Details

Autor(en) / Beteiligte

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

Titel

Edge stabilization in reduced-dimensional perovskites

Ist Teil von

• Nature communications, 2020-01, Vol.11 (1), p.170-170, Article 170

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 ; their maximum luminance is 4.5 × 10  cd m (corresponding to an EQE of 5%); and, at 4000 cd m , they achieve an operational half-lifetime of 3.5 h.