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.
Bibliographical noteFunding Information:
Q. Zhang thanks Kwong-Hoi Tsui, Jiaqi Chen, Yuefei Cai, and Lian Duan from Department of ECE, HKUST for their technical support and fruitful discussions. Q. Zhang thanks Ms Yan Zhang and Mr Alex H. K. Wong from MCPF, HKUST for their help and discussion during SEM taking. This work was supported by National Natural Science Foundation of China (Project No. 51672231), Shen Zhen Science and Technology Innovation Commission (Project No. JCYJ20170818114107730) and Hong Kong Research Grant Council (General Research Fund Project No. 16237816, 16309018). The authors also acknowledge the support from the State Key Laboratory on Advanced Displays and Optoelectronics and the Center for 1D/2D Quantum Materials at HKUST.
© 2019, The Author(s).
ASJC Scopus subject areas
- Biochemistry, Genetics and Molecular Biology(all)
- Physics and Astronomy(all)