Photophysics of delocalized excitons in carbazole dendrimers

Inchan Hwang, Ulrike Selig, Simon S.Y. Chen, Paul E. Shaw, Tobias Brixner, Paul L. Burn, Gregory D. Scholes

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

The photophysical properties in solution of three generations of carbazole-based dendrons and dendrimers with fluorenyl surface groups were studied using steady-state, time-resolved femtosecond transient absorption and anisotropy, and coherent two-dimensional ultraviolet spectroscopy. It was found that increasing the generation caused a switch in the nature of the emissive state between the first-generation compounds and the second- and third-generation dendrimers. Time-resolved anisotropy measurements revealed low initial anisotropies that decreased with increasing dendrimer generation consistent with increasing intradendrimer interchromophore coupling. Two-dimensional UV spectroscopy showed that the signal from the second- and third-generation dendrimers is the product of multiple chromophores interacting. The maximum number of interacting chromophores is reached by the second generation.

Original languageEnglish (US)
Pages (from-to)6270-6278
Number of pages9
JournalJournal of Physical Chemistry A
Volume117
Issue number29
DOIs
StatePublished - Jul 25 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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    Hwang, I., Selig, U., Chen, S. S. Y., Shaw, P. E., Brixner, T., Burn, P. L., & Scholes, G. D. (2013). Photophysics of delocalized excitons in carbazole dendrimers. Journal of Physical Chemistry A, 117(29), 6270-6278. https://doi.org/10.1021/jp4006845