Near-Unity Singlet Fission on a Quantum Dot Initiated by Resonant Energy Transfer

Jie Zhang, Hayato Sakai, Katsuaki Suzuki, Taku Hasobe, Nikolai V. Tkachenko, I. Ya Chang, Kim Hyeon-Deuk, Hironori Kaji, Toshiharu Teranishi, Masanori Sakamoto

Research output: Contribution to journalArticlepeer-review

Abstract

The conversion of a high-energy photon into two excitons using singlet fission (SF) has stimulated a variety of studies in fields from fundamental physics to device applications. However, efficient SF has only been achieved in limited systems, such as solid crystals and covalent dimers. Here, we established a novel system by assembling 4-(6,13-bis(2-(triisopropylsilyl)ethynyl)pentacen-2-yl)benzoic acid (Pc) chromophores on nanosized CdTe quantum dots (QDs). A near-unity SF (198 ± 5.7%) initiated by interfacial resonant energy transfer from CdTe to surface Pc was obtained. The unique arrangement of Pc determined by the surface atomic configuration of QDs is the key factor realizing unity SF. The triplet-triplet annihilation was remarkably suppressed due to the rapid dissociation of triplet pairs, leading to long-lived free triplets. In addition, the low light-harvesting ability of Pc in the visible region was promoted by the efficient energy transfer (99 ± 5.8%) from the QDs to Pc. The synergistically enhanced light-harvesting ability, high triplet yield, and long-lived triplet lifetime of the SF system on nanointerfaces could pave the way for an unmatched advantage of SF.

Original languageEnglish
Pages (from-to)17388-17394
Number of pages7
JournalJournal of the American Chemical Society
Volume143
Issue number42
DOIs
Publication statusPublished - 2021 Oct 27

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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