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Method for preparing Ce3+ doped lutetium oxyorthosilicate luminescent powder using organic compound auxiliary low temperature

A technology for organic compounds and luminescent powders, applied in rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of long preparation period and harsh reaction conditions, and achieve the effect of lowering synthesis temperature and uniform particle size distribution

Inactive Publication Date: 2010-06-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem with this sol-gel method is that the reaction conditions are relatively harsh and sensitive to moisture. Generally, it is required to be carried out under vacuum conditions or dry nitrogen atmosphere, and the preparation cycle is long. Like ERIC BESCHER, metal Lu, isopropanol and TEOS are used as starting materials. The starting material is mercuric chloride as a catalyst, and the sol can be obtained by refluxing in a vacuum environment for 3 to 5 days

Method used

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  • Method for preparing Ce3+ doped lutetium oxyorthosilicate luminescent powder using organic compound auxiliary low temperature
  • Method for preparing Ce3+ doped lutetium oxyorthosilicate luminescent powder using organic compound auxiliary low temperature
  • Method for preparing Ce3+ doped lutetium oxyorthosilicate luminescent powder using organic compound auxiliary low temperature

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 20g of lutetium chloride (LuCl 3 ), 8.05ml of tetraethyl orthosilicate (TEOS) (the content of silicon dioxide is 28.4%) was dissolved in 20ml of isopropanol, stirred at 600 rpm for 30 minutes, then added 99.61ml with a concentration of 14.26 mol / l reaction additive propylene oxide (PPO) and 0.68ml concentration of 0.522mol / l cerium nitrate solution were magnetically stirred in a closed environment for 24 hours, and the stirring rate was 1800 rpm. After the reaction, a white solid was obtained. The colloidal precipitate is both the precursor precipitate. The precursor precipitate was dried at 100°C and then placed in an alumina crucible and calcined at 1000°C in a muffle furnace, and kept at this temperature for 2 hours with a heating rate of 1.5°C / min to finally obtain Ce 3+ Doped lutetium silicate luminescent powder.

Embodiment 2

[0027] 8 g of lutetium chloride (LuCl 3 ), 3.22ml of tetraethyl orthosilicate (TEOS) (the content of silicon dioxide is 28.4%) was dissolved in 10ml of isopropanol, stirred at 600 rpm for 30 minutes, then added 39.84ml with a concentration of 14.26 mol / l reaction additive propylene oxide (PPO) and 0.27ml concentration of 0.522mol / l cerium nitrate solution were magnetically stirred in a closed environment for 24 hours, and the stirring rate was 1800 rpm. After the reaction, a white solid was obtained. The colloidal precipitate is both the precursor precipitate. The precursor precipitate was dried at 100°C and then placed in an alumina crucible and calcined at 1000°C in a muffle furnace, and kept at this temperature for 2 hours with a heating rate of 1.5°C / min to finally obtain Ce 3+ Doped lutetium silicate luminescent powder.

[0028] The results of the powder samples obtained in the examples of the present invention tested by various instruments are listed in the accompanyin...

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Abstract

The invention relates to a method for preparing Ce<3+> doped lutetium orthosilicate luminescent powders at low temperature by adopting an organic compound, which belongs to the preparation process technology field of rare earth compound luminescent powders. The method is characterized in that lutecium trichloride (LuCl3) and ethyl orthosilicate (TEOS) are used as raw materials, propylene oxide (PPO) is used as a reaction promoter, a pioneer precipitate is obtained through a proper liquid phase reaction, the calcination treatment is conducted subsequently at the temperature ranging from 900 to1300, the pioneer precipitate is processed through thermal retardation form 2 to 6 hours at the temperature ranging from 900 to 1300, and the Ce<3plus> doped lutetium orthosilicate luminescent powdersare obtained finally. The grain diameter of the obtained powders is about 200 nanometers, the particles are distributed evenly, and no agglomeration exists on the whole. In the method, single-phase lutetium orthosilicate (LSO) powders are obtained after calcining for 2 hours at lower temperature that is lower than 1000 DEG C. By adopting the method, the prepared Ce:LSO luminescent powders can beused in the growth of scintillation crystal in a scintillator detector, can be used in the preparation of scintillating ceramic material, and also can be used as luminescent powders singly.

Description

technical field [0001] The invention relates to a method for preparing Ce at low temperature with the assistance of organic compounds 3+ A method for doping lutetium silicate luminescent powder belongs to the technical field of rare earth compound luminescent powder preparation technology. Background technique [0002] Lu was first discovered by C.L.Melcher and J.S.Schweitzer in 1992 2 SiO 5 (LSO:Ce) single crystal material is a scintillator material with superior performance, and its density is 7.4g / cm 3 , the effective atomic number is 66, the radiation length is 1.14cm, the emission intensity is 75% of that of thallium-doped sodium iodide, the light output is 26300ph / Mev, the decay time is 40ns, the energy resolution is 9%, and the emission peak is at 420nm. Based on the above characteristics, this material has broad application prospects in nuclear medical imaging technologies such as CT (Computed Tomography, Computed Tomography) and Positron Emission Tomography (PET...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00C09K11/79
Inventor 云平施鹰谢建军周鼎
Owner SHANGHAI UNIV