Manganese-doped Cs3Cu2I5 halide scintillator with high light yield

A halide and manganese doping technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of high price, low detection limit, unfavorable commercial application, etc., achieve high stability, simple preparation method, and environmental friendliness Effect

Inactive Publication Date: 2020-10-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to their excellent photoelectric properties, researchers have also begun to explore their application in scintillators and have reported new metal halide scintillators, among which lead halide perovskite scintillators such as CsPbBr 3 Nanocrystal and nanosheet scintillators (Nature, 2018, 561(7721), 88-93; ACS nano, 2019, 13(2), 2520-2525) have tunable emission wavelength, low detection limit, easy preparation, etc. characteristics, but the low light yield due to severe self-absorption and the toxicity of lead severely limit its practical application; tin-based halides such as two-dimensional layered (C 8 h 17 NH 3 ) 2 SnBr 4 Scintillator, Bmpip 2 SnBr 4 Scintillators (ACS Applied Materials & Interfaces, 2020, 12(17), 19797-19804; J Am Chem Soc, 2019, 141(25), 9764-9768) have high quantum yields, but Sn 2+ Easily oxidized to Sn in air 4+
Copper-based halides such as Rb 2 CuBr 3 Scintillator (Adv Mater, 2019., 31(44), 1904711) has the advantages of high stability, high light yield and non-toxicity, but the price of raw material RbBr is very high, so it is not conducive to commercial application

Method used

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  • Manganese-doped Cs3Cu2I5 halide scintillator with high light yield
  • Manganese-doped Cs3Cu2I5 halide scintillator with high light yield
  • Manganese-doped Cs3Cu2I5 halide scintillator with high light yield

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Embodiment 1

[0031] According to the chemical formula Cs 3 Cu 2 I 5According to the stoichiometric ratio of each element in CsI: 0.003mol and CuI: 0.002mol, weigh a certain amount of samples respectively, pour them into a mortar or ball mill jar and grind them thoroughly to obtain a uniform mixture; package the obtained mixture placed in a vacuum quartz tube and placed in a muffle furnace, and calcined at 450 °C for 6 h; after the reaction was completed and naturally cooled to room temperature, the calcined product was taken out and ground to obtain a light white Cs 3 Cu 2 I 5 powder; finally, the above powder was vacuum-dried at 80°C for 24 h to obtain the final scintillator material.

Embodiment 2

[0033] According to the chemical formula Cs 3 Cu 2 I 5 : Mn 2+ The stoichiometric ratio of each element, when the molar weight of manganese ion is 0.03 mol, the molar weight of CsI and CuI is 0.003 mol and 0.019 mol respectively, according to the above molar weight ratio, take a certain amount of sample, pour into mortar or The mixture was fully ground in a ball mill jar to obtain a uniform mixture; the obtained mixture was packaged in a vacuum quartz tube, placed in a muffle furnace, and calcined at 450 °C for 6 h; after the reaction was completed and naturally cooled to room temperature, the Calcination of the product and grinding it yielded pale yellow Cs 3 Cu 2 I 5 : Mn 2+ powder; finally, the above powder was vacuum-dried at 80°C for 24 h to obtain the final scintillator material.

Embodiment 3

[0035] According to the chemical formula Cs 3 Cu 2 I 5 : Mn 2+ The stoichiometric ratio of each element, when the molar weight of manganese ion is 0.05 mol, the molar weight of CsI and CuI is 0.003 mol and 0.019 mol respectively, according to the above molar weight ratio, take a certain amount of sample, pour into mortar or The mixture was fully ground in a ball mill jar to obtain a uniform mixture; the obtained mixture was packaged in a vacuum quartz tube, placed in a muffle furnace, and calcined at 450 °C for 6 h; after the reaction was completed and naturally cooled to room temperature, the Calcination of the product and grinding it yielded pale yellow Cs 3 Cu 2 I 5 : Mn 2+ powder; finally, the above powder was vacuum-dried at 80°C for 24 h to obtain the final scintillator material.

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Abstract

The invention discloses a manganese-doped Cs3Cu2I5 halide scintillator with high light yield. The manganese-doped Cs3Cu2I5 halide scintillator comprises the following steps: fully grinding CsI, CuI and a divalent manganese compound; calcining an obtained mixture; and after the reaction is finished, naturally cooling to room temperature, grinding, and carrying out vacuum drying to obtain the Cs3Cu2I5: Mn < 2 + > halide scintillator. The copper-based halide Cs3Cu2I5: Mn < 2 + > prepared by the method is non-toxic and easy to prepare, has high radiation absorption coefficient, long-wavelength visible light luminescence, high light yield and high stability under continuous X-ray irradiation, and can be applied to X-ray medical imaging equipment, nuclear batteries and the like.

Description

technical field [0001] The invention belongs to the technical field of inorganic semiconductor luminescent materials, in particular to a manganese-doped Cs with high light yield 3 Cu 2 I 5 Preparation method of halide scintillator. Background technique [0002] Among many scintillators, metal halides have become the most widely used scintillator materials due to their high luminous efficiency and radiative luminescence intensity. Traditional alkali metal halide scintillators such as CsI:TI and NaI:TI have high light yield but they are usually synthesized by crystallization at high temperature. Furthermore, due to their fixed transition energy, spectral tunability cannot be achieved (Journal of Applied Physics, 2015, 118(21), 213106; IEEE TRANSACTIONS ONNUCLEAR SCIENCE, 1998). Rare earth doped halides such as LaX 3 : Ce (Journal of Applied Physics, 2006. 99(12), 123520; Applied Physics Letters, 2001, 79(10), 1573-1575) has the advantages of high light yield, short decay ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/61
CPCC09K11/616
Inventor 李晓明陈佳欣杨丹丹
Owner NANJING UNIV OF SCI & TECH
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