Harnessing Molecular Vibrations to Probe Triplet Dynamics during Singlet Fission

Christopher Grieco, Eric R. Kennehan, Adam Rimshaw, Marcia M. Payne, John E. Anthony, John B. Asbury

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Ultrafast vibrational spectroscopy in the mid-infrared spectral range provides the opportunity to probe the dynamics of electronic states involved in all stages of the singlet fission reaction through their unique vibrational frequencies. This capability is demonstrated using a model singlet fission chromophore, 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS-Pn). The alkyne groups of the TIPS side chains are coupled to the conjugated framework of the pentacene cores, enabling direct examination of the dynamics of triplet excitons that have successfully separated from correlated triplet pair states in crystalline films of TIPS-Pn. Relaxation processes during the separation of triplet excitons and triplet-triplet annihilation after their separation result in the formation of hot ground state molecules that also exhibit unique vibrational frequencies. Because all organic molecules possess native vibrational modes, ultrafast vibrational spectroscopy offers a new approach to examine the dynamics of electronic intermediates that may inform ongoing efforts to utilize singlet fission to overcome thermalization losses in photovoltaic applications.

Original languageEnglish (US)
Pages (from-to)5700-5706
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume8
Issue number23
DOIs
StatePublished - Dec 7 2017

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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