Xie Zongliang, Deng Huangjun, Ge Xiangyu, Chi Zhenguo, Liu Bin
Institute for Functional Intelligent Materials, National University of Singapore, Singapore 117544, Singapore.
School of Environmental and Chemical Engineering, Wuyi University, Jiangmen 529020, China.
J Am Chem Soc. 2025 Apr 16;147(15):12722-12729. doi: 10.1021/jacs.5c00894. Epub 2025 Mar 2.
The ability of mechanoluminescent (ML) materials to convert mechanical energy into visualizable patterns through light emission offers a wide range of applications in advanced stress sensing, human-machine interfaces, biomedical science, etc. However, the development remains in its infancy, and more importantly, the reliance on specific crystalline structures in most existing ML materials limits their processability and practical utility. Here, we introduce a series of purely organic amorphous ML materials incorporating flexible skeletons and twisted donor-acceptor-acceptor' structures designed to enhance dipole moment and flexibility. These materials exhibit multicolor ML in amorphous states and possess low glass transition temperatures, allowing facile and in situ regeneration and processing. The stress-induced short-range molecular ordering within the amorphous phase generates local piezoelectricity, enabling ML without crystallinity. This approach overcomes the limitations of traditional crystalline ML materials, facilitating the development of flexible ML films and expanding the practical utility of organic ML systems.
机械发光（ML）材料能够通过发光将机械能转化为可视化图案，在先进应力传感、人机界面、生物医学科学等领域有着广泛应用。然而，该领域的发展仍处于起步阶段，更重要的是，大多数现有ML材料对特定晶体结构的依赖限制了它们的可加工性和实际应用价值。在此，我们介绍了一系列纯有机非晶态ML材料，它们具有柔性骨架和扭曲的给体-受体-受体结构，旨在增强偶极矩和柔韧性。这些材料在非晶态下呈现多色ML，且玻璃化转变温度较低，便于原位再生和加工。非晶相内应力诱导的短程分子有序排列产生局部压电性，从而实现无结晶性的ML。这种方法克服了传统晶体ML材料的局限性，推动了柔性ML薄膜的发展，并拓展了有机ML系统的实际应用价值。
