Zhang Meng, Xue Juan, Zhu Yi, Yao Chi, Yang Dayong
Frontier Science Center for Synthetic Biology, Key Laboratory of Systems Bioengineering (MOE), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, People's Republic of China.
ACS Appl Mater Interfaces. 2020 May 13;12(19):22191-22199. doi: 10.1021/acsami.0c04253. Epub 2020 Apr 30.
Aerogels hold great promise as a lightweight replacement in materials fields. Dynamic fluorochromic aerogels that possess reversible stimuli responsiveness have been particularly attractive recently for new design opportunities in practical solid-state lighting and wide applications in advanced sensors/probe. In this study, we report a reversibly multiresponsive white-light-emitting (WLE) aerogel prepared with codoped lanthanide, thymidine, and carbon dots. By precisely modulating the stoichiometric ratio of lanthanide complexes and carbon dots, broad-spectrum output from purple to red is obtained, including pure white light (CIE (0.33, 0.32)). The freeze-drying process contributes to the elimination of hydration between water molecules and lanthanide ions, further preventing the quenching of lanthanide luminescence and preserving the high quantum yield (47.4%) of our aerogel. Moreover, the dynamic coordination bond between lanthanide (europium and terbium) and thymidine endows the aerogel with reversible responsiveness upon five different stimuli, including halide anions, metal ions, pH, temperature, and humidity. We envision that our WLE aerogel has considerable potential for use in various fields such as display devices, advanced sensors, and environmentally friendly probes where multiresponsiveness is required.
气凝胶在材料领域作为一种轻质替代品具有巨大潜力。具有可逆刺激响应性的动态荧光变色气凝胶最近在实际固态照明的新设计机会以及先进传感器/探针的广泛应用中特别引人注目。在本研究中，我们报告了一种用共掺杂镧系元素、胸腺嘧啶核苷和碳点制备的可逆多响应白光发射（WLE）气凝胶。通过精确调节镧系元素配合物和碳点的化学计量比，可获得从紫色到红色的广谱输出，包括纯白光（CIE（0.33, 0.32））。冷冻干燥过程有助于消除水分子与镧系离子之间的水合作用，进一步防止镧系元素发光猝灭，并保持我们气凝胶的高量子产率（47.4%）。此外，镧系元素（铕和铽）与胸腺嘧啶核苷之间的动态配位键赋予气凝胶对包括卤化物阴离子、金属离子、pH值、温度和湿度在内的五种不同刺激的可逆响应性。我们设想，我们的WLE气凝胶在需要多响应性的各种领域，如显示设备、先进传感器和环保探针等方面具有相当大的应用潜力。
