温州大学潘跃晓团队报道了极性介质中4-溴丁酸辅助超稳定全无机卤化物钙钛矿CsPbX3量子点的原位钝化策略。相关研究成果发表在2022年3月16日出版的《德国应用化学》。

一个关键的挑战是为钙钛矿CsPbX3（CPX，X=Cl，Br和I）量子点（QDs）开发一种原位钝化策略，以提高其在极性溶剂中的稳定性，同时在不使用复杂有机物的情况下保持其光学性能。

该文中，研究人员描述了一种简单的方法，通过在极性溶剂中4-溴丁酸（BBA）和油胺（OLA）的联合作用，通过原位结晶显著提高CPX量子点的稳定性，并提出了一种可能的基本机制。在水中获得的单分散CsPbBr3（CPB）量子点显示出86.4%的高光致发光量子产率（PLQYs），其在水中分散96小时后的发光特性没有显著变化，这意味着它们的结构没有变化。

该结果为合成所有无机钙钛矿结构的CPX量子点提供了一种可行的设计策略，具有很强的抗极性溶剂攻击的稳定性，并为其表面化学提供了更多的信息。

附：英文原文

Title: 4-Bromo-Butyric Acid-Assisted In Situ Passivation Strategy for Superstable All-Inorganic Halide Perovskite CsPbX3 Quantum Dots in Polar Media

Author: Yuexiao Pan, Hong Zhu, Chengdong Peng, Hongzhou Lian, Jun Lin

Issue&Volume: 2022-03-16

Abstract: A crucial challenge is to develop an in situ passivation strategy for perovskite CsPbX  3  (CPX, X = Cl, Br, and I) quantum dots (QDs) to improve their stability in polar solvents and simultaneously maintaining their optical performance without using complicated organics. Here, we describe a facile method to significantly improve the stability of the CPX QDs via in situ crystallization with combined effects of 4-bromo-butyric acid (BBA) and oleylamine (OLA) in polar solvents and also propose a possible fundamental mechanism. Monodispersed CsPbBr  3  (CPB) QDs obtained in water show high photoluminescence quantum yields (PLQYs) of 86.4% and their PL features of CPB QDs have no significant change after being dispersed in water for 96 h，which implies that their structures are unchanged. The results provide a viable design strategy to synthesize all-inorganic perovskites CPX QDs with strong stability against the attack of polar solvents and shed more light on their surface chemistry.

DOI: 10.1002/anie.202116702

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202116702