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Strong optical response and light emission from a monolayer molecular crystal

Author

Listed:
  • 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)

  • Der-Hsien Lien

    (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
    Xidian 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)

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.

Suggested Citation

  • 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 & Xi, 2019. "Strong optical response and light emission from a monolayer molecular crystal," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-13581-9
    DOI: 10.1038/s41467-019-13581-9
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    Cited by:

    1. Dogyeong Kim & Sol Lee & Jiwon Park & Jinho Lee & Hee Cheul Choi & Kwanpyo Kim & Sunmin Ryu, 2023. "In-plane and out-of-plane excitonic coupling in 2D molecular crystals," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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