Highly Efficient Photon Upconversion in Self-Assembled Light-Harvesting Molecular Systems

Taku Ogawa, Nobuhiro Yanai, Angelo Monguzzi, Nobuo Kimizuka

Research output: Contribution to journalArticlepeer-review

97 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number10882
JournalScientific reports
Volume5
DOIs
Publication statusPublished - Jun 9 2015

All Science Journal Classification (ASJC) codes

  • General

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