Method for preparing one-dimensional luminescent ultrafine CsPbBr3 perovskite nano-wires

A perovskite and nanowire technology, applied in the field of nano-luminescent material preparation, can solve the problems of difficult to control reaction time nucleation rate, unsatisfactory product optical properties, low product comparability, etc., achieving excellent luminescent properties, less defects, Surface complete effect

Active Publication Date: 2018-10-19
SHANDONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

For example, although Manna et al. reported the synthesis of nanowires (3.4-23nm) of different widths by adjusting ligands and experimental conditions, the nanowires changed from strong quantum confinement effect to no quantum confinement effect (Chem.Mater.2016,28,6450- 6454), but the traditional thermal injection route experiment process is cumbersome, and the reaction time and nucleation rate are difficult to control, so that the comparability of different batches of products is not high, which limits the CsPbBr 3 Study on Quantum Confinement Effect of Nanowires
In addition, although Polavarapu et al. synthesized CsPbBr in one step by sonication 3 Nanowires, but it is difficult to adjust their size, and the length is only a few hundred nanometers (Angew.Chem.Int.Ed.201707224)
Ultrafine CsPbBr with a diameter of 2.6 nm was prepared by supersaturated crystallization at room temperature by Stratakis et al. 3 Nanowires, but the optical properties of the product are not ideal, and high temperature treatment is required to obtain better fluorescence quantum efficiency (Nanoscale 2017, 9, 18202-18207)

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  • Method for preparing one-dimensional luminescent ultrafine CsPbBr3 perovskite nano-wires
  • Method for preparing one-dimensional luminescent ultrafine CsPbBr3 perovskite nano-wires
  • Method for preparing one-dimensional luminescent ultrafine CsPbBr3 perovskite nano-wires

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Embodiment 1

[0037]A One-dimensional Luminescent Ultrafine CsPbBr 3 A method for preparing perovskite nanowires, comprising the following steps:

[0038] In a constant temperature water bath at 20°C, weigh 7.8g of acetone, 0.89g of oleic acid and 0.41g of oleylamine, add them into a 25mL three-neck flask with a condenser, stir until the reaction solution is clear and transparent, and accurately weigh 0.1468g of PbBr 2 and 0.0852g CsBr into a three-necked flask. at 2000r·min -1 centrifuged after 6 hours of reaction, the centrifuge speed is 6500r·min -1 , and the time is 5 minutes. After separation, the lower layer precipitated as the product CsPbBr 3 , the yield was 92%.

[0039] The present embodiment product CsPbBr 3 After drying in vacuum at 80°C, carry out XRD characterization, the results are as follows figure 1 shown by figure 1 Known embodiment 1 product is CsPbBr 3 .

[0040] The present embodiment product CsPbBr 3 After being dispersed in toluene, it was characterized by...

Embodiment 2

[0043] A One-dimensional Luminescent Ultrafine CsPbBr 3 A method for preparing perovskite nanowires, comprising the following steps:

[0044] In a constant temperature water bath at 40°C, weigh 7.8g of acetone, 0.89g of oleic acid and 0.41g of oleylamine, add them into a 25mL three-neck flask with a condenser, stir until the reaction solution is clear and transparent, and accurately weigh 0.1468g of PbBr 2 and 0.0852g CsBr into a three-necked bottle. at 2000r·min -1 centrifuged after 4 hours of reaction, the centrifuge speed is 6500r min -1 , and the time is 5 minutes. After separation, the lower layer was precipitated to obtain the product CsPbBr 3 , and the yield was 87%.

[0045] The present embodiment product CsPbBr 3 After being dispersed in toluene, it was characterized by TEM, and its morphology features are as follows: Figure 5 shown by Figure 5 It can be seen that nanowires can be formed at this time, with a small amount of other morphological impurities, an...

Embodiment 3

[0047] A One-dimensional Luminescent Ultrafine CsPbBr 3 A method for preparing perovskite nanowires, comprising the following steps:

[0048] In a constant temperature water bath at 50°C, weigh 7.8g of acetone, 0.89g of oleic acid, and 0.41g of oleylamine, add them to a 25mL three-necked flask with a condenser, stir until the reaction solution is clear, and accurately weigh 0.1468g of PbBr 2 and 0.0852g CsBr into a three-necked bottle. at 2000r·min -1 centrifuged after 4 hours of reaction, the centrifuge speed is 6500r min -1 , and the time is 5 minutes. After separation, the lower layer was precipitated to obtain the product CsPbBr 3 , the yield was 80%.

[0049] The present embodiment product CsPbBr 3 After being dispersed in toluene, it was characterized by TEM, and its morphology features are as follows: Figure 6 shown by Figure 6 It can be seen that nanowires with uniform morphology can be formed at this time, with an average of 32.0 nm.

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Abstract

The invention relates to a method for preparing one-dimensional luminescent ultrafine CsPbBr3 perovskite nano-wires. The method comprises the following steps: mixing a surfactant A, a surfactant B anda solvent in water bath with a certain temperature, carrying out uniform stirring so as to obtain a settled solution, then, adding reactants, i.e., PbBr2 and CsBr, carrying out a reaction at a certain revolution rate, and carrying out centrifugal separation after the reaction ends up, thereby obtaining lower-layer precipitates, i.e., the CsPbBr3 perovskite nano-wires. According to the method, thediameter-controllable CsPbBr3 nano-wires with very high purity can be prepared in one step without later stage purification at room temperature without any gas protection. The nano-wires prepared bythe method have the advantages of relatively complete surface, few defects and the like, electrons and holes can be effectively and directly combined to emit light, excellent light emitting propertiesare shown, and the nano-wires have higher quantum yield and are hopefully applied to optical devices such as next-generation full-inorganic perovskite LED, optical detectors, lasers and the like.

Description

technical field [0001] The invention relates to a one-dimensional luminous ultrafine CsPbBr 3 The invention discloses a method for preparing perovskite nanowires, which belongs to the technical field of preparation of nano light-emitting materials. Background technique [0002] In recent years, CsPbX 3 Nanocrystals have become a promising alternative to CH due to their high quantum yield, good stability, and controllable morphology. 3 NH 3 wxya 3 Novel materials of organic-inorganic hybrid perovskites. Like other colloidal nanocrystals, especially when the size is smaller than its exciton Bohr diameter, CsPbX 3 The optical and electrical properties of nanocrystals are highly related to their size and morphology. Controlled synthesis of high-quality and shape-controllable nanomaterials is not only beneficial to basic research, but also offers broad prospects for practical applications. For example, the development of zero-dimensional quantum dots, one-dimensional nanow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G21/00B82Y40/00
CPCC01G21/006C01P2002/34C01P2002/72C01P2002/84C01P2004/04C01P2004/16C01P2004/64
Inventor 王挺陈代荣焦秀玲刘艺
Owner SHANDONG UNIV
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