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 LiDalaver H. Anjum, Nini Wei, Jiang Tang, David W. McCamant, Maarten B.J. Roeffaers, Sara Bals, Johan Hofkens, Osman M. Bakr, Zheng Hong Lu, Edward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

151 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)
Article number170
JournalNature communications
Volume11
Issue number1
DOIs
StatePublished - Dec 1 2020

ASJC Scopus subject areas

  • General Physics and Astronomy
  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology

Fingerprint

Dive into the research topics of 'Edge stabilization in reduced-dimensional perovskites'. Together they form a unique fingerprint.

Cite this