<br>具有力学存储和可视化活动的自充电持久机械发光,Advanced Science

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具有力学存储和可视化活动的自充电持久机械发光
Advanced Science ( IF 14.3 ) Pub Date : 2022-08-17 , DOI: 10.1002/advs.202203249
Yongqing Bai _{1,

2,

3} , Xiuping Guo ₁ , Birong Tian ₁ , Yongmin Liang ₂ , Dengfeng Peng ₄ , Zhaofeng Wang _{1,

3}

Affiliation

为了突破机械刺激下瞬态发射行为的限制，非常需要具有长寿命的持续机械发光（ML）。然而，现有的具有持久ML的材料是完全陷阱控制的，并且需要预辐照，这严重阻碍了实际应用。在这项工作中，通过将 Sr ₃ Al ₂ O ₅ Cl ₂ :Dy ³⁺ (SAOCD) 粉末复合到柔性聚二甲基硅氧烷 (PDMS) 基质中，创建了一种新型的 ML，即自充电持久性 ML。无需任何预辐照，所制备的SAOCD/PDMS弹性体可以直接在力学刺激下表现出强烈且持久的ML，这极大地促进了其在力学照明、显示、成像和可视化中的应用。通过研究基体效应以及热释光、阴极发光和摩擦电特性，界面摩擦起电诱导的电子轰击过程被证明是机械刺激下 SAOCD 中自充电能量的原因。基于独特的自充电过程，SAOCD/PDMS进一步展现了力学存储和可视化读取活动，为机械工程、生物工程和人工智能领域处理力学相关问题带来了新颖的思路和方法。

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Self-Charging Persistent Mechanoluminescence with Mechanics Storage and Visualization Activities

Persistent mechanoluminescence (ML) with long lifetime is highly required to break the limits of the transient emitting behavior under mechanics stimuli. However, the existing materials with persistent ML are completely trap-controlled, and a pre-irradiation is required, which severely hinders the practical applications. In this work, a novel type of ML, self-charging persistent ML, is created by compositing the Sr₃Al₂O₅Cl₂:Dy³⁺ (SAOCD) powders into flexible polydimethylsiloxane (PDMS) matrix. With no need for any pre-irradiation, the as-fabricated SAOCD/PDMS elastomer could exhibit intense and persistent ML under mechanics stimuli directly, which greatly facilitates its applications in mechanics lighting, displaying, imaging, and visualization. By investigating the matrix effects as well as the thermoluminescence, cathodoluminescence, and triboelectricity properties, the interfacial triboelectrification-induced electron bombardment processes are demonstrated to be responsible for the self-charged energy in SAOCD under mechanics stimuli. Based on the unique self-charging processes, the SAOCD/PDMS further exhibits mechanics storage and visualized reading activities, which brings novel ideas and approaches to deal with the mechanics-related problems in the fields of mechanical engineering, bioengineering, and artificial intelligence.

更新日期：2022-08-17

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