Deng Yuchen, Li Peng, Li Jiatong, Sun Daolai, Li Huanrong
National-Local Joint Engineering Laboratory for Energy Conservation in Chemical Process Integration and Resources Utilization, Tianjin Key Laboratory of Chemical Process Safety, School of Chemical Engineering and Technology, Hebei University of Technology, Guangrong Dao 8, Hongqiao District, Tianjin 300130, P. R. China.
Institute for Smart Materials & Engineering, University of Jinan, No. 336 Nanxinzhuang West Road, Jinan 250022, P. R. China.
ACS Appl Mater Interfaces. 2021 Mar 31;13(12):14407-14416. doi: 10.1021/acsami.1c01174. Epub 2021 Mar 22.
Developing room-temperature phosphorescence (RTP) materials with color-tunability performance in an aqueous environment is crucial for application in optoelectronic areas to a higher stage, such as multicolor display, visual detection of external stimulus, and high-level information anticounterfeiting, but still faces a formidable challenge. Herein, we propose an efficient design strategy to develop excitation wavelength-responsive RTP supramolecular co-assembly systems of a simple benzoic acid derivative and Laponite () clay nanoplates in aqueous solution, displaying an ultralong lifetime (0.632 s) and a high phosphorescence quantum efficiency (18.04%) simultaneously. Experimental and theoretical research studies suggest that this distinctive feature is due to the generation of more and efficient intersystem crossing pathways benefiting from the coexistence of isolated and J-aggregation states via controlling the doping of the benzoic acid derivative and the inhibition of phosphorescence quenching by water because of the synergistic effects of robust hydrogen-bonding interactions between and the benzoic acid derivative, J-aggregations of the benzoic acid derivative, and good oxygen tolerance of the clay. By virtue of their excellent RTP performances in aqueous solution, the visual colorimetric detection of Ag in a water environment was achieved for the first time, and visible and high-level information encryption was accomplished as well.
在水性环境中开发具有颜色可调性能的室温磷光（RTP）材料对于将光电领域的应用提升到更高阶段至关重要，例如多色显示、外部刺激的视觉检测和高级信息防伪，但仍然面临巨大挑战。在此，我们提出了一种有效的设计策略，以在水溶液中开发一种简单苯甲酸衍生物与锂皂石（Laponite）粘土纳米片的激发波长响应型RTP超分子共组装体系，该体系同时展现出超长寿命（0.632 s）和高磷光量子效率（18.04%）。实验和理论研究表明，这一独特特性归因于通过控制苯甲酸衍生物的掺杂以及由于锂皂石与苯甲酸衍生物之间强大的氢键相互作用、苯甲酸衍生物的J-聚集以及锂皂石粘土良好的氧耐受性的协同效应抑制水对磷光的猝灭，从而产生了更多且有效的系间窜越途径，得益于孤立态和J-聚集态的共存。凭借其在水溶液中的优异RTP性能，首次实现了在水环境中对银的视觉比色检测，同时也完成了可见光和高级信息加密。
