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Title: Electric field modulation of 2D perovskite excitonics
Authors: Zhang, Qiannan
Krisnanda, Tanjung
Giovanni, David
Dini, Kevin
Ye, Senyun
Feng, Minjun
Liew, Timothy Chi Hin
Sum, Tze Chien
Keywords: Science::Physics::Optics and light
Issue Date: 2022
Source: Zhang, Q., Krisnanda, T., Giovanni, D., Dini, K., Ye, S., Feng, M., Liew, T. C. H. & Sum, T. C. (2022). Electric field modulation of 2D perovskite excitonics. Journal of Physical Chemistry Letters, 13(31), 7161-7169.
Project: MOE2019-T2-2-2-066
Journal: Journal of Physical Chemistry Letters
Abstract: Multiquantum-well (MQW) perovskite is one of the forerunners in high-efficiency perovskite LED (PeLEDs) research. Despite the rapid inroads, PeLEDs suffer from the pertinent issue of efficiency decrease with increasing brightness, commonly known as "efficiency roll-off". The underlying mechanisms are presently an open question. Herein, we explicate the E-field effects on the exciton states in the archetypal MQW perovskite (C6H5C2H4NH3)2PbI4, or PEPI, in a device-like architecture using field-assisted transient spectroscopy and theoretical modeling. The applied E-field results in a complex interplay of spectral blueshifts and enhancement/quenching of the different exciton modes. The former originates from the DC Stark shift, while the latter is attributed to the E-field modulation of the transfer rates between bright/dark exciton modes. Importantly, our findings uncover crucial insights into the photophysical processes under E-field modulation contributing to efficiency roll-off in MQW PeLEDs. Electrical modulation of exciton properties presents exciting possibilities for signal processing devices.
ISSN: 1948-7185
DOI: 10.1021/acs.jpclett.2c01792
DOI (Related Dataset): 10.21979/N9/DSOXRO
Schools: School of Physical and Mathematical Sciences 
Organisations: KLA-Tencor (Singapore) Pte. Ltd.
Research Centres: MajuLab
Rights: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry Letters, copyright © 2022 American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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