摘要
全无机铯铅卤钙钛矿CsPbX3(X=Cl,Br,I)纳米晶具有荧光量子产率高、发射光谱范围窄、带隙可调、色域广及制备方法简单等一系列性能优势,因此,这类钙钛矿纳米晶在高色纯度的光电显示器件领域极具应用潜力.然而,该类纳米晶在加热、光照或与极性溶剂接触时极易发生聚集、分解而导致荧光淬灭,大大限制了其在光电器件方面的应用.所以,如何提高全无机铯铅卤钙钛矿纳米晶的光、热及在极性溶剂环境中的稳定性是目前该研究方向亟待解决的关键问题.基于此,已有许多科研工作者致力于该方面的工作,并获得了一些卓有成效的研究成果.本文将主要从二氧化硅包覆、表面处理、构建核壳结构、与聚合物复合、以及离子掺杂几个方面来对提高全无机铯铅卤钙钛矿纳米晶稳定性的研究进行简要的概括和综述.
In recent years,the all inorganic caesium lead halide perovskite nanocrystals(NCs),namely CsPbX3(X=Cl,Br,I),have been successfully developed,because of their high photoluminescence quantum yield,narrow emission spectrum,adjustable emitting wavelength,and the advantages of wide color gamut.They have been received much attention from the global academic and industry researchers and have a great application prospect in the field of photoelectric display devices with high color purity.However,the fluorescence quenching usually occurs when CsPbX3 NCs is heated,irradiated,or in contact with polar solvents because of aggregation and decomposition,which limites its application in photoelectric display devices.Therefore,it becomes a key research direction for scientists how to enhance thermal stability,photostability,and environmental stability for CsPbX3 NCs.Many researchers have done a lot of works on this aspect,and have obtained some remarkable results.In this paper,a brief review for researches on improving the stability of inorganic perovskite nanocrystals will be given from the following aspects:silica coating,surface treatment,construction of core-shell structure,polymer composite and ion doping.
引文
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