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

61 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 Jan 1

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excimers
Excitons
Dimers
Demonstrations
Fluorescence
dimers
excitons
fluorescence
Perylene
Absorption spectroscopy
excitation
absorption spectroscopy
monomers
Monomers
Polarization
life (durability)
decay
polarization
profiles
LDS 751

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

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Spectroscopic demonstration of exciton dynamics and excimer formation in a sterically controlled perylene bisimide dimer aggregate. / Son, Minjung; Park, Kyu Hyung; Shao, Changzhun; Würthner, Frank; Kim, Dongho.

In: Journal of Physical Chemistry Letters, Vol. 5, No. 20, 01.01.2014, p. 3601-3607.

Research output: Contribution to journalArticle

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AU - Kim, Dongho

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