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Cs4PbBr6/CsPbBr3 perovskite nanocrystalline scintillation powder and preparation method of Cs4PbBr6/CsPbBr3 perovskite nanocrystalline scintillation powder

A nanocrystal and perovskite technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of inability to collect radioactive signals, insufficient energy deposition, and limited material thickness, and achieve strong controllability, Simple preparation method and low cost effect

Active Publication Date: 2020-01-31
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, further studies showed that CsPbBr 3 Due to its large surface area, nanocrystalline materials are easy to deliquesce in the air and have poor stability. Due to the limited thickness of the material and insufficient energy deposition, it is impossible to collect the energy spectrum of the emission signal.

Method used

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  • Cs4PbBr6/CsPbBr3 perovskite nanocrystalline scintillation powder and preparation method of Cs4PbBr6/CsPbBr3 perovskite nanocrystalline scintillation powder
  • Cs4PbBr6/CsPbBr3 perovskite nanocrystalline scintillation powder and preparation method of Cs4PbBr6/CsPbBr3 perovskite nanocrystalline scintillation powder
  • Cs4PbBr6/CsPbBr3 perovskite nanocrystalline scintillation powder and preparation method of Cs4PbBr6/CsPbBr3 perovskite nanocrystalline scintillation powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) 25ml dimethyl sulfoxide is added to the container, and CsBr and PbBr 2 The powder is mixed into the solution according to the ratio of 1mol:1mol;

[0026] (2) Put the solution obtained in step (1) into an oil bath to heat and rotate, the heating temperature is set at 80° C., the rotation speed is 500 rpm, and the rotation time is 30 minutes;

[0027] (3) In the solution prepared in step (2), continue to add the powder added last time (that is, CsBr and PbBr mixed according to the ratio of 1mol:1mol 2 powder), continue to heat and rotate until the solution turns orange-yellow at high temperature;

[0028] (4) Leave the solution prepared in step (3) at room temperature of 20°C for 30 minutes to turn yellow-green;

[0029] (5) The solution prepared in step (4) is placed on the conical flask with a sand core funnel of 2 μm aperture and plugged tightly with a rubber stopper, and the conical flask is connected to a vacuum pump for suction filtration;

[0030] (6) The p...

Embodiment 2

[0033] (1) 25ml dimethyl sulfoxide is added to the container, and CsBr and PbBr 2 The powder is mixed into the solution according to the ratio of 1mol:1.5mol;

[0034] (2) Put the solution obtained in step (1) into an oil bath for heating and rotating, the heating temperature is set at 70° C., the rotating speed is 1000 rpm, and the rotating time is 30 minutes;

[0035] (3) In the solution prepared in step (2), continue to add the powder added last time (that is, CsBr and PbBr mixed according to the ratio of 1mol:1.5mol 2 powder), continue to heat and rotate until the solution turns orange-yellow at high temperature;

[0036](4) Leave the solution prepared in step (3) at room temperature of 22°C for 45 minutes to turn yellow-green;

[0037] (5) The solution prepared in step (4) is placed on the conical flask with a sand core funnel of 2.5 μm aperture and plugged tightly with a rubber stopper, and the conical flask is connected to a vacuum pump for suction filtration;

[003...

Embodiment 3

[0041] (1) 25ml dimethyl sulfoxide is added to the container, and CsBr and PbBr 2 The powder is mixed into the solution according to the ratio of 1mol:0.8mol;

[0042] (2) Put the solution obtained in step (1) into an oil bath for heating and rotating, the heating temperature is set at 75° C., the rotating speed is 1500 rpm, and the rotating time is 30 minutes;

[0043] (3) In the solution prepared in step (2), continue to add the powder added last time (that is, CsBr and PbBr mixed according to the ratio of 1mol:0.8mol 2 powder) repeat step (2), until the solution turns orange at high temperature;

[0044] (4) Put the solution prepared in step (3) at room temperature of 24° C. for 1 hour to turn yellow-green;

[0045] (5) The solution prepared in step (4) is placed on the conical flask with a sand core funnel of 2.5 μm aperture and plugged tightly with a rubber stopper, and the conical flask is connected to a vacuum pump for suction filtration;

[0046] (6) Wash the powder...

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Abstract

The invention discloses Cs4PbBr6 / CsPbBr3 perovskite nanocrystalline scintillation powder and a preparation method of the Cs4PbBr6 / CsPbBr3 perovskite nanocrystalline scintillation powder. According tothe method, the zero-dimensional perovskite nanocrystalline scintillation powder required for radiation field detection can be realized. The method is a method for successfully synthesize the Cs4PbBr6 / CsPbBr3 perovskite nanocrystalline scintillation powder in batch in an organic solvent by utilize a solvothermal method and adjusting parameters such as reactant ratio, reaction temperature, time andthe like. Yellow-green samples synthesized at a certain temperature with organic solvent dimethyl sulfoxide as solvent and solutes CsBr and PbBr2 as solutes are washed, filtered and dried to obtain abright green finished product, namely, the Cs4PbBr6 / CsPbBr3 perovskite nanocrystalline scintillation powder. The preparation method provided by the invention is simple, low in cost, strong in controllability and capable of mass production; and the Cs4PbBr6 / CsPbBr3 perovskite prepared by the method has excellent quantum luminous efficiency, good stability and good thermal recovery characteristics.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanomaterials, in particular to a Cs 4 PbBr 6 / CsPbBr 3 Perovskite nanocrystal scintillation powder and preparation method thereof. Background technique [0002] Nanomaterials play an important role in the field of luminescence and detection due to their large surface-to-volume ratio and obvious quantum effects. In recent years, scintillator materials based on micro-nano materials have been developed to a great extent due to the shortcomings of traditional bulk materials such as difficult preparation and high growth costs. Micro-nano scintillation material powders with high light yield and low cost are widely used in the field of nuclear radiation detection, especially in the field of X-ray imaging. These micro-nano scintillation material powders include nanocrystals based on Pb materials (for example, PbS, PbSe, PbTe ) and inorganic perovskite nanocrystals (for example, CsPbB...

Claims

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Application Information

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IPC IPC(8): C09K11/66C01G21/16B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01G21/16C01P2004/80C09K11/665
Inventor 徐强王隽欧阳晓平
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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