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Preparation method of cerium ion-doped lutetium silicate powder by liquid phase package method at low temperature

A wrapping method, cerium ion technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of irregular morphology, low synthesis temperature and low calcination temperature of lutetium silicate, and achieve controllable particle size of powder, The effect of small powder particle size and low calcination temperature

Inactive Publication Date: 2013-03-06
SHANGHAI UNIV
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Problems solved by technology

The main advantage of the solid-phase method is that the preparation process is simple, which is beneficial to industrial production. The disadvantages are that the calcination temperature is high (1400-1600 ° C), the reaction time is long (more than 6 hours of heat preservation), the equipment requirements are high, and the energy consumption is high. The obtained product is blocky. It is not conducive to the preparation of LSO ceramic materials in the next step
The advantage of the sol-gel method is that the components participating in the reaction are mixed at the atomic and molecular levels, the synthesized luminescent material has a finer particle size, and the synthesis temperature of LSO is lower than that of the traditional solid-phase synthesis method; the disadvantage Compared with the high-temperature solid-phase method, it is easy to introduce impurities, the luminescence performance and afterglow performance of the synthetic product are poor, and the operation process is complicated, the reaction process is not easy to control, and the reaction cycle is long
The powder synthesized by the liquid phase precipitation method has a smaller particle size and a lower calcination temperature, but there are many steps, the reaction process is easy to introduce impurities, and the prepared lutetium silicate has irregular morphology and agglomeration phenomenon

Method used

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  • Preparation method of cerium ion-doped lutetium silicate powder by liquid phase package method at low temperature
  • Preparation method of cerium ion-doped lutetium silicate powder by liquid phase package method at low temperature
  • Preparation method of cerium ion-doped lutetium silicate powder by liquid phase package method at low temperature

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Embodiment 1

[0016] a. Add 250ml of absolute ethanol, 35ml of deionized water and 7ml of concentrated ammonia into a clean beaker in sequence. After mixing evenly, slowly drop into the mixed solution of 20ml tetraethyl orthosilicate and 200ml absolute ethanol, under stirring with a magnetic stirrer, seal the bottle mouth with a polyvinyl chloride film and react at a constant temperature of 85°C for 5h, then separate by centrifugation SiO in colloidal solution 2 The nanospheres were separated and dried in an oven at 100°C for 12 hours to obtain SiO with a particle size of 200nm. 2 Microspheres;

[0017] b. Weigh 0.1 g SiO2 2 Spherical particles were mixed with 500 ml deionized water and then ultrasonically dispersed for 15 min to obtain a sol-like liquid. Mix 1100 ml deionized water, 6.33 ml lutetium nitrate solution, 3.2 ml cerium nitrate solution and 38 g urea evenly. Pour the two solutions into a 3000 ml beaker, stir on a magnetic stirrer, and keep the solution temperature at 85°C, a...

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Abstract

The invention relates to a preparation method of a cerium ion-doped lutetium silicate (LSO: Ce<3+>) powder by a liquid phase package method at low temperature, belonging to the technical field of preparation of an inorganic luminescent nano material. The preparation method comprises the following steps of: hydrolyzing tetraethyl orthosilicate (TEOS) in mixture solution of ammonia (NH3. H2O) and water (H2O) by an Stober method to prepare monodisperse SiO2 spherical particles; packing Lu(OH)3 on the surface of Lu<3+> ionic solution by changing a PH value in the Lu<3+> ionic solution and using a liquid phase package method to obtain Lu(OH)3@SiO2 composite particles with core shell structures; realizing the in situ synthesis of LSOc particles by high-temperature calcination; and synthesizing the cerium-doped lutetium silicate powder (LSO: Ce<3+>) under the calcination condition of 1200 DEG C.

Description

technical field [0001] The invention relates to a method for preparing cerium ion-doped lutetium silicate powder at low temperature by using a liquid-phase encapsulation method, and belongs to the technical field of inorganic nano-luminescent materials. Background technique [0002] With the application of nuclear science and technology in medicine, X-ray tomography (CT) and positron annihilation tomography (PET) were born, which expanded the application of scintillation crystals from high-energy physics to nuclear medicine. Correspondingly, higher requirements are put forward for the performance of scintillation crystals. Traditional scintillation crystals NaI(Tl) and BGO can no longer meet the application requirements of nuclear medicine scintillation crystals. People have begun to explore strong luminescence, short attenuation, strong absorption, A new type of excellent scintillation crystal with stable physical and chemical properties. Lutetium silicate doped with ceriu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/79
Inventor 施鹰许志斌林德宝谢建军范灵聪
Owner SHANGHAI UNIV
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