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A kind of method for preparing cspbbr3 perovskite nanocrystals at low temperature

A nanocrystalline, low-temperature technology, applied in chemical instruments and methods, lead compounds, inorganic chemistry, etc., can solve the problems of environmental protection and complicated process, and achieve the effect of simple steps and environmental protection in the preparation process

Active Publication Date: 2021-07-16
TAIYUAN UNIV OF TECH
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Problems solved by technology

At present, the most commonly used method for preparing perovskite nanocrystals is the high-temperature solvothermal injection method. In addition, there are methods such as room temperature crystallization and ultrasonic method, but these methods need to remove water from the solvent and carry out in an organic solvent. complex and not environmentally friendly

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  • A kind of method for preparing cspbbr3 perovskite nanocrystals at low temperature
  • A kind of method for preparing cspbbr3 perovskite nanocrystals at low temperature
  • A kind of method for preparing cspbbr3 perovskite nanocrystals at low temperature

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Embodiment Construction

[0015] A further description will be given below for specific embodiments of the present invention.

[0016] A low-temperature preparation of CsPbBr 3 The method for nanocrystals, comprising the steps of:

[0017] A) Dissolve 0.05 mmol of lead bromide, 0.05 mmol of cesium bromide, and 0.15 mmol of dioctyl sulfonate sodium succinate in 10 mL of water, and obtain a uniformly dispersed and dissolved aqueous solution by ultrasonication or heating the solution;

[0018] B) Use the aqueous solution obtained in step A) with liquid nitrogen (the purpose of using liquid nitrogen is to freeze water quickly, and at the same time use the frozen water molecules to limit CsPbBr 3 The growth space of the crystal and thus become a nanocrystal) is quickly frozen for a period of time until the frozen solid appears fluorescent under an ultraviolet lamp, and then freeze-dried by a vacuum freeze dryer to obtain a dry product containing dioctyl succinate sulfonic acid Sodium CsPbBr as Surfactant ...

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Abstract

The invention relates to a high-efficiency preparation of CsPbBr 3 A method for perovskite nanocrystals belongs to the field of preparation of lead halide perovskite nanocrystals. The present invention utilizes water as a solvent through a freeze-drying method to prepare cubic phase CsPbBr with a size of about 11 nm and dioctyl sodium succinate sulfonate as a surfactant. 3 Nanocrystals, and the prepared nanocrystals have strong photoluminescence, which can produce green fluorescence with high color purity when excited by ultraviolet light. The preparation method of the present invention directly uses water as a solvent to prepare CsPbBr 3 Nano crystals are easy to operate, and water is more environmentally friendly than organic solvents. The method of the invention points out a new and effective way for preparing lead halide perovskite nanocrystals.

Description

technical field [0001] The invention relates to the field of preparation of lead halide perovskite nanocrystals, in particular to a new CsPbBr 3 Preparation methods of perovskite nanocrystals. Background technique [0002] Lead halide perovskite nanocrystals have high photoluminescence quantum yield, narrow emission spectrum, tunable spectral range (by adjusting the halide composition), and high photostability, which make them ideal for optoelectronic devices. It has great potential applications, such as light-emitting diodes (LEDs), nano-lasers, photodetectors, phosphors, and solar cells. At present, the most commonly used method for preparing perovskite nanocrystals is the high-temperature solvothermal injection method. In addition, there are methods such as room temperature crystallization and ultrasonic method, but these methods need to remove water from the solvent and carry out in an organic solvent. Complicated and not environmentally friendly. Contents of the inv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G21/00C09K11/66
CPCC01G21/006C01P2002/34C01P2002/72C01P2002/84C01P2004/04C09K11/665
Inventor 赵敏张雪封刘培植曹海亮郭俊杰
Owner TAIYUAN UNIV OF TECH
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