Liang Xiao, Chen Mei, Wang Qian, Guo Shaojun, Yang Huai
Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing, 100871, China.
BIC-ESAT, College of Engineering, Peking University, Beijing, 100871, China.
Angew Chem Int Ed Engl. 2019 Feb 25;58(9):2799-2803. doi: 10.1002/anie.201814547. Epub 2019 Jan 25.
Perovskite nanocrystals (PNCs) are emerging luminescent materials due to their fascinating physic-optical properties. However, their sensitive surface chemistry with organic polar solvents, oxygen, and moisture greatly hinders their developments towards practical applications. Herein we promote silica-passivated PNCs (SP-PNCs) by in situ hydrolyzing the surface ligands of (3-aminopropyl) triethoxysilane. The resultant SP-PNCs possesses a high quantum yield (QY) of 80 % and are precipitable by polar solvents, such as ethanol and acetone, without destroying their surface chemistry or losing QY, which offers an eco-friendly and efficient method for separation, purification, and phase transfer of PNCs. Moreover, we further promoted a swelling-deswelling encapsulation process to incorporate the as-made SP-PNCs into non-crosslinked polystyrene microspheres (PMs), which can largely increase the stability of the SP-PNCs against moisture for long-term storage.
钙钛矿纳米晶体（PNCs）因其迷人的物理光学性质而成为新兴的发光材料。然而，它们与有机极性溶剂、氧气和水分的敏感表面化学性质极大地阻碍了它们向实际应用的发展。在此，我们通过原位水解（3-氨丙基）三乙氧基硅烷的表面配体来制备二氧化硅钝化的PNCs（SP-PNCs）。所得的SP-PNCs具有80%的高量子产率（QY），并且可被乙醇和丙酮等极性溶剂沉淀，而不会破坏其表面化学性质或损失QY，这为PNCs的分离、纯化和相转移提供了一种环保且高效的方法。此外，我们进一步推进了溶胀-去溶胀封装过程，将制备好的SP-PNCs纳入非交联聚苯乙烯微球（PMs）中，这可以大大提高SP-PNCs在长期储存时对水分的稳定性。
