超分子组装体系中基于三重态-三重态湮灭的上转换发光

Triplet-Triplet Annihilation-Based Upconversion in Supramolecular System

超分子组装实质上是对分子的精密组织和调控,结合三重态-三重态湮灭上转换发光,能够调控分子激发态能量的转移,提高上转换效率。本文综述了超分子组装体系中上转换发光的研究进展,包括基于有机凝胶、亲疏溶剂组装的超分子膜、纳米颗粒、聚合物薄膜以及主-客体配位超分子等体系。这些超分子体系为上转换发光提供了良好的基质,取代了传统三重态-三重态湮灭上转换发光的溶液体系,既解决了由于染料溶解性导致的聚集荧光猝灭,又有效地阻隔了氧气,同时,将上转换发光体系固体化而便于集成到器件等各个应用领域。值得注意的是,不同的超分子组装体系中的上转换发光,有着温度响应,可逆开/关效应,甚至是将光能转化为机械能的特性。

Self-assembly is an essential process that can precisely organize molecules into supramolecular systems by artificial control. Introducing this concept into triplet-triplet annihilation-based upconversion（ TTA-UC）system,triplet-triplet energy transfer and triplet-triplet annihilation can be regulated easily,thus the upconversion emission efficiency might be significantly improved. This review concentrates on the research progress about supramolecular system-based TTA-UC,including organogel,membrane,nanoparticles,polymer films,hostguest complexes,etc. Instead of conventional solution system,supramolecular systems provide ideal matrixes,which not only avoid the fluorescence quenching caused by aggregation and phase-segregation of dye molecules,but also prevent the triplet oxygen caused quenching. Meanwhile,supramolecular systems are facile enough to integrate TTA-UC system into devices. Furthermore,integrating TTA-UC and different supramolecular systems,variety properties can be achieved,such as temperature responsibility,all-or-none switching,and so on. In brief,supramolecular systems make TTA-UC system more potential to be applied in many fields,such as photonic devices,solar cell,nano-medical,bio-imagining and so forth.