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Cerium-doped gadolinium disilicate luminescent material and preparation method thereof

A luminescent material, gadolinium silicate technology, applied in the direction of luminescent materials, polycrystalline material growth, chemical instruments and methods, etc., can solve problems such as shortening scintillation crystal decay time, achieve improved scintillation performance, easy to realize, and simple preparation method Effect

Inactive Publication Date: 2016-09-28
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the preparation of cerium-doped gadolinium disilicate luminescent materials to shorten the decay time of scintillation crystals

Method used

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  • Cerium-doped gadolinium disilicate luminescent material and preparation method thereof
  • Cerium-doped gadolinium disilicate luminescent material and preparation method thereof
  • Cerium-doped gadolinium disilicate luminescent material and preparation method thereof

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Effect test

Embodiment 1

[0037] In this embodiment, a method for preparing a cerium-doped gadolinium disilicate luminescent material is to prepare a scintillation single crystal of cerium-doped gadolinium disilicate by using the optical floating zone method, including the following steps:

[0038] ① Ingredients: According to the chemical formula (Gd 0.899 Lu 0.1 Ce 0.001 ) 2 Si 2 o 7 and (Gd 0.895 Lu 0.1 Ce 0.001 Mg 0.004 ) 2 Si 2 o 7 The stoichiometric ratio of Gd 2 o 3 、Lu 2 o 3 , SiO 2 , CeO 2 and each raw material in MgO are evenly mixed to prepare two groups of raw material mixtures;

[0039] ② Sintering: The raw material mixture uniformly mixed in step ① is fully and evenly mixed, put into a Ф10mm rubber tube and sealed, and isostatically pressed at a pressure of 200Mpa to form a dense billet blank, and then use Pt wire to seal it. Hanging in a muffle furnace for sintering, the sintering temperature is 1600°C, the sintering time is 20 hours, and two sets of polycrystalline rods...

Embodiment 2

[0044] This embodiment is basically the same as Embodiment 1, especially in that:

[0045] In this embodiment, a method for preparing a cerium-doped gadolinium disilicate luminescent material is to prepare a scintillation single crystal of cerium-doped gadolinium disilicate by a pulling method, including the following steps:

[0046] ⅰ. Ingredients: According to the chemical formula (Gd 0.899 La 0.1 Ce 0.001 ) 2 Si 2 o 7 and (Gd 0.895 La 0.1 Ce 0.001 Ca 0.004 ) 2 Si 2 o 7 The stoichiometric ratio of Gd 2 o 3 , La 2 o 3 , SiO 2 , CeO 2 and CaCO 3 The raw materials in the mixture are uniformly mixed to prepare two groups of raw material mixtures;

[0047] ⅱ. Sintering: The raw material mixture uniformly mixed in step i is fully and evenly mixed and then put into a rubber tube of Ф10mm for sealing, pressed into a dense ingot green body by isostatic pressing at a pressure of 20Mpa, and then put into a muffle Sintering in the furnace, the sintering temperature i...

Embodiment 3

[0052] This embodiment is basically the same as the previous embodiment, and the special features are:

[0053] In this embodiment, a method for preparing a cerium-doped gadolinium disilicate luminescent material, using the top seed method to prepare a scintillation single crystal of cerium-doped gadolinium disilicate, includes the following steps:

[0054] Ⅰ. Ingredients: According to the chemical formula (Gd 0.899 Y 0.1 Ce 0.001 ) 2 Si 2 o 7 and (Gd 0.895 Y 0.1 Ce 0.001 Mg 0.004 In 0.004 ) 2 Si 2 o 7 The stoichiometric ratio of Gd 2 o 3 , Y 2 o 3 , SiO 2 , Ce(NO 3 ) 3 , MgO and In 2 o 3 The raw materials in the mixture are uniformly mixed, and two sets of raw material mixtures are prepared. When batching, SiO 2 As a flux, the excess molar ratio of the ingredients is 10%;

[0055] Ⅱ. Sintering: The raw material mixture uniformly mixed in step Ⅰ is fully and evenly mixed and then put into a Ф50mm rubber tube for sealing, and isostatically pressed at a pr...

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Abstract

The invention discloses a cerium-doped gadolinium disilicate luminescent material and a preparation method thereof. The chemical formula of the material is (Gd[1-x-y-z]KxCeyMz)2Si2O7, wherein K is one or combination of more of La, Lu, Y and Sc; M is one or combination of more of Mg<2+>, Ca<2+>, Ba<2+>, B<3+> and In<3+>; and 0<=x<=0.995, 0.00001<=y<=0.05, and 0<=z<=0.05. The main group ions Mg<2+>, Ca<2+>, Ba<2+>, B<3+> and In<3+> are additionally added into the luminescent material cerium-doped gadolinium disilicate to prepare the cerium-doped gadolinium disilicate scintillator monocrystals and fluorescent powder. Compared with the gadolinium disilicate luminescent material without doped main group ions, the phosphor-decay time of the main-group-ion-doped cerium-doped gadolinium disilicate scintillator monocrystals and fluorescent powder is obviously shortened, and the scintillation properties of the cerium-doped gadolinium disilicate scintillator monocrystals and fluorescent powder are optimized.

Description

technical field [0001] The invention relates to a luminescent material and a preparation method thereof, in particular to a scintillation crystal or fluorescent powder material and a preparation method thereof, which are applied in the technical field of optical functional materials. Background technique [0002] Scintillation crystals are often used to detect high-energy rays or particles such as X and γ, and are widely used in nuclear medical imaging (CT, PET, etc.), nuclear physics, high-energy physics, and geological exploration. In 2000, D.pauwels first proposed (see: D. Pauwels, N.I.M, B.Viana, et al.A Novel Inorganic Scintillator : Lu2Si2O7:Ce 3+ (LPS). IEEE Transactions on Nuclear Science , 2000 , 47(6): 1787-1790) Lu 2 Si 2 o 7 :Ce (LPS:Ce), a scintillation crystal with excellent performance, reported that its average light output reached 22000ph / MeV, which opened up the research on rare earth doped pyrosilicates. In 2005, N Karar reported on Y 2 Si 2 o 7 Opt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79C30B29/34C30B13/00C30B15/00
CPCC09K11/7774C09K11/778C30B13/00C30B15/00C30B29/34
Inventor 冯鹤肖丰张志军徐展赵景泰
Owner SHANGHAI UNIV
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