Strong optical response and light emission from a monolayer molecular crystal

Huijuan Zhao, Yingbo Zhao, Yinxuan Song, Ming Zhou, Wei Lv, Liu Tao, Yuzhang Feng, Biying Song, Yue Ma, Junqing Zhang, Jun Xiao, Ying Wang, Der Hsien Lien, Matin Amani, Hyungjin Kim, Xiaoqing Chen, Zhangting Wu, Zhenhua Ni, Peng Wang, Yi ShiHaibo Ma, Xiang Zhang, Jian Bin Xu, Alessandro Troisi, Ali Javey, Xinran Wang*

*此作品的通信作者

研究成果: Article同行評審

62 引文 斯高帕斯(Scopus)

摘要

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.

原文English
文章編號5589
期刊Nature Communications
10
發行號1
DOIs
出版狀態Published - 1 12月 2019

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