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Halogenated perovskite quantum dot composite material for neutron detection and preparation method thereof

A composite material and calcium halide technology, applied in the field of radiation detection, can solve the problems of large-volume preparation and harsh use conditions, low light yield and energy resolution, complex preparation process, etc., and achieve excellent scintillation performance, low cost, and preparation The effect of simple process

Pending Publication Date: 2021-04-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Crystal materials have excellent scintillation performance, but they have the disadvantages of high price, incapable of large-scale preparation and harsh use conditions; while Ce 3+ doped rich 6 Li glass materials are limited by the complex preparation process, low light yield and low energy resolution; in addition, ZnS:Ag / 6 LiF( 10 B 2 o 3 ) due to opacity and serious scattering, the thickness of the sample is greatly limited (~1mm)

Method used

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  • Halogenated perovskite quantum dot composite material for neutron detection and preparation method thereof
  • Halogenated perovskite quantum dot composite material for neutron detection and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0051] Example 1 Rich 10 B-CsPbBr 3 Halide Perovskite Composite Inorganic Glass Material Bulk

[0052] The first step: the stoichiometric ratio (molar ratio) design of the composite material, its specific component is B 2 o 3 : SiO 2 : ZnO: SrO: CsO: PbO: NaBr (mol%) = 52: 21: 6: 5: 7: 3: 6, with SiO 2 、H 10 BO 3 , ZnO, SrCO 3 、CsCO 3 , PbO: NaBr is used as the raw material, weighed and ground evenly according to the components, then melted at a high temperature of 1050 ° C for 20 minutes, and quenched in a mold to prepare a glass block precursor.

[0053] Step 2: The prepared glass is subjected to secondary heat treatment in a box-type muffle furnace. The holding temperature is 450°C, the holding time is 8h, and the heating rate is 5°C / min. Then the glass sample is cooled to room temperature and taken out to obtain the required CsPbBr 3 Halide perovskite composite inorganic glass material bulk.

[0054] The CsPbBr that embodiment 1 prepares 3 The block sample of h...

Embodiment 2

[0056] Example 2 Rich 6 CH of Li 3 NH 3 PbBr 3 Halide perovskite composite organic polymer material bulk

[0057] Step 1: CH 3 NH 3 PbBr 3 Synthesis of Perovskite Quantum Dot Precursor Solution, CH 3 NH 2 Stir with 0.5mol / L HBr solution at a molar ratio of 1:1 at 0°C until the solution is clear, then place the solution in an oil bath and heat it to 70°C, and let it stand for 12 hours, then filter to obtain a light yellow color Precipitate. After the precipitate was repeatedly washed with absolute ethanol, it was recrystallized with anhydrous ether, and the obtained white crystal was vacuum-dried at a temperature of 50 degrees Celsius for 12 hours to obtain the desired CH 3 NH 3 Br. Then 11.2 g of CH 3 NH 3 Br with 29.4g of PbBr 2 The molar ratio is 5:4, mixed and dissolved in N,N-dimethylformamide ethanol solvent with a volume of 200ml, stirred and heated to 70°C, the stirring time is 120min, and the prepared target CH 3 NH3 PbBr 3 Perovskite quantum dot precur...

Embodiment 3

[0061] Example 3 Rich 10 B-CsPbI 3 Halide perovskite composite inorganic glass material optical fiber

[0062] The first step: the stoichiometric ratio (molar ratio) design of the composite material, its specific component is B 2 o 3 : SiO 2 : ZnO: SrO: CsO: PbO: NaI (mol%) = 52: 21: 6: 5: 7: 3: 6, with SiO 2 、H 10 BO 3 , ZnO, SrCO 3 、CsCO 3 , PbO:NaI was used as the raw material, weighed and ground evenly according to the components, and then melted at a high temperature of 1050°C for 20 minutes, quenched in a mold to prepare a glass block precursor, and then annealed in a muffle furnace for 5 hours, and the temperature was set at 350°C.

[0063] The second step: the prepared glass is turned and processed, combined with the quartz glass sleeve and placed in the drawing tower. The temperature of the drawing tower is 900°C, the drawing speed is 40m / °C, the inner diameter of the optical fiber sleeve is 3cm, the outer diameter is 30cm, and the core layer- The cladding ra...

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Abstract

The invention belongs to the technical field of radiation detection, and discloses a halogenated perovskite quantum dot composite material for neutron detection and a preparation method thereof. The composite material is prepared from an organic polymer or inorganic glass matrix composite perovskite halide quantum dot material with high neutron interception capability. The matrix with high neutron interception capability can intercept incident neutrons and convert the neutrons into secondary charged particles so as to excite the doped halogenated perovskite quantum dots to flicker and emit light. Compared with a traditional neutron detection material, the composite material has the advantages of being low in cost, capable of preparing large-size samples, excellent in scintillation performance and the like, and the prepared composite material can be applied to the fields of neutron safety detection, oil well exploration, neutron treatment, high-energy physical experiments and the like.

Description

technical field [0001] The invention belongs to the technical field of radiation detection, and in particular relates to a halide perovskite quantum dot composite material for neutron detection and a preparation method thereof. Background technique [0002] Neutrons are uncharged, neutral particles with strong penetrating power, and are of great value and significance in the fields of high-energy physics, aerospace, radiation safety, and material testing. However, the neutrality of neutrons prevents them from ionizing objects when they interact with matter, making it difficult to detect them directly by conventional means. Accurate and efficient detection of neutrons is a necessary condition for promoting their related applications. The nuclear reaction method is one of the most common means of neutron detection, by doping the material with elements with high neutron interception area, such as 6 Li, 10 Elements such as B, these elements react with incident neutron nuclei t...

Claims

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Application Information

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IPC IPC(8): G01T3/06C09K11/06C09K11/66C09K11/02
Inventor 周时凤林梓宇唐俊州吕时超杜观昕杨中民邱建荣
Owner SOUTH CHINA UNIV OF TECH
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