Stress-Triggered Mechanoluminescence in ZnO-Based Heterojunction for Flexible and Stretchable Mechano-Optics
Stress-Triggered Mechanoluminescence in ZnO-Based Heterojunction for Flexible and Stretchable Mechano-Optics
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DOI：
10.1002/adfm.202301372
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发表时间：
2023-04-26
影响因子：
19
通讯作者：
Yang, Yanmin
中科院分区：
文献类型：
--
作者：
Li, Leipeng;Cai, Chongyang;Yang, Yanmin
由于即将到来的全球能源危机，对节能材料的研究已经加强。在过去的二十年里，机械诱导发光材料受到了相当大的关注，因为它们可以将废物转化为有用的成分，例如，从应力到光的转换。然而，这种材料具有许多限制其广泛应用的限制。本文介绍了一种通过将ZnO嵌入ZnF 2：Mn 2+基质中来提高其机械发光（ML）的策略。在外加应力的动态激发下，证实了红黄色的ML来自于光学活性Mn ~（2+）中心的T ~ 4（1）（4G）→（6）A（1）（6S）跃迁。此外，具有最强ML的样品含有适量的ZnF 2（ZnF 2：ZnO = 7：3）。通过密度泛函理论计算，阐明了一种可能的ML增强机制，这表明ZnF 2/ZnO：Mn 2+异质结的形成。考虑到ML的独特特性，它在各种机械光学场景中展示了其有前途的应用，包括柔性和可伸缩的光电子器件，先进的自供电显示器，电子皮肤/电子签名和防伪，而无需使用外部光/电激励源。该研究显著增加了ML材料的种类，预计将为智能机械控制设备和节能系统的未来发展奠定基础。
Owing to the forthcoming global energy crisis, the search for energy-saving materials has intensified. Over the past two decades, mechanically induced luminescent materials have received considerable attention as they can convert waste into useful components, for instance, the conversion from stress into light. However, this material features many constraints that limit its widespread application. Herein, a strategy to improve the mechanoluminescence (ML) of ZnO by embedding it in a ZnF2:Mn2+ matrix is introduced. Upon dynamic excitation via an external stress, the reddish-yellow ML is confirmed to originate from the T-4(1) (4G) -> (6)A(1) (6S) transition of the optically active Mn2+ center. Moreover, the sample with the strongest ML contains the appropriate amount of ZnF2 (ZnF2:ZnO = 7:3). By performing density functional theory calculations, a possible ML-enhancement mechanism is elucidated, which indicates the formation of a ZnF2/ZnO:Mn2+ heterojunction. Considering the unique characteristics of ML, its promising applications are demonstrated in various mechano-optics scenarios, including flexible and stretchable optoelectronics, advanced self-powered displays, e-skins/e-signatures, and anti-counterfeiting, without the use of external light/electric-incentive sources. The study significantly increases the variety of ML materials and is expected to strengthen the foundation for the future development of smart mechanically controlled devices and energy-saving systems.