Tuneable Singlet Exciton Fission and Triplet&-Triplet Annihilation in an Orthogonal Pentacene Dimer Articles uri icon


  • Lukman, Steven
  • J. Musser, Andrew
  • Chen, Kai
  • K. Yong, Chaw
  • Zeng, Zebing
  • Ye, Qun
  • Chi, Chunyan
  • M. Hodgkiss, Justin
  • Wu, Jishan
  • H. Friend, Richard
  • C. Greenham, Neil

publication date

  • August 2015

start page

  • 5452

end page

  • 5461


  • 34


  • 25

International Standard Serial Number (ISSN)

  • 1616-301X

Electronic International Standard Serial Number (EISSN)

  • 1616-3028


  • Fast and highly efficient intramolecular singlet exciton fission in a pentacene dimer, consisting of two covalently attached, nearly orthogonal pentacene units is reported. Fission to triplet excitons from this ground state geometry occurs within 1 ps in isolated molecules in solution and dispersed solid matrices. The process exhibits a sensitivity to environmental polarity and competes with geometric relaxation in the singlet state, while subsequent triplet decay is strongly dependent on conformational freedom. The near orthogonal arrangement of the pentacene units is unlike any structure currently proposed for efficient singlet exciton fission and may lead to new molecular design rules.


  • Physics