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Self-powered near-infrared mechanoluminescence through MgO/MgF2 piezo-photonic heterojunctions

Author

Listed:
  • Sheng Wu

    (South China Normal University)

  • Shunyu Wang

    (South China Normal University)

  • Zhigang Shao

    (South China Normal University)

  • Yinzhen Wang

    (South China Normal University)

  • Puxian Xiong

    (The University of Hong Kong)

Abstract

Near-infrared mechanoluminescent (NIR ML) materials attract considerable attention for their force-to-light conversion capabilities. However, current materials generally have disadvantages such as high threshold and poor self-recovery ability, which limit their practical applications. Herein, we present a self-powered NIR ML material MgF2:Cr3+, which does not require pre-charging process. Leveraging the structural similarity between MgF2 and MgO, we design a MgO/MgF2:Cr3+ heterojunction piezo-photonic system that exhibits high intensity, low activation threshold, and excellent self-powered ML performance. By tuning the molar ratio of MgO to MgF2, the optimized ML intensity enhances by ≈18 times. Kelvin probe force microscopy surface potential measurement reveals a significant built-in electric field at MgF2:Cr3+ heterojunction interface. Based on the first-principle calculation results, the excellent ML performance originates from the offset of the valence band and the conduction band in the MgO/MgF2:Cr3+ heterostructure and the narrowing of the band gap, which significantly improve the electron (4.09 × 102 cm2 V-1 s-1) and hole (4.62 × 102 cm2 V-1 s-1) mobility, thereby boosting charge transfer and recombination processes. This study provides a strategy for designing high-performance self-powered NIR ML materials based on interfacial effects, offering insights into their expanded applications in the potential bio stress related biological field.

Suggested Citation

  • Sheng Wu & Shunyu Wang & Zhigang Shao & Yinzhen Wang & Puxian Xiong, 2025. "Self-powered near-infrared mechanoluminescence through MgO/MgF2 piezo-photonic heterojunctions," Nature Communications, Nature, vol. 16(1), pages 1-16, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-63980-4
    DOI: 10.1038/s41467-025-63980-4
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    1. Hao Wang & Tingting Zhao & Mei Li & Junlong Li & Ke Liu & Shang Peng & Xuqiang Liu & Bohao Zhao & Yanlong Chen & Jiao An & Xiaohui Chen & Sheng Jiang & Chuanlong Lin & Wenge Yang, 2025. "Oscillatory mechanoluminescence of Mn2+-doped SrZnOS in dynamic response to rapid compression," Nature Communications, Nature, vol. 16(1), pages 1-10, December.
    2. Chaojie Chen & Shilong Zhao & Caofeng Pan & Yunlong Zi & Fangcheng Wang & Cheng Yang & Zhong Lin Wang, 2022. "A method for quantitatively separating the piezoelectric component from the as-received “Piezoelectric” signal," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    3. Chenghai Li & Qiguang He & Yang Wang & Zhijian Wang & Zijun Wang & Raja Annapooranan & Michael I. Latz & Shengqiang Cai, 2022. "Highly robust and soft biohybrid mechanoluminescence for optical signaling and illumination," Nature Communications, Nature, vol. 13(1), pages 1-13, December.
    4. Zongliang Xie & Yufeng Xue & Xianhe Zhang & Junru Chen & Zesen Lin & Bin Liu, 2024. "Isostructural doping for organic persistent mechanoluminescence," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
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