Ogawa Taku, Yanai Nobuhiro, Monguzzi Angelo, Kimizuka Nobuo
Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
1] Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan [2] PRESTO, JST, Honcho 4-1-8, Kawaguchi, Saitama 332-0012, Japan.
Sci Rep. 2015 Jun 9;5:10882. doi: 10.1038/srep10882.
To meet the world's demands on the development of sunlight-powered renewable energy production, triplet-triplet annihilation-based photon upconversion (TTA-UC) has raised great expectations. However, an ideal highly efficient, low-power, and in-air TTA-UC has not been achieved. Here, we report a novel self-assembly approach to achieve this, which enabled highly efficient TTA-UC even in the presence of oxygen. A newly developed lipophilic 9,10-diphenylanthracene-based emitter molecule functionalized with multiple hydrogen-bonding moieties spontaneously coassembled with a triplet sensitizer in organic media, showing efficient triplet sensitization and subsequent triplet energy migration among the preorganized chromophores. This supramolecular light-harvesting system shows a high UC quantum yield of 30% optimized at low excitation power in deaerated conditions. Significantly, the UC emission largely remains even in an air-saturated solution, and this approach is facilely applicable to organogel and solid-film systems.
为满足全球对基于太阳光的可再生能源生产发展的需求，基于三重态-三重态湮灭的光子上转换（TTA-UC）引发了人们的厚望。然而，理想的高效、低功率且能在空气中实现的TTA-UC尚未达成。在此，我们报道了一种实现此目标的新型自组装方法，该方法即使在有氧存在的情况下也能实现高效的TTA-UC。一种新开发的基于9,10-二苯基蒽的亲脂性发射体分子，经多个氢键部分功能化后，在有机介质中与三重态敏化剂自发共组装，在预组织的发色团之间表现出高效的三重态敏化及随后的三重态能量迁移。这种超分子光捕获系统在脱气条件下低激发功率时优化后的上转换量子产率高达30%。值得注意的是，即使在空气饱和溶液中，上转换发射仍大部分保留，且该方法可轻松应用于有机凝胶和固体薄膜体系。
