卤化物
光致发光
钙钛矿(结构)
甲胺
水溶液
纳米晶
量子产额
离子键合
材料科学
光化学
无机化学
化学
纳米技术
离子
物理化学
结晶学
有机化学
光电子学
物理
荧光
量子力学
作者
Chong Geng,Shu Xu,Haizheng Zhong,Andrey L. Rogach,Wengang Bi
标识
DOI:10.1002/anie.201802670
摘要
Methylammonium lead halide perovskite nanocrystals offer attractive optoelectronic properties but suffer from fast degradation in the presence of water. In contradiction to this observation, we demonstrate the possibility of a direct aqueous synthesis of CH3 NH3 PbX3 (X=Br or Cl/Br) nanocrystals through the reaction between the lead halide complex and methylamine when the pH is maintained in the range of 0-5. Under these synthetic conditions, the positively charged surface of the perovskite nanocrystals and the proper ionic balance help to prevent their decomposition in water. Additional surface capping with organic amine ligands further improves the photoluminescence quantum yield of the perovskite nanocrystals to values close to 40 %, ensures their stability under ambient conditions for several months, and their photoluminescence performance under continuous 0.1 W mm-2 405 nm light irradiation for over 250 hours.
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