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, Lien Der-Hsien, Matin Amani, Hyungjin Kim, Xiaoqing Chen, Zhangting Wu, Zhenhua Ni, Peng Wang, Yi Shi, Haibo Ma (), Xiang Zhang, Jian-Bin Xu, Alessandro Troisi, Ali Javey () and Xinran Wang ()
Additional contact information
Huijuan Zhao: Nanjing University
Yingbo Zhao: University of California at Berkeley, Materials Sciences Division, Lawrence Berkeley National Laboratory
Yinxuan Song: Nanjing University
Ming Zhou: University of Wisconsin, Madison
Wei Lv: Nanjing University
Liu Tao: Nanjing University
Yuzhang Feng: Nanjing University
Biying Song: Nanjing University
Yue Ma: Nanjing University
Junqing Zhang: Nanjing University
Jun Xiao: University of California
Ying Wang: University of California
Lien Der-Hsien: University of California at Berkeley, Materials Sciences Division, Lawrence Berkeley National Laboratory
Matin Amani: University of California at Berkeley, Materials Sciences Division, Lawrence Berkeley National Laboratory
Hyungjin Kim: University of California at Berkeley, Materials Sciences Division, Lawrence Berkeley National Laboratory
Xiaoqing Chen: Nanjing University
Zhangting Wu: Southeast University
Zhenhua Ni: Southeast University
Peng Wang: Nanjing University
Yi Shi: Nanjing University
Haibo Ma: Nanjing University
Xiang Zhang: University of California
Jian-Bin Xu: The Chinese University of Hong Kong
Alessandro Troisi: University of Liverpool
Ali Javey: University of California at Berkeley, Materials Sciences Division, Lawrence Berkeley National Laboratory
Xinran Wang: Nanjing University

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-13581-9

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