High yield ultrafast intramolecular singlet exciton fission in a quinoidal bithiophene

Oleg Varnavski, Neranga Abeyasinghe, Juan Aragó, Juan J. Serrano-Pérez, Enrique Ortí, Juan T. López Navarrete, Kazuo Takimiya, David Casanova, Juan Casado, Theodore Goodson

研究成果: Article査読

95 被引用数 (Scopus)


We report the process of singlet exciton fission with high-yield upon photoexcitation of a quinoidal thiophene molecule. Efficient ultrafast triplet photogeneration and its yield are determined by photoinduced triplet-triplet absorption, flash photolysis triplet lifetime measurements, as well as by femtosecond time-resolved transient absorption and fluorescence methods. These experiments show that optically excited quinoidal bithiophene molecule undergoes ultrafast formation of the triplet-like state with the lifetime ∼57 μs. CASPT2 and RAS-SF calculations have been performed to support the experimental findings. To date, high singlet fission rates have been reported for crystalline and polycrystalline materials, whereas for covalently linked dimers and small oligomers it was found to be relatively small. In this contribution, we show an unprecedented quantum yield of intramolecular singlet exciton fission of ∼180% for a quinoidal bithiophene system.

ジャーナルJournal of Physical Chemistry Letters
出版ステータスPublished - 2015 4月 16

ASJC Scopus subject areas

  • 材料科学(全般)
  • 物理化学および理論化学


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