|
Title
|
|
|
|
Edge stabilization in reduced-dimensional perovskites
| |
|
Author
|
|
|
|
| |
|
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 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. |
| |
|
Language
|
|
|
|
English
| |
|
Source (journal)
|
|
|
|
Nature communications
| |
|
Publication
|
|
|
|
2020
| |
|
ISSN
|
|
|
|
2041-1723
| |
|
DOI
|
|
|
|
10.1038/S41467-019-13944-2
| |
|
Volume/pages
|
|
|
|
11
:1
(2020)
, 9 p.
| |
|
Article Reference
|
|
|
|
170
| |
|
ISI
|
|
|
|
000551458200001
| |
|
Pubmed ID
|
|
|
|
31924790
| |
|
Medium
|
|
|
|
E-only publicatie
| |
|
Full text (Publisher's DOI)
|
|
|
|
| |
|
Full text (open access)
|
|
|
|
| |
|