卤化物
层状结构
发光
材料科学
钙钛矿(结构)
离子
晶体工程
各向异性
吡啶
金属
离子键合
三元运算
纳米技术
化学物理
结晶学
晶体结构
光电子学
无机化学
超分子化学
光学
化学
物理
有机化学
计算机科学
复合材料
冶金
程序设计语言
作者
Xupeng Gao,Qiang Hu,Xin Li,Po Lu,Yuan Zhong,Xinyu Shen,William W. Yu,Min Lu,Zhennan Wu,Yu Shen,Xue Bai,Yu Zhang
标识
DOI:10.1002/admi.202102251
摘要
Abstract The dimension is a leading parameter in customization of unique optoelectronic properties of halide perovskite, while it is still challenging to achieve dimension control beyond the well‐developed composition regulation‐based strategy considering their intrinsic feature of ionic crystal. In this paper, ligands‐directed confinement effect is emphasized in rendering the reduced‐dimensional engineering of halide perovskite, and quasi‐2D (OAm) 2 CsPb 2 Br 7 ( n = 2) nanosheets are obtained by introducing a large amount of metal ions. As a representation, with Mg 2+ participation, the initial adsorption of organic ligands (i.e., OA and OAm) to inorganic components (i.e., [PbBr 6 ] 4− ) is promoted, conferring a ligands‐directed surface reconstruction to form the lamellar structure composed of alternate organic and inorganic layers. Namely, the inorganic–organic lamellar ensemble will play as a soft template, which effectively restricts the growth of [PbBr 6 ] 4− in the c ‐axis direction even after the Cs‐OA injection, thus producing the anisotropic layered perovskite of (OAm) 2 CsPb 2 Br 7 from CsPbBr 3 scenario. Notably, such reduced‐dimensional engineering enables a remarkable luminescence tailoring, of which the deep blue emission centered at 439 nm is achieved. In addition, benefiting from such universal strategy, the luminescence is also dependent on the species of introduced metal ions (e.g., Ca 2+ , Co 2+ , Sr 2+ , and Mn 2+ ).
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