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 Emwas, Petar Todorović, Rafael Quintero-Bermudez, Grant Walters, James Z. Fan, Mengxia Liu, Hairen Tan, Makhsud I. Saidaminov, Liang Gao, Yiying Li, Dalaver H. Anjum, Nini Wei, Jiang Tang, David W. McCamant, Maarten B. J. Roeffaers, Sara Bals, Johan Hofkens, Osman M. Bakr, Zheng-Hong Lu () and Edward H. Sargent ()
Additional contact information
Li Na Quan: University of Toronto
Dongxin Ma: University of Toronto
Yongbiao Zhao: University of Toronto
Oleksandr Voznyy: University of Toronto
Haifeng Yuan: University of Toronto
Eva Bladt: University of Antwerp
Jun Pan: King Abdullah University of Science and Technology (KAUST)
F. Pelayo García de Arquer: University of Toronto
Randy Sabatini: University of Toronto
Zachary Piontkowski: University of Rochester
Abdul-Hamid Emwas: King Abdullah University of Science and Technology
Petar Todorović: University of Toronto
Rafael Quintero-Bermudez: University of Toronto
Grant Walters: University of Toronto
James Z. Fan: University of Toronto
Mengxia Liu: University of Toronto
Hairen Tan: University of Toronto
Makhsud I. Saidaminov: University of Toronto
Liang Gao: University of Toronto
Yiying Li: University of Toronto
Dalaver H. Anjum: King Abdullah University of Science and Technology
Nini Wei: King Abdullah University of Science and Technology
Jiang Tang: Huazhong University of Science and Technology (HUST)
David W. McCamant: University of Rochester
Maarten B. J. Roeffaers: KU Leuven
Sara Bals: University of Antwerp
Johan Hofkens: KU Leuven
Osman M. Bakr: King Abdullah University of Science and Technology (KAUST)
Zheng-Hong Lu: University of Toronto
Edward H. Sargent: University of Toronto

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-019-13944-2

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