School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), No.1 D-11, Xueyuan Road, Haidian District, 100083 Beijing, China.
Biomater Sci. 2020 Jun 7;8(11):3072-3077. doi: 10.1039/d0bm00231c. Epub 2020 Apr 9.
Triplet-triplet annihilation upconversion (TTA-UC) has great potential in many fields. However, a stable TTA-UC system with adjustable UC efficiency in non-deoxygenated water is still in urgent demand. Here, the first example of short peptide-tuned UC luminescence in water is reported. With only a small amount of peptides, UC chromophores can assemble into tetrahedral microrods with adjustable size and UC efficiency. Successful TTA-UC luminescence of these microrods in water is achieved due to the regular and dense organization of molecular upconversion chromophores tuned by peptides, which allows rapid triplet exciton migration, avoids aggregation-induced quenching and screens molecular oxygen to upconversion chromophores.
三重态-三重态湮灭上转换（TTA-UC）在许多领域都有很大的潜力。然而，在非缺氧水中具有可调 UC 效率的稳定 TTA-UC 系统仍亟待需求。本文首次报道了在水中由短肽调控的 UC 发光。通过少量的肽，UC 发色团可以组装成具有可调尺寸和 UC 效率的四面体微棒。由于肽调控的分子上转换发色团的规则和密集的排列，这些微棒在水中可以实现成功的 TTA-UC 发光，这使得三重态激子能够快速迁移，避免了聚集诱导猝灭，并将分子氧屏蔽在上转换发色团上。
