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Abstract：
Perovskite light-emitting diodes (LEDs) are attracting great attention due to their efficient and narrow emission. Quasi-two-dimensional perovskites with Ruddlesden-Popper-type layered structures can enlarge exciton binding energy and confine charge carriers and are considered good candidate materials for efficient LEDs. However, these materials usually contain a mixture of phases and the phase impurity could cause low emission efficiency. In addition, converting three-dimensional into quasi-two-dimensional perovskite introduces more defects on the surface or at the grain boundaries due to the reduction of crystal sizes. Both factors limit the emission efficiency of LEDs. Here, firstly, through composition and phase engineering, optimal quasi-two-dimensional perovskites are selected. Secondly, surface passivation is carried out by coating organic small molecule trioctylphosphine oxide on the perovskite thin film surface. Accordingly, green LEDs based on quasi-two-dimensional perovskite reach a current efficiency of 62.4 cd A(-1) and external quantum efficiency of 14.36%.
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NATURE COMMUNICATIONS
ISSN： 2041-1723
Year： 2018
Volume： 9
1 6 . 6 0 0
JCR@2022
ESI Discipline： Multidisciplinary;
ESI HC Threshold：337
JCR Journal Grade：1
Cited Count：
WoS CC Cited Count： 908
SCOPUS Cited Count： 905
ESI Highly Cited Papers on the List： 40 Unfold All
WanFang Cited Count：
Chinese Cited Count：
30 Days PV： 7
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