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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Na Quan L,Ma D,Zhao Y,Voznyy O,Yuan H,Bladt E,Pan J,García de Arquer FP,Sabatini R,Piontkowski Z,Emwas AH,Todorović P,Quintero-Bermudez R,Walters G,Fan JZ,Liu M,Tan H,Saidaminov MI,Gao L,Li Y,Anjum DH,Wei N,Tadoi
10.1038/s41467-019-13944-2subject
Has Abstractpub_date
2020-01-10 00:00:00pages
170issue
1issn
2041-1723pii
10.1038/s41467-019-13944-2journal_volume
11pub_type
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