材料科学
钙钛矿(结构)
光电子学
发光二极管
量子效率
二极管
配体(生物化学)
碘化物
纳米晶
化学物理
纳米技术
结晶学
无机化学
生物化学
受体
化学
作者
Zhe Liu,Xiaomei Peng,Shiyu Xing,Weidong Qiu,Mengke Li,Chao Shen,Guanwei Sun,Zhi Zhou,Qing Gu,Junrong Pu,Jiaji Yang,Jibin Zhang,Denghui Liu,Chenyang Shen,Jian Qing,Qifan Xue,Hin‐Lap Yip,Dawei Di,Lintao Hou,Zhengjian Qi,Shi‐Jian Su
标识
DOI:10.1002/adom.202201123
摘要
Abstract Quasi‐2D perovskites show great promise for light‐emitting diodes owing to suppressed non‐radiative losses enabled by the energy funneling/cascading nanostructures. However, for red emission quasi‐2D perovskites, these ideal energy landscapes for efficient perovskite light‐emitting diodes (PeLEDs) can rarely be achieved due to detrimental aggregation of the low‐dimensional ligands in perovskite precursors, leading to poor device efficiency and stability. Here, a ligand‐modulated dimensionality control strategy is explored to achieve uniform phase distribution and reduce defect density for efficient light emission. In contrast to the model phenethylammonium iodide 2D ligand, the formation of small‐ n phases can be inhibited by a structurally similar phenoxyethylammonium iodide ligand owing to the weakened aromatic stacking between ligands. Besides, the oxygen atoms can interact with the uncoordinated Pb 2+ ions and promote the NI coordination in the perovskites, which greatly reduces the non‐radiative recombination defects in the ionic lattice. With this simple and effective approach, deep‐red quasi‐2D PeLEDs with record‐high external quantum efficiency of 21.6% and decent operational stability are achieved without the need for additional additives. These results highlight the potential of ligand‐modulated dimensionality control to achieve highly efficient and stable PeLEDs with a facile fabrication process.
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