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.

中文翻译：

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肽组装在非脱氧水中辅助三重态-三重态an灭光子上转换。

三重态-三重态an灭上转换（TTA-UC）在许多领域都具有巨大潜力。但是，仍然迫切需要一种稳定的TTA-UC系统，该系统在非脱氧水中的UC效率可调节。在此，报道了水中短肽调谐的UC发光的第一个例子。仅需少量肽，UC发色团就可以组装成具有可调节大小和UC效率的四面体微棒。这些微棒在水中的成功TTA-UC发光是由于通过肽调节的分子上转换生色团的规则且致密的组织实现的，该结构使得三重态激子迁移迅速，避免了聚集诱导的猝灭，并筛选了分子氧向上转换生色团的作用。