Mechanoluminescent (ML) materials, exhibiting light emission upon external mechanical stimulation, offer considerable potentials in sensing, imaging, and anti-counterfeiting technologies. However, the scarcity of efficient blue ML materials and the requirement of pre-irradiation severely restrict their practical applications. In this work, Eu2+-activated Sr5(PO4)3Cl phosphors were synthesized under ambient conditions, and their luminescent properties were investigated when incorporated into a polydimethylsiloxane (PDMS) elastomer matrix. Notably, intense blue ML with strain-dependent intensity, non-pre-irradiation and self-recovery activities was achieved. By analyzing the interfacial triboelectricity, cathodoluminescence, thermoluminescence, and matrix effect, it was demonstrated that the ML of Sr5(PO4)3Cl:Eu2+ in PDMS should come from the electron bombardment processes induced by the interfacial triboelectricity, which was further verified by an ionic liquid incorporation strategy. Based on the unique ML properties of Sr5(PO4)3Cl:Eu2+/PDMS elastomer, advanced anti-counterfeiting devices with mildew-resistant behavior were developed. This research offers a fresh perspective on the development and design of ML materials, and presents attractive approaches for advancing the ML applications.

中文翻译：

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在 Eu2+ 活化的 Sr5（PO4）3Cl 中实现高效的蓝色机械发光，用于具有防霉性能的高级防伪


机械发光 （ML） 材料在外部机械刺激下会发光，在传感、成像和防伪技术方面具有相当大的潜力。然而，高效蓝色 ML 材料的稀缺性和预辐照的要求严重限制了它们的实际应用。在本工作中，在环境条件下合成了 Eu2+ 活化的 Sr5（PO4）3Cl 荧光粉，并研究了它们掺入聚二甲基硅氧烷 （PDMS） 弹性体基质时的发光性能。值得注意的是，实现了具有应变依赖性强度、非预照射和自我恢复活性的强烈蓝色 ML。通过分析界面摩擦电、阴极发光、热释光和基体效应，证明 PDMS 中 Sr5（PO4）3Cl：Eu2+ 的 ML 应来自界面摩擦电诱导的电子轰击过程，离子液体掺入策略进一步验证了这一点。基于 Sr5（PO4）3Cl：Eu2+/PDMS 弹性体独特的 ML 特性，开发了具有防霉行为的先进防伪装置。这项研究为 ML 材料的开发和设计提供了新的视角，并提出了推进 ML 应用的有吸引力的方法。