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A method for rapid synthesis of full-spectrum perovskite quantum dots by organic-inorganic assisted ion exchange

A technology of ion exchange and quantum dots, which is applied in the field of rapid synthesis of full-spectrum perovskite quantum dots, can solve the problems of poor stability of perovskite quantum dots, and achieve the effects of easy preparation and operation, convenient operation, and simple equipment

Active Publication Date: 2021-02-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fast Anion-Exchange in Highly Luminescent Nanocrystals of Cesium Lead Halide Perovskites (CsPbX 3 , X = Cl, Br, I) (Nedelcu G, Protesescu L, Yakunin S, et al . 2015, 15(8):5635-5640.) It is reported that adding halogen compounds for ion exchange to synthesize full-spectrum perovskite quantum dots, but the stability of perovskite quantum dots after synthesis is especially purple CsPbCl 3 and red CsPbI 3 poor stability

Method used

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  • A method for rapid synthesis of full-spectrum perovskite quantum dots by organic-inorganic assisted ion exchange
  • A method for rapid synthesis of full-spectrum perovskite quantum dots by organic-inorganic assisted ion exchange
  • A method for rapid synthesis of full-spectrum perovskite quantum dots by organic-inorganic assisted ion exchange

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Effect test

Embodiment 1

[0041] The rapid synthesis of full-spectrum perovskite quantum dots by organic-inorganic assisted ion exchange includes the following steps:

[0042] (1) First heat the multi-channel microreactor to 100°C, and pass nitrogen gas to remove the water vapor inside the channel, and then cool it to room temperature;

[0043](2) Green inorganic perovskite quantum dots CsPbBr with a concentration of 10 mg / ml 3 Toluene solution, green inorganic perovskite quantum dots CsPbBr at a concentration of 10 mg / ml 3 The chloroform solution, the PLA chloroform solution with a mass concentration of 5%, and the LiI isopropanol solution with a concentration of 0.1 mM were respectively loaded into a multi-channel syringe pump;

[0044] Green Inorganic Perovskite Quantum Dots CsPbBr 3 The transmission electron microscope (TEM) image of the toluene solution is shown in figure 1 shown by figure 1 It can be seen that the inorganic perovskite quantum dots CsPbBr in toluene solution 3 For the cubic...

Embodiment 2

[0051] The rapid synthesis of full-spectrum perovskite quantum dots by organic-inorganic assisted ion exchange includes the following steps:

[0052] (1) First heat the multi-channel microreactor to 100 ° C, and pass nitrogen gas to remove the water vapor inside the channel, and then cool it to room temperature;

[0053] (2) Green inorganic perovskite quantum dots CsPbBr with a concentration of 10 mg / ml 3 Toluene solution, green inorganic perovskite quantum dots CsPbBr at a concentration of 10 mg / ml 3 The chloroform solution, the PLA chloroform solution with a mass concentration of 15% and the LiI isopropanol solution with a concentration of 0.4mM are loaded into the multi-channel syringe pump respectively;

[0054] (3) Green inorganic perovskite quantum dots CsPbBr 3 The toluene solution and the PLA solution are injected into the multichannel microreactor at a volume ratio of 15:1, and react during the flow process in the microchannel of the multichannel reactor, and the fl...

Embodiment 3

[0059] The rapid synthesis of full-spectrum perovskite quantum dots by organic-inorganic assisted ion exchange includes the following steps:

[0060] (1) First heat the multi-channel microreactor to 100 ° C, and pass nitrogen gas to remove the water vapor inside the channel, and then cool it to room temperature;

[0061] (2) Green inorganic perovskite quantum dots CsPbBr with a concentration of 10mg / ml 3 Toluene solution, green inorganic perovskite quantum dots CsPbBr with a concentration of 10mg / ml 3 The chloroform solution, the PLA chloroform solution with a mass concentration of 25% and the LiI isopropanol solution with a concentration of 1 mM are loaded into the multi-channel syringe pump respectively;

[0062] (3) Green inorganic perovskite quantum dots CsPbBr 3 The toluene solution and the PLA solution are injected into the multichannel microreactor at a volume ratio of 30:1, and react during the flow process in the microchannel of the multichannel reactor, and the flo...

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Abstract

The invention discloses a method for rapidly synthesizing full-spectrum perovskite quantum dots with organic-inorganic assisted ion exchange. The inventive method uses green inorganic perovskite quantum dot CsPbBr 3 solution as the mother liquor, by injecting CsPbBr into the multi-channel microreactor 3 Solution, organic polymer solution and inorganic salt solution react during the flow process in the microchannel of the multichannel microreactor to obtain full-spectrum perovskite quantum dots of various colors. The quantum dots synthesized by the method of the invention have strong stability, cheap raw materials, convenient operation, and are beneficial to large-scale industrial production.

Description

technical field [0001] The invention relates to the field of synthesis of perovskite quantum dots, in particular to a rapid synthesis method of full-spectrum perovskite quantum dots. Background technique [0002] In recent years, due to its narrow emission spectrum, wide adjustable wavelength range, high fluorescence efficiency, strong photochemical stability, and easy surface modification, perovskite quantum dots have shown great promise in the fields of LEDs, photoelectric sensors, solar cells, and lasers. Great prospects for development. Rapid and efficient preparation of high-quality perovskite quantum dots is the basis for related application research. [0003] At present, the main methods for synthesizing full-spectrum perovskite quantum dots include: high-temperature implantation method and supersaturated crystallization method. The high-temperature injection method requires high temperature, inert gas protection, and long synthesis time; the supersaturated crystall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66B82Y20/00B82Y40/00B01J19/00
CPCB01J19/0093B82Y20/00B82Y40/00C09K11/665
Inventor 汤勇饶龙石李宗涛杜学威卢汉光于佳栋
Owner SOUTH CHINA UNIV OF TECH