pollution, good dispersion, and fast reaction speed. Effect

Inactive Publication Date: 2015-01-07
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The powder prepared by the spray pyrolysis method is usually hollow, with poor thermal stability and mechanical properties, and reduced luminous performance; due to the large amount of surfactant and solvent consumed by the microemulsion method, it is difficult to completely remove these particles on the surface of the target particle. Organic matter, and the cost is higher

Method used

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  • Preparation method of europium doped yttrium/gadolinium-oxide nano polycrystalline luminescent powder
  • Preparation method of europium doped yttrium/gadolinium-oxide nano polycrystalline luminescent powder
  • Preparation method of europium doped yttrium/gadolinium-oxide nano polycrystalline luminescent powder

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Embodiment 1

[0031] A preparation method of europium-doped yttrium-gadolinium oxide nano-polycrystalline luminescent powder, the process flow is as follows figure 1 As shown, the specific process steps are as follows:

[0032] (1) Weigh 1.2308g of gadolinium oxide, 3.6160g of yttrium oxide and 0.2112g of europium oxide and dissolve them completely with dilute nitric acid and make to volume;

[0033] The gadolinium nitrate of above-mentioned configuration, yttrium nitrate and europium nitrate solution are uniformly mixed into the nitrate solution of 250ml, Gd(NO 3 ) 3 , Y(NO 3 ) 3 , Eu(NO 3 ) 3 The molar concentrations are: 0.0272mol / L, 0.128mol / L, 0.0048mol / L;

[0034] (2) Add 11.5284g of citric acid into the above-mentioned mixed nitrate solution and stir until completely dissolved, so that the molar concentration of citric acid in the mixed solution is 0.24mol / L; measure the pH value of the solution with an acidity meter, and the solution is obviously Acidic, use a dropper to a...

Embodiment 2

[0041] A preparation method of europium-doped yttrium-gadolinium oxide nano-polycrystalline luminescent powder, the process flow is as follows figure 1 As shown, the specific process steps are as follows:

[0042] (1) Weigh 2.6788g of gadolinium oxide, 2.7120g of yttrium oxide and 0.2112g of europium oxide and dissolve them completely with dilute nitric acid and make to volume;

[0043] The gadolinium nitrate of above-mentioned configuration, yttrium nitrate and europium nitrate solution are uniformly mixed into the nitrate solution of 250ml, Gd(NO 3 ) 3 , Y(NO 3 ) 3 , Eu(NO 3 ) 3 The molar concentrations are: 0.0592mol / L, 0.096mol / L, 0.0048mol / L;

[0044](2) Add 11.5284g of citric acid into the above-mentioned mixed nitrate solution and stir until completely dissolved, so that the molar concentration of citric acid in the mixed solution is 0.24mol / L; measure the pH value of the solution with an acidity meter, and the solution is obviously Acidic, use a dropper to a...

Embodiment 3

[0051] A preparation method of europium-doped yttrium-gadolinium oxide nano-polycrystalline luminescent powder, the process flow is as follows figure 1 As shown, the specific process steps are as follows:

[0052] (1) Weigh 4.1268g of gadolinium oxide, 1.8080g of yttrium oxide and 0.2112g of europium oxide and dissolve them completely with dilute nitric acid and make to volume;

[0053] The gadolinium nitrate of above-mentioned configuration, yttrium nitrate and europium nitrate solution are uniformly mixed into the nitrate solution of 250ml, Gd(NO 3 ) 3 , Y(NO 3 ) 3 , Eu(NO 3 ) 3 The molar concentrations are: 0.0912mol / L, 0.064mol / L, 0.0048mol / L;

[0054] (2) Add 11.5284g of citric acid into the above-mentioned mixed nitrate solution and stir until completely dissolved, so that the molar concentration of citric acid in the mixed solution is 0.24mol / L; measure the pH value of the solution with an acidity meter, and the solution is obviously Acidic, use a dropper to ...

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Abstract

The invention discloses a preparation method of europium doped yttrium / gadolinium-oxide nano polycrystalline luminescent powder, relating to the field of nano materials. The preparation method comprises the following preparation steps: (1) preparing Gd (NO3) 3, Y (NO3) 3 and Eu (NO3) 3 solutions with different amount-of-substance concentrations; (2) weighting a citric acid, and adding the citric acid into the mixed nitrate solution; and controlling the temperature and pH of the obtained mixed liquid; (3) heating the obtained pale yellow solution so as to concentrate and combust the solution, so that precursor powder is obtained; and (4) collecting the precursor powder, and after the precursor powder is ground and scattered, calcining the obtained product, so that the target powder is obtained. According to the preparation method disclosed by the invention, an adopted sol gel-combustion method combines the advantages of a sol-gel method and a combustion method, so that on the one hand, in the process of sol formation, components are put into a solution, and therefore, the uniform mixing of atomic and molecular levels can be achieved; and on the other hand, a complexing agent is both a reactant and a fuel, therefore, the whole reaction speed is high, the efficiency is high, the quality of synthesized products is high, and synthesized powder is good in dispersibility, uniform in granularity, and good in luminescence property.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a method for preparing europium-doped yttrium-gadolinium oxide nano-polycrystalline luminescent powder by using a sol-gel-combustion method. Background technique [0002] Eu:Y 2 o 3 It is a red phosphor with excellent performance, which is widely used in color TV, projection TV picture tube, and three-color fluorescent lighting equipment. Y 3+ with Gd 3+ With the same valence, similar ionic radius, toward Y 2 o 3 Quantitative Gd 2 o 3 Can form solid solution (Y, Gd) 2 o 3 , while Eu 3+ :(Y,Gd) 2 o 3 (Eu:YGO for short) is a high-efficiency X-ray luminescent material that can be used as a raw material for the preparation of high optical quality Eu:YGO transparent ceramics with wide application value in medical and industrial CT. [0003] As a luminescent powder, its quality is closely related to the type and concentration of dopant ions, matrix components, particle s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78
Inventor 苏静桑琳顾芳潘宁谭小妹厉航韩威
Owner NANJING UNIV OF INFORMATION SCI & TECH