材料科学
钝化
自组装
配体(生物化学)
纳米晶
钙钛矿(结构)
溴化物
分子间力
卤化物
激子
光化学
光电子学
纳米技术
化学工程
无机化学
结晶学
化学
分子
有机化学
图层(电子)
受体
工程类
物理
量子力学
生物化学
作者
Zhuoying Yang,Shaomin Peng,Ying Wu,Xiwen Ma,Ming Sun,Wei Song,Longmeng Wei,Ben Ma,Guichuan Xing,Lin Yu
标识
DOI:10.1021/acs.jpcc.3c06082
摘要
Ultrathin pure bromide metal halide perovskite nanoplatelets (MHP NPLs) are expected to achieve high-purity pure blue and even deep blue emission. However, the optical properties of ultrathin NPLs are extremely unstable because they tend to self-assemble and fuse into large particles. Here, we find that the deep blue emitting NPLs can be stabilized by controlling the self-assembly behavior. By partial exchange of the surface ligand of aliphatic acid with aromatic acid, the self-assembly configuration can be effectively controlled, endowing stable face-to-face self-assembled configurations. The resultant NPL superlattices can retain blue emission for over half a month, while the control samples will red-shift within a few hours. The molecular simulation results reveal that the aromatic acid ligand has a strong passivation capacity on the NPL surface and moderate intermolecular van der Waals interactions. Therefore, by tuning the benzoic acid concentration, the intrinsic optical properties of individual NPLs can be stabilized in the form of self-assembly, avoiding crystal regrowth and exciton delocalization. This controllable self-assembly of ultrathin MHP NPLs benefits fundamental research in the field of perovskite nanocrystal superlattices and broadens the possibilities for perovskites for blue emission.
科研通智能强力驱动
Strongly Powered by AbleSci AI