Zhao, Huijuan, Zhao, Yingbo, Song, Yinxuan, Zhou, Ming, Lv, Wei, Tao, Liu, Feng, Yuzhang, Song, Biying, Ma, Yue, Zhang, Junqing et al (show 16 more authors)
(2019)
Strong optical response and light emission from a monolayer molecular crystal.
NATURE COMMUNICATIONS, 10 (1).
5589-.
Text
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Abstract
Excitons in two-dimensional (2D) materials are tightly bound and exhibit rich physics. So far, the optical excitations in 2D semiconductors are dominated by Wannier-Mott excitons, but molecular systems can host Frenkel excitons (FE) with unique properties. Here, we report a strong optical response in a class of monolayer molecular J-aggregates. The exciton exhibits giant oscillator strength and absorption (over 30% for monolayer) at resonance, as well as photoluminescence quantum yield in the range of 60-100%. We observe evidence of superradiance (including increased oscillator strength, bathochromic shift, reduced linewidth and lifetime) at room-temperature and more progressively towards low temperature. These unique properties only exist in monolayer owing to the large unscreened dipole interactions and suppression of charge-transfer processes. Finally, we demonstrate light-emitting devices with the monolayer J-aggregate. The intrinsic device speed could be beyond 30 GHz, which is promising for next-generation ultrafast on-chip optical communications.
Item Type: | Article |
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Depositing User: | Symplectic Admin |
Date Deposited: | 18 Feb 2020 11:51 |
Last Modified: | 19 Jan 2023 00:02 |
DOI: | 10.1038/s41467-019-13581-9 |
Related URLs: | |
URI: | https://livrepository.liverpool.ac.uk/id/eprint/3075402 |