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Strong Exciton–Exciton Scattering of Exfoliated van der Waals InSe toward Efficient Continuous-Wave Near-Infrared P-Band Emission

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Download Hi-Res ImageDownload to MS-PowerPointCite This:Nano Lett. 2023, 23, 9, 4058-4065
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    Strong Exciton–Exciton Scattering of Exfoliated van der Waals InSe toward Efficient Continuous-Wave Near-Infrared P-Band Emission
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    • Yin Liang
      Yin Liang
      School of Materials Science and Engineering, Peking University, Beijing 100871, China
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    • Liyun Zhao
      Liyun Zhao
      School of Materials Science and Engineering, Peking University, Beijing 100871, China
      More by Liyun Zhao
      Orcidhttps://orcid.org/0000-0001-8423-7766
    • Chun Li
      Chun Li
      School of Materials Science and Engineering, Peking University, Beijing 100871, China
      More by Chun Li
    • Jiaxing Du
      Jiaxing Du
      School of Materials Science and Engineering, Peking University, Beijing 100871, China
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    • Qiuyu Shang
      Qiuyu Shang
      School of Materials Science and Engineering, Peking University, Beijing 100871, China
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    • Zhongming Wei
      Zhongming Wei
      State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
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      Orcidhttps://orcid.org/0000-0002-6237-0993
    • Qing Zhang*
      Qing Zhang
      School of Materials Science and Engineering, Peking University, Beijing 100871, China
      *Email: [email protected]
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      Orcidhttps://orcid.org/0000-0002-6869-0381
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    Nano Letters

    Cite this: Nano Lett. 2023, 23, 9, 4058–4065
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    https://doi.org/10.1021/acs.nanolett.3c00932
    Published April 21, 2023
    Copyright © 2023 American Chemical Society
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    Abstract

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    P-band emission is a superlinear low-coherence emission through exciton–exciton (X–X) scattering into photon-like states. It occurs without the prerequisites of population inversion or macroscopical coherence, rendering lower power consumption than the widely explored superlinear low-coherence emissions including superfluorescence, amplified spontaneous emission, and random lasing, and holds great potential for speckle-free imaging and interferometric sensing. However, competition processes including exciton dissociation and annihilation undermine its operation at room temperature and/or low excitation conditions. Here we report room-temperature P-band emission from InSe microflakes with excitation density of 1010 cm–2, offering 2-orders-of-magnitude lower operation density compared to the state-of-the-art superlinear low-coherence emissions. The efficient P-band emission is attributed to a large X–X scattering strength of 0.25 μeV μm2 due to enhanced spatial confinement along with intrinsic material metrics of 3D/2D exciton complex and asymmetric electron/hole mass. These findings open an avenue toward strong low-coherence near-infrared light sources based on van der Waals semiconductors.

    Copyright © 2023 American Chemical Society

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acs.nanolett.3c00932.

    • Raman spectra and lasing image; P-band emission engineered by edges and bulk defects; power- and temperature-dependent P-band emission; exciton line width broadening; comparison of light sources with different mechanisms; summary of operation threshold of superlinear low-coherence emissions; summary of X–X scattering strength and rate; anisotropic model for excitons in InSe; estimation of excitation density and the exciton density considering thermal quenching; temperature dependence of PL intensity, P-band, and X-peak energy; exciton dephasing by X–X scattering; scattering strength calculation; interexciton separation calculation; effective exciton mass calculation; scattering rate calculation (PDF)

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    This article is cited by 11 publications.

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    Nano Letters

    Cite this: Nano Lett. 2023, 23, 9, 4058–4065
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.nanolett.3c00932
    Published April 21, 2023
    Copyright © 2023 American Chemical Society
    Request reuse permissions

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