Force-induced charge carrier storage: a new route for stress recording.
Force-induced charge carrier storage: a new route for stress recording.
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力诱导电荷载流子存储：应力记录的新途径
DOI：
10.1038/s41377-020-00422-4
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Xie RJ
中科院分区：
文献类型：
--
作者：
Zhuang Y;Tu D;Chen C;Wang L;Zhang H;Xue H;Yuan C;Chen G;Pan C;Dai L;Xie RJ
应力传感是人机界面、生物医学工程和机械结构检测系统的基础。基于机械发光（ML）的应力传感具有分布式检测和远程响应的显著优势，有望成为下一代触觉传感器和应力记录仪的关键技术。然而，ML材料中的瞬时光子发射通常需要用光电探测器实时记录，从而将其应用领域限制在实时应力传感上。在本文中，我们报告了在深陷阱ML材料中的力诱导电荷载流子存储（FICS）效应，该效应使得在深陷阱中存储施加的机械能，然后在热刺激下释放所存储的能量作为光子发射。在具有压电结构、有效发射中心和深陷阱分布的5种ML材料中证实了FICS效应，并通过详细的光谱表征研究了其机理。此外，我们还展示了FICS效应在电子签名记录、落点监测和车辆碰撞记录中的三个应用，这些应用表现出分布式记录、长期存储和不需要连续电源的突出优势。本文报道的FICS效应不仅为ML材料在应力记录领域提供了一个突破，而且为开发机械能存储和转换系统提供了一种新的思路。
Stress sensing is the basis of human-machine interface, biomedical engineering, and mechanical structure detection systems. Stress sensing based on mechanoluminescence (ML) shows significant advantages of distributed detection and remote response to mechanical stimuli and is thus expected to be a key technology of next-generation tactile sensors and stress recorders. However, the instantaneous photon emission in ML materials generally requires real-time recording with a photodetector, thus limiting their application fields to real-time stress sensing. In this paper, we report a force-induced charge carrier storage (FICS) effect in deep-trap ML materials, which enables storage of the applied mechanical energy in deep traps and then release of the stored energy as photon emission under thermal stimulation. The FICS effect was confirmed in five ML materials with piezoelectric structures, efficient emission centres and deep trap distributions, and its mechanism was investigated through detailed spectroscopic characterizations. Furthermore, we demonstrated three applications of the FICS effect in electronic signature recording, falling point monitoring and vehicle collision recording, which exhibited outstanding advantages of distributed recording, long-term storage, and no need for a continuous power supply. The FICS effect reported in this paper provides not only a breakthrough for ML materials in the field of stress recording but also a new idea for developing mechanical energy storage and conversion systems.
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