Zhu Hong, Pan Yuexiao, Peng Chengdong, Lian Hongzhou, Lin Jun
Nanomaterials and Chemistry Key Laboratory, Faculty of Chemistry and Materials Engineering, Wenzhou University, Zhejiang Province, Wenzhou, 325027, P. R. China.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
Angew Chem Int Ed Engl. 2022 May 23;61(22):e202116702. doi: 10.1002/anie.202116702. Epub 2022 Mar 25.
A crucial challenge is to develop an in situ passivation treatment strategy for CsPbX (CPX, X=Cl, Br, and I) quantum dots (QDs) and simultaneously retain their luminous efficiency and wavelength. Here, a facile method to significantly improve the stability of the CPX QDs via in situ crystallization with the synergistic effect of 4-bromo-butyric acid (BBA) and oleylamine (OLA) in polar solvents including aqueous solution and a possible fundamental mechanism are proposed. Monodispersed CsPbBr (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 aqueous solution for 96 h, which implies the structure of CPB QDs is unchanged. The results provide a viable design strategy to synthesize all-inorganic perovskite CPX QDs with strong stability against the attack of polar solvents and shed more light on their surface chemistry.
一个关键挑战是为CsPbX（CPX，X = Cl、Br和I）量子点（QD）开发一种原位钝化处理策略，同时保持其发光效率和波长。在此，提出了一种简便方法，通过在包括水溶液在内的极性溶剂中利用4-溴丁酸（BBA）和油胺（OLA）的协同效应进行原位结晶，显著提高CPX量子点的稳定性以及一种可能的基本机制。在水中获得的单分散CsPbBr（CPB）量子点显示出86.4%的高光致发光量子产率（PLQY），并且在分散于水溶液中96小时后，CPB量子点的PL特性没有显著变化，这意味着CPB量子点的结构未改变。这些结果为合成对极性溶剂攻击具有强稳定性的全无机钙钛矿CPX量子点提供了一种可行的设计策略，并为其表面化学提供了更多见解。
