Edge stabilization in reduced-dimensional perovskites.

Li Na Quan, Dongxin Ma, Yongbiao Zhao, Oleksandr Voznyy, Haifeng Yuan, Eva Bladt, Jun Pan, F Pelayo García de Arquer, Randy Sabatini, Zachary Piontkowski, Abdul-Hamid M. Emwas, Petar Todorović, Rafael Quintero-Bermudez, Grant Walters, James Z Fan, Mengxia Liu, Hairen Tan, Makhsud I Saidaminov, Liang Gao, Yiying LiDalaver H. Anjum, Nini Wei, Jiang Tang, David W McCamant, Maarten B J Roeffaers, Sara Bals, Johan Hofkens, Osman Bakr, Zhenghong Lu, E. Sargent

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Reduced-dimensional perovskites are attractive light-emitting materials due to their efficient luminescence, color purity, tunable bandgap, and structural diversity. A major limitation in perovskite light-emitting diodes is their limited operational stability. Here we demonstrate that rapid photodegradation arises from edge-initiated photooxidation, wherein oxidative attack is powered by photogenerated and electrically-injected carriers that diffuse to the nanoplatelet edges and produce superoxide. We report an edge-stabilization strategy wherein phosphine oxides passivate unsaturated lead sites during perovskite crystallization. With this approach, we synthesize reduced-dimensional perovskites that exhibit 97 ± 3% photoluminescence quantum yields and stabilities that exceed 300 h upon continuous illumination in an air ambient. We achieve green-emitting devices with a peak external quantum efficiency (EQE) of 14% at 1000 cd m-2; their maximum luminance is 4.5 × 104 cd m-2 (corresponding to an EQE of 5%); and, at 4000 cd m-2, they achieve an operational half-lifetime of 3.5 h.
Original languageEnglish (US)
JournalNature communications
Volume11
Issue number1
DOIs
StatePublished - Jan 10 2020

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