Spectroscopic demonstration of exciton dynamics and excimer formation in a sterically controlled perylene bisimide dimer aggregate

Minjung Son, Kyu Hyung Park, Changzhun Shao, Frank Würthner, Dongho Kim

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

Although it is commonly known that H-type PBI aggregates give rise to a broad, red-shifted excimer fluorescence with considerably longer fluorescence lifetimes than observed for the monomers, the underlying mechanisms of excimer formation and other relevant exciton dynamics in such π-stacked systems are still far from being understood. In this context, we demonstrate a thorough spectroscopic investigation on the exciton relaxation pathways, including excimer formation, in a perylene-3,4:9,10-bis(dicarboximide) (PBI) dimer aggregate 1 by using time-resolved fluorescence and transient absorption spectroscopy combined with excitation-power and polarization dependence. It was found that the excited dimer formation process followed by structural rearrangement is approximately two times faster than observed within larger PBI aggregates. Excitation-power-dependent transient absorption decay profiles revealed the fully delocalized nature of excitons in the dimer as opposed to larger stacks.

Original languageEnglish
Pages (from-to)3601-3607
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume5
Issue number20
DOIs
Publication statusPublished - 2014 Oct 16

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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