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<p>Near-infrared (NIR) mechanoluminescent (ML) materials hold significant potential for nondestructive detection and biological stress imaging applications. However, practical implementation may be hindered by a narrow NIR ML bandwidth, dependence on ultraviolet preirradiation, and a high stress threshold. In this study, we develop a low-threshold broadband NIR ML material with self-recoverable characteristics by introducing Cr<sup>3+</sup> into a simple and naturally abundant oxide host, MgO. The observed ML originates from the localized piezoelectricity effect induced by Cr<sup>3+</sup> incorporation. The optimized MgO:0.008Cr<sup>3+</sup> exhibits a predominant ML peak at 809 nm with a broad full width at half maximum of 209 nm. Notably, this material demonstrates high ML intensity and sensitivity, enabling detectable emission even under extremely low-stress conditions (1 N). Leveraging its bright and broadband NIR ML, MgO:Cr<sup>3+</sup> is applied for nondestructive assessment of wine quality. Furthermore, a simulated biological stress imaging model was used to verify its superior tissue penetration ability. This study expands the library of self-recoverable NIR ML materials with broadband emission and offers valuable insights for advancing the practical utilization of NIR ML technologies.</p>

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Self-recoverable broadband near-infrared mechanoluminescence in Cr3+-doped MgO

  • 期刊论文

  • 发表日期：

    2025年10月10日

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  • Fangyi Zhao,
  • Yuhe Shao,
  • Qinan Mao,
  • Heyi Yang,
  • Quanlin Liu,
  • Jiasong Zhong

摘要

Near-infrared (NIR) mechanoluminescent (ML) materials hold significant potential for nondestructive detection and biological stress imaging applications. However, practical implementation may be hindered by a narrow NIR ML bandwidth, dependence on ultraviolet preirradiation, and a high stress threshold. In this study, we develop a low-threshold broadband NIR ML material with self-recoverable characteristics by introducing Cr3+ into a simple and naturally abundant oxide host, MgO. The observed ML originates from the localized piezoelectricity effect induced by Cr3+ incorporation. The optimized MgO:0.008Cr3+ exhibits a predominant ML peak at 809 nm with a broad full width at half maximum of 209 nm. Notably, this material demonstrates high ML intensity and sensitivity, enabling detectable emission even under extremely low-stress conditions (1 N). Leveraging its bright and broadband NIR ML, MgO:Cr3+ is applied for nondestructive assessment of wine quality. Furthermore, a simulated biological stress imaging model was used to verify its superior tissue penetration ability. This study expands the library of self-recoverable NIR ML materials with broadband emission and offers valuable insights for advancing the practical utilization of NIR ML technologies.