Shankar Hari, Bansal Parul, Yu William W, Kar Prasenjit
Department of Chemistry, Indian Institute of Technology, Roorkee, Uttarakhand, 247667, India.
Department of Chemistry and Physics, Louisiana State University, Shreveport, Louisiana, 71115, United States.
Chemistry. 2020 Sep 21;26(53):12242-12248. doi: 10.1002/chem.202002499. Epub 2020 Sep 4.
In the literature, lead halide perovskites are very notable for their degradation in the presence of polar solvents, such as water. In contrast, in this research, it is observed that adding a minor amount of water into the precursor solution can improve the stability and photoluminescence quantum yield of CsPbBr nanocrystals through a ligand-assisted reprecipitation (LARP) method. In this way, the shape and phase transformation from CsPbBr nanoplates to CsPbBr /Cs PbBr nanorods and Cs PbBr nanowires can be controlled with increasing water content in the precursor solution. Upon adding water up to an ideal amount, CsPbBr maintains its phase and nanoplate morphology. The key role of water amount for tuning the crystallinity, stability, morphology, optical properties, and phase transformation of cesium lead halide perovskite nanocrystals will be beneficial in the future commercialization of optoelectronics.
在文献中，卤化铅钙钛矿因其在极性溶剂（如水）存在下的降解而备受关注。相比之下，在本研究中观察到，通过配体辅助再沉淀（LARP）方法向前驱体溶液中加入少量水可以提高CsPbBr纳米晶体的稳定性和光致发光量子产率。通过这种方式，随着前驱体溶液中水含量的增加，可以控制从CsPbBr纳米片到CsPbBr/Cs₂PbBr纳米棒和Cs₃PbBr纳米线的形状和相变。加入适量的水后，CsPbBr保持其相和纳米片形态。水含量对调节卤化铯铅钙钛矿纳米晶体的结晶度、稳定性、形态、光学性质和相变的关键作用将有利于未来光电子学的商业化。
