Kim, HobeomKim, Joo SungHeo, Jung-MinPei, MingyuanPark, In-HyeokLiu, ZhunYun, Hyung JoongPark, Min-HoJeong, Su-HunKim, Young-HoonPark, Jin-WooOveisi, EmadNagane, SatyawanSadhanala, AdityaZhang, LijunKweon, Jin JungLee, Sung KeunYang, HoichangJang, Hyun MyungFriend, Richard H.Loh, Kian PingNazeeruddin, Mohammad KhajaPark, Nam-GyuLee, Tae-Woo2020-08-052020-08-052020-08-052020-07-0610.1038/s41467-020-17072-0https://infoscience.epfl.ch/handle/20.500.14299/170623WOS:000550671200004Perovskite 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.Multidisciplinary SciencesScience & Technology - Other Topicslight-emitting-diodeshalide perovskitesolar-cellsefficiencyhysteresistext::journal::journal article::research article