质子转移诱导的3D/2D混合钙钛矿抑制离子迁移并减少亮度过冲。
Proton-transfer-induced 3D/2D hybrid perovskites suppress ion migration and reduce luminance overshoot.
作者信息
Kim Hobeom, Kim Joo Sung, Heo Jung-Min, Pei Mingyuan, Park In-Hyeok, Liu Zhun, Yun Hyung Joong, Park Min-Ho, Jeong Su-Hun, Kim Young-Hoon, Park Jin-Woo, Oveisi Emad, Nagane Satyawan, Sadhanala Aditya, Zhang Lijun, Kweon Jin Jung, Lee Sung Keun, Yang Hoichang, Jang Hyun Myung, Friend Richard H, Loh Kian Ping, Nazeeruddin Mohammad Khaja, Park Nam-Gyu, Lee Tae-Woo
机构信息
Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, Republic of Korea.
Department of Chemical Engineering, Inha University, Incheon, 22212, Republic of Korea.
出版信息
Nat Commun. 2020 Jul 6;11(1):3378. doi: 10.1038/s41467-020-17072-0.
Perovskite light-emitting diodes (PeLEDs) based on three-dimensional (3D) polycrystalline perovskites suffer from ion migration, which causes overshoot of luminance over time during operation and reduces its operational lifetime. Here, we demonstrate 3D/2D hybrid PeLEDs with extremely reduced luminance overshoot and 21 times longer operational lifetime than 3D PeLEDs. The luminance overshoot ratio of 3D/2D hybrid PeLED is only 7.4% which is greatly lower than that of 3D PeLED (150.4%). The 3D/2D hybrid perovskite is obtained by adding a small amount of neutral benzylamine to methylammonium lead bromide, which induces a proton transfer from methylammonium to benzylamine and enables crystallization of 2D perovskite without destroying the 3D phase. Benzylammonium in the perovskite lattice suppresses formation of deep-trap states and ion migration, thereby enhances both operating stability and luminous efficiency based on its retardation effect in reorientation.
基于三维（3D）多晶钙钛矿的钙钛矿发光二极管（PeLEDs）存在离子迁移问题，这会导致器件在运行过程中亮度随时间出现过冲现象，并缩短其工作寿命。在此，我们展示了一种3D/2D混合PeLED，其亮度过冲现象极大减少，工作寿命比3D PeLED长21倍。3D/2D混合PeLED的亮度过冲率仅为7.4%，远低于3D PeLED的150.4%。通过向甲基溴化铅中添加少量中性苄胺获得3D/2D混合钙钛矿，这会引发质子从甲铵转移至苄胺，并使二维钙钛矿结晶，同时不破坏三维相。钙钛矿晶格中的苄铵抑制了深陷阱态的形成和离子迁移，从而基于其在重取向中的延迟效应提高了操作稳定性和发光效率。
Zotero 插件