Tong Shuang, Dai Jianhong, Sun Jiangman, Liu Yuanyuan, Ma Xiaoli, Liu Zhehong, Ma Teng, Tan Jiao, Yao Zhen, Wang Shanmin, Zheng Haiyan, Wang Kai, Hong Fang, Yu Xiaohui, Gao Chunxiao, Gu Xinggui
State Key Laboratory of Superhard Materials, Jilin University, Changchun, 130012, China.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.
Nat Commun. 2022 Sep 6;13(1):5234. doi: 10.1038/s41467-022-32968-9.
The development of organic solid-state luminescent materials, especially those sensitive to aggregation microenvironment, is critical for their applications in devices such as pressure-sensitive elements, sensors, and photoelectric devices. However, it still faces certain challenges and a deep understanding of the corresponding internal mechanisms is required. Here, we put forward an unconventional strategy to explore the pressure-induced evolution of the aggregation microenvironment, involving changes in molecular conformation, stacking mode, and intermolecular interaction, by monitoring the emission under multiple excitation channels based on a luminogen with aggregation-induced emission characteristics of di(p-methoxylphenyl)dibenzofulvene. Under three excitation wavelengths, the distinct emission behaviors have been interestingly observed to reveal the pressure-induced structural evolution, well consistent with the results from ultraviolet-visible absorption, high-pressure angle-dispersive X-ray diffraction, and infrared studies, which have rarely been reported before. This finding provides important insights into the design of organic solid luminescent materials and greatly promotes the development of stimulus-responsive luminescent materials.
有机固态发光材料的发展，尤其是那些对聚集微环境敏感的材料，对于其在压敏元件、传感器和光电器件等器件中的应用至关重要。然而，它仍然面临一定挑战，需要深入理解相应的内部机制。在此，我们提出一种非常规策略，通过基于具有聚集诱导发光特性的二（对甲氧基苯基）二苯并富烯发光体，在多个激发通道下监测发射，来探索压力诱导的聚集微环境演变，包括分子构象、堆积模式和分子间相互作用的变化。在三个激发波长下，有趣地观察到了不同的发射行为以揭示压力诱导的结构演变，这与紫外可见吸收、高压角散射X射线衍射和红外研究结果高度一致，而这些结果此前鲜有报道。这一发现为有机固体发光材料的设计提供了重要见解，并极大地推动了刺激响应型发光材料的发展。
