| SPECIAL TOPIC — Exciton Physics: Fundamentals, materials and devices |
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Förster energy transfer boosts indirect anisotropic interlayer excitons in 2L-MoSe2/perovskite heterostructures |
| Yingying Chen(陈瑛瑛)1, Zihao Jiao(焦子豪)2, Haizhen Wang(王海珍)2, and Dehui Li(李德慧)2,3,† |
1 School of Science, Jimei University, Xiamen 361021, China;
2 School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China;
3 Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract Interlayer excitons (IXs) in two-dimensional (2D) van der Waals heterostructures have attracted considerable attention due to their unique optical and electronic properties. Owing to the spatially indirect nature, the radiative emission efficiency is highly sensitive to interlayer twist angles. Further considering that their uniformly oriented out-of-plane dipole moments limit directional emission, strategies to simultaneously improve emission efficiency and induce optical anisotropy warrant in-depth investigation. In this work, we report significant photoluminescence (PL) enhancement and optical anisotropy of IXs in 2L-MoSe$_{2}$/perovskite heterostructures mediated by energy transfer from ReS$_{2}$. We attribute this enhancement to Förster resonance energy transfer (FRET), which increases the 2L-MoSe$_{2}$ emission by approximately eight-fold at room temperature, and nearly doubles the emission intensity of momentum-indirect IXs in 2L-MoSe$_{2}$/perovskite heterostructures at 78 K. Importantly, the optical anisotropy of ReS$_{2}$ can be effectively imprinted onto 2L-MoSe$_2$ and associated indirect IXs during the energy transfer process, yielding a linear dichroism of approximately 1.1 for both intralayer excitons and IXs with identical polarization directions. These findings expand the scope of IX study beyond direct bandgap materials with strong intrinsic emission to include systems with indirect bandgaps, offering new avenues for realizing high-performance polarization-sensitive optoelectronic devices.
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Received: 29 December 2025
Revised: 26 February 2026
Accepted manuscript online: 26 March 2026
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PACS:
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71.35.-y
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(Excitons and related phenomena)
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| Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2024YFA1208500), the Hubei Provincial Natural Science Foundation (Grant No. 2025AFA039), Open Project Program of Hubei Optical Fundamental Research Center (Grant No. HBO2026C015), the Natural Science Foundation of Fujian Province, China (Grant No. 2025J08202), and Xiamen City (Grant No. 3502Z202471047). |
Corresponding Authors:
Dehui Li
E-mail: dehuili@hust.edu.cn
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Cite this article:
Yingying Chen(陈瑛瑛), Zihao Jiao(焦子豪), Haizhen Wang(王海珍), and Dehui Li(李德慧) Förster energy transfer boosts indirect anisotropic interlayer excitons in 2L-MoSe2/perovskite heterostructures 2026 Chin. Phys. B 35 057112
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