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

Qianpeng Zhang, Mohammad Mahdi Tavakoli, Leilei Gu, Daquan Zhang, Lei Tang, Yuan Gao, Ji Guo, Yuanjing Lin, Siu-Fung Leung, Swapnadeep Poddar, Yu Fu and Zhiyong Fan ()
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Qianpeng Zhang: Clear Water Bay
Mohammad Mahdi Tavakoli: Clear Water Bay
Leilei Gu: Clear Water Bay
Daquan Zhang: Clear Water Bay
Lei Tang: Clear Water Bay
Yuan Gao: Clear Water Bay
Ji Guo: Clear Water Bay
Yuanjing Lin: Clear Water Bay
Siu-Fung Leung: Clear Water Bay
Swapnadeep Poddar: Clear Water Bay
Yu Fu: Clear Water Bay
Zhiyong Fan: Clear Water Bay

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-08561-y

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