Skip to main content
eScholarship
Open Access Publications from the University of California

Efficient metal halide perovskite light-emitting diodes with significantly improved light extraction on nanophotonic substrates.

  • Author(s): Zhang, Qianpeng
  • Tavakoli, Mohammad Mahdi
  • Gu, Leilei
  • Zhang, Daquan
  • Tang, Lei
  • Gao, Yuan
  • Guo, Ji
  • Lin, Yuanjing
  • Leung, Siu-Fung
  • Poddar, Swapnadeep
  • Fu, Yu
  • Fan, Zhiyong
  • et al.
Abstract

Metal halide perovskite has emerged as a promising material for light-emitting diodes. In the past, the performance of devices has been improved mainly by optimizing the active and charge injection layers. However, the large refractive index difference among different materials limits the overall light extraction. Herein, we fabricate efficient methylammonium lead bromide light-emitting diodes on nanophotonic substrates with an optimal device external quantum efficiency of 17.5% which is around twice of the record for the planar device based on this material system. Furthermore, optical modelling shows that a high light extraction efficiency of 73.6% can be achieved as a result of a two-step light extraction process involving nanodome light couplers and nanowire optical antennas on the nanophotonic substrate. These results suggest that utilization of nanophotonic structures can be an effective approach to achieve high performance perovskite light-emitting diodes.

Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.

Main Content
Current View