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高稳定性 CsPbBr3 纳米晶的合成与应用

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0856 材料与化工
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0856 材料与化工
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Perovskite nanocrystals have attracted extensive attention in the solar cells, light-emitting diodes, photocatalysis and other fields for their excellent photoelectric properties. Even though remarkable progress has been made in recent years, it is still challengeable to use CsPbBr3 nanocrystals as commercial materials because of the instability of perovskite materials and the high sensitivity to external environment. Therefore, addressing the stability issue is still one of the key scientific topics in the research of perovskite materials at this stage. In order to improve the environmental stability of CsPbBr3 nanocrystals, two different synthesis strategies of perovskite nanocrystals were designed to prepare stable CsPbBr3 perovskite composites from the perspective of inert matrix encapsulation, and the synthesized perovskite materials were applied in photoluminescence diodes and aqueous photocatalysis.

A vapor-phase template method was designed to synthesize CsPbBr3-ZSM-5 composite in situ, and the product possessed both high PL intensity and high environmental stability. The key chemical reaction between PbBr2 vapor and Si-O network in ZSM-5 led to the collapse of initial zeolite structure, realizing effective confinement and encapsulation of CsPbBr3 nanocrystals, and boosting the stability of the nanocrystals under harsh conditions. At the same time, the acquired encapsulation structure possessed the necessary channels for halogen exchange to regulate the halide ratios of CsPbX3-ZSM-5 composites. And the CsPbX3-ZSM-5 composites synthesized on a large scale were applied in white light-emitting diodes (WLEDs).

A novel in-situ post synthetic microencapsulation technology was developed. A thin layer of SiO2 network was grown on the surface of CsPbBr3 nanocrystals, which could take into account both the stability and charge transfer performance of perovskite nanocrystals in water. It was explained that the significance of the surface dynamic equilibrium state of perovskite nanocrystals for post synthesis passivation and the influence of fine regulation of the reaction system on the encapsulation effect. The synthesized perovskite composites were used to degrade Rhodamine B in aqueous phase, which showed the catalytic activity.

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陈曦. 高稳定性 CsPbBr3 纳米晶的合成与应用[D]. 深圳. 南方科技大学,2022.
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