Pure Formamidinium-Based Perovskite Light-Emitting Diodes with High Efficiency and Low Driving Voltage

Lei Meng; En-Ping Yao; Ziruo Hong; Huajun Chen; Pengyu Sun; Zhanlue Yang; Gang Li; Yang Yang

doi:10.1002/adma.201603826

Pure Formamidinium-Based Perovskite Light-Emitting Diodes with High Efficiency and Low Driving Voltage

Adv Mater. 2017 Jan;29(4). doi: 10.1002/adma.201603826. Epub 2016 Nov 23.

Authors

Lei Meng¹, En-Ping Yao^{1

2}, Ziruo Hong¹, Huajun Chen¹, Pengyu Sun¹, Zhanlue Yang¹, Gang Li^{1

3}, Yang Yang¹

Affiliations

¹ Department of Materials Science and Engineering, University of California, Los Angeles, CA, 90095, USA.
² Advanced Optoelectronic Technology Center, National Cheng Kung University, Tainan, 70101, Taiwan.
³ Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China.

PMID: 27879016
DOI: 10.1002/adma.201603826

Abstract

A formamidinium(FA)-based perovskite showns superior optoelectronic properties including better stability than methylammonium-based counterparts. Pure FA-perovskite-based light-emitting diodes (LEDs) with high efficiency are reported. Interestingly, the LED clearly shows a sub-bandgap emission at 1.7 V (bandgap 2.3 eV). This important discovery provides further insights of the charge transport mechanism in perovskite-based optoelectronic devices.

Keywords: formamidinium; light-emitting diodes; perovskites; sub-bandgap emissions.