Large-bulk high-quality scintillation crystal and preparation method and application thereof

A scintillation crystal, high-quality technology, applied in the direction of crystal growth, chemical instruments and methods, measuring devices, etc., to achieve the effect of good crystal quality, small refractive index, and short decay time

Active Publication Date: 2021-10-19
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the advantages of high light yield, excellent energy resolution and fast decay time of existing halogen perovskite scintillation crystals, the present invention provides a large-scale high-quality scintillation crystal and its preparation method and application

Method used

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  • Large-bulk high-quality scintillation crystal and preparation method and application thereof
  • Large-bulk high-quality scintillation crystal and preparation method and application thereof
  • Large-bulk high-quality scintillation crystal and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] CsMg 0.99 Eu 0.01 I 3 The preparation of bulk crystals, the steps are as follows:

[0064] 1) CsI, MgI in the glove box 2 and EuI 2 Mix evenly according to the stoichiometric ratio, put it into a quartz tube and seal it, and the vacuum degree reaches 10 –6 mbar.

[0065] 2) Put the sealed quartz tube into a resistance furnace, heat up to 450°C at a rate of 100°C / h, then cool down to 100°C at a rate of 50°C / h, and then heat up to 450°C at a rate of 100°C / h , after three cycles, keep the temperature at 450°C for 10 hours, and then lower it to 25°C at a rate of 15°C / h to obtain CsMg 0.99 Eu 0.01 I 3 Polycrystalline;

[0066] 3) will contain CsMg 0.99 Eu 0.01 I 3 Put the polycrystalline quartz tube into the crucible drop furnace, heat up to 420°C, keep it warm for 10 hours, adjust the position of the quartz tube so that the temperature at the bottom of the quartz tube at the spontaneous nucleation area or the seeding area is 1-5°C higher than the melting point, ...

Embodiment 2

[0072] CsMg 0.95 Eu 0.05 Cl 3 The preparation of bulk crystals, the steps are as follows:

[0073] 1) In the glove box, mix CsCl, MgCl2 and EuCl2 evenly according to the stoichiometric ratio, put them into a quartz tube and seal it, and the vacuum degree reaches 10 -6 mbar.

[0074] 2) Put the sealed quartz tube into a resistance furnace, heat up to 650°C at a rate of 100°C / h, then cool down to 100°C at a rate of 50°C / h, and then heat up to 650°C at a rate of 100°C / h , after three cycles, keep the temperature at 650°C for 10 hours, and then lower it to 25°C at a rate of 15°C / h to obtain CsMg 0.95 Eu 0.05 Cl 3 Polycrystalline;

[0075] 3) will contain CsMg 0.95 Eu 0.05 Cl 3 Put the polycrystalline quartz tube into the crucible drop furnace, raise the temperature to 615°C, keep it warm for 10 hours, adjust the position of the quartz tube so that the temperature at the bottom of the quartz tube at the spontaneous nucleation area or the inoculation area is 1-5°C higher t...

Embodiment 3

[0080] CsMgCl 3 The preparation of bulk crystals, the steps are as follows:

[0081] 1) In the glove box, mix CsCl and MgCl2 evenly according to the stoichiometric ratio, put them into a quartz tube and seal them, and the vacuum degree reaches 10 –6 mbar.

[0082] 2) Put the sealed quartz tube into a resistance furnace, heat up to 650°C at a rate of 100°C / h, then cool down to 100°C at a rate of 50°C / h, and then heat up to 650°C at a rate of 100°C / h , after three cycles, keep the temperature at 650°C for 10 hours, and then lower it to 25°C at a rate of 15°C / h to obtain polycrystalline CsMgCl3;

[0083] 3) Put the polycrystalline quartz tube containing CsMgCl3 into the crucible descending furnace, heat up to 615°C, keep it warm for 10 hours, adjust the position of the quartz tube so that the temperature at the bottom of the quartz tube at the spontaneous nucleation area or the inoculation area is higher than the melting point by 1- 5°C, the temperature gradient in the single cr...

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Abstract

The invention relates to a large-bulk high-quality scintillation crystal and a preparation method and application thereof. The scintillation crystal takes a CsMgX3 crystal as a matrix and is doped or not doped with rare earth elements and / or alkali metal, wherein the rare earth element is one selected from Eu and Pr; the alkali metal is 6Li; and the large-bulk high-quality crack-free single crystal is grown for the first time by using a Bridgman method. The obtained scintillation crystal is a novel all-inorganic halogen perovskite bulk crystal which is large in size, good in crystal quality, high in transmittance and small in refractive index, and has a crystal diameter of 10-25 mm; the attenuation time of the crystal is very short and is only several nanoseconds; and the scintillation crystal with luminescence can realize neutron and gamma ray dual detection, has high atomic number and small band gap, and has very good application prospects.

Description

technical field [0001] The invention relates to a large-block high-quality scintillation crystal, a preparation method and application thereof, and belongs to the technical field of crystal growth. Background technique [0002] Scintillators are a class of materials that can emit visible light after absorbing high-energy particles or rays, and play a very important role in the field of radiation detection. Under the irradiation of high-energy rays, the visible light emitted by the scintillator is converted into electrical signals through photomultiplier tubes, photodiodes or avalanche photodiodes, so as to detect or image high-energy particles or rays. In medicine, scintillators are the core components of nuclear medicine imaging equipment, through which the lesions of various organs of the human body, the size and location of tumor tissues can be quickly diagnosed. It also plays an irreplaceable role in baggage security inspection, non-destructive testing, radiation detect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/12C30B11/02G01T1/202
CPCC30B29/12C30B11/02G01T1/2023
Inventor 李静温航王彪
Owner SHANDONG UNIV
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