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Two-dimensional organic-inorganic hybrid perovskite scintillator capable of simultaneously detecting gamma rays and fast neutrons and preparation of two-dimensional organic-inorganic hybrid perovskite scintillator

A perovskite and fast neutron technology, applied in the direction of scintillation detector measurement, measurement device, radiation measurement, etc., can solve the problems of lack of scintillator materials, poor crystal quality, unawareness, etc., and achieve short fluorescence lifetime , fast response speed, high light output effect

Active Publication Date: 2022-03-18
HUAZHONG UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

Simultaneous fast neutrons and gamma rays (n f The time information provided by / γ) detection is of great significance to high-energy physics and nuclear monitoring, but there is currently a lack of scintillator materials that can efficiently detect γ-rays and fast neutrons at the same time
[0004] Chinese patent CN111348675A discloses Cs 3 Cu 2 x 5 (X is Cl, Br, I) Nanocrystalline scintillators are used for X-ray imaging, although it also discloses the use of scintillators for X-ray detection, but due to the lack of light elements in the material system, it cannot be carried out by the nuclear recoil method. sub probe
[0005] Chinese patent CN112457843A discloses PEA 2 PbBrxCl (4-x) For X-ray or γ-ray detection, where PEA represents phenylethylamine, and x is any real number satisfying 4≥x≥0, although it also discloses organic-inorganic hybrid two-dimensional perovskite scintillators for high-energy ray detection , but there is no seed crystal used in the crystal growth process, resulting in poor crystal quality and poor repeatability. At the same time, the patent does not involve neutron detection, that is, it does not realize that organic-inorganic hybrid two-dimensional perovskite scintillators can be used. Organic groups, by nuclear recoil method, for neutron energy deposition

Method used

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  • Two-dimensional organic-inorganic hybrid perovskite scintillator capable of simultaneously detecting gamma rays and fast neutrons and preparation of two-dimensional organic-inorganic hybrid perovskite scintillator
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  • Two-dimensional organic-inorganic hybrid perovskite scintillator capable of simultaneously detecting gamma rays and fast neutrons and preparation of two-dimensional organic-inorganic hybrid perovskite scintillator

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preparation example Construction

[0034] The preparation of the scintillator material may include steps such as volatile solvent method, seed crystal induction, and anti-solvent cleaning, and may specifically include the following steps:

[0035] Step 1: PEABr (or BABr, BIBr) and PbBr 2 Dissolve in dimethyl sulfoxide or dimethyl formamide, stir well to form a concentration (based on Pb2 + ions) with a precursor solution of 0.3-3mol / L; if Br is replaced by Cl, PEACl (or BACl, BICl) and / or PbCl should be used accordingly 2 ;

[0036] Step 2: Filter the precursor solution into an open container, seal it with tin foil, pierce the hole and volatilize at room temperature until crystallization;

[0037] Step 3: Filter the crystallization solution into another clean open container, add the precipitated crystals as seed crystals, seal the open container with tin foil, and then poke holes to volatilize, so that the seed crystals continue to grow;

[0038] Step 4: Clean the surface of the grown crystals with an anti-s...

Embodiment 1

[0040] Weigh 4.6077g PEABr and 4.1839g PbBr 2 In 10mL N,N-dimethylformamide, after completely dissolving (1.14mol / L), filter the solution and transfer to a 25mL glass beaker. After putting on tin foil, use a 5mL syringe to pierce 4 small holes on the tin foil, place it at 35°C to evaporate, and PEA will be available within 1 week 2 PbBr 4 Crystals precipitated. Filter the crystallization solution into a new clean 25mL small beaker, and add the precipitated crystals as seed crystals, seal the beaker with tin foil, and tie the tin foil to the outside of the beaker with adhesive tape, and use a 50mL syringe to tie it on the tin foil. One small hole allows the solvent to evaporate slowly at 35°C, and the seed crystal grows continuously. One month later, the crystals (grown seed crystals) were taken out with tweezers, dried with dust-free paper, rinsed with toluene, dried in a vacuum oven (ie, vacuum-dried at room temperature) for 12 hours, and then stored in the dark. figure 1...

Embodiment 2

[0042] Weigh 2.3886g BIBr and 1.1010g PbBr 2 Dissolve in 10mL N,N-dimethylformamide (0.3mol / L). After complete dissolution, filter the solution and transfer to a 50mL glass beaker. After putting on tin foil, use a 5ml syringe to pierce 10 small holes on the tin foil, place it at 15°C to evaporate, and BI will appear within 1 week 2 PbBr 4 Crystals precipitated. Filter the solution into a new clean 50mL small beaker, and add the precipitated crystals as seeds, seal the beaker with tin foil, and tie the tin foil to the outside of the beaker with adhesive tape, and then use a 1mL syringe to pierce the tin foil for 1 A small hole allows the solvent to evaporate slowly at 15°C, and the seed crystal grows continuously. One month later, the crystals (grown seed crystals) were taken out with tweezers, dried with dust-free paper, rinsed with chlorobenzene, dried in a vacuum oven for 12 hours, and stored in the dark. Figure 5 Its fluorescence spectrum, Image 6 Its fluorescence li...

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Abstract

The invention belongs to the technical field of crystal material application, and discloses a two-dimensional organic-inorganic hybrid perovskite scintillator capable of simultaneously detecting gamma rays and fast neutrons and preparation of the two-dimensional organic-inorganic hybrid perovskite scintillator, the chemical formula of the organic-inorganic hybrid perovskite scintillator material is A2PbBr4 or A2PbBr4-xClx, wherein A is a protonated phenylethylamine (PEA) ion, a protonated benzimidazole (BI) ion or a protonated butylamine (BA) ion, x is 0-0.8, and the probe can be applied to detection of fast neutrons or simultaneous detection of gamma rays and fast neutrons. The two-dimensional organic-inorganic hybrid perovskite scintillator material composed of specific elements contains a large number of hydrogen atoms and heavy atoms at the same time, so that under excitation of gamma rays or fast neutrons, the material has high light yield and fast attenuation, and the scintillator is excellent in performance and especially can be used for detecting gamma rays and fast neutrons at the same time.

Description

technical field [0001] The invention belongs to the technical field of crystal material application, and more specifically relates to a two-dimensional organic-inorganic hybrid perovskite scintillator capable of simultaneously detecting gamma rays and fast neutrons and its preparation. The two-dimensional organic-inorganic hybrid perovskite in the present invention The halide perovskite scintillator materials are particularly useful for simultaneous detection of gamma rays and fast neutrons. Background technique [0002] Scintillators are a class of materials that convert high-energy rays (X-rays, γ-rays, charged particles, and neutrons) into detectable visible light, thereby realizing the detection of high-energy rays. When a fast neutron collides with an atom in a substance, the energy obtained by the recoil atom is where A is the mass number of the atom, E n is the energy of the incident fast neutrons, is the recoil angle, it can be seen that the hydrogen atom has th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C09K11/66G01T1/202G01T3/06
CPCC09K11/06C09K11/664G01T3/06G01T1/202C09K2211/1007C09K2211/1044Y02E10/549
Inventor 牛广达唐江谢作想夏梦玲王瀚琪
Owner HUAZHONG UNIV OF SCI & TECH
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