期刊
NATURE COMMUNICATIONS
卷 11, 期 1, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-019-13944-2
关键词
-
资金
- King Abdullah University of Science and Technology (KAUST) [KUS-11-009-21]
- Ontario Research Fund Research Excellence Program
- Ontario Research Fund (ORF)
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- US Department of Navy, Office of Naval Research [N00014-17-12524]
- Research Foundation-Flanders (FWO Vlaanderen)
- European Research Council (ERC) [815128-REALNANO]
- Research Foundation-Flanders (FWO) [G.0962.13, G.0B39.15, AKUL/11/14, G0H6316N]
- KU Leuven Research Fund [C14/15/053]
- European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement [307523]
- Southern Ontario Smart Computing Innovation Platform (SOSCIP)
- Banting Postdoctoral Fellowship program from the Natural Sciences and Engineering Research Council of Canada (NSERC)
- Netherlands Organisation for Scientific Research (NWO) [680-50-1511]
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 x 10(4) 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据