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

doi:10.1021/jp4006845

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 journal › Article › peer-review

16 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 language	English (US)
Pages (from-to)	6270-6278
Number of pages	9
Journal	Journal of Physical Chemistry A
Volume	117
Issue number	29
DOIs	https://doi.org/10.1021/jp4006845
State	Published - Jul 25 2013
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry

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10.1021/jp4006845

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title = "Photophysics of delocalized excitons in carbazole dendrimers",

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.",

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T1 - Photophysics of delocalized excitons in carbazole dendrimers

AU - Hwang, Inchan

AU - Selig, Ulrike

AU - Chen, Simon S.Y.

AU - Shaw, Paul E.

AU - Brixner, Tobias

AU - Burn, Paul L.

AU - Scholes, Gregory D.

PY - 2013/7/25

Y1 - 2013/7/25

N2 - 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.

AB - 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.

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Photophysics of delocalized excitons in carbazole dendrimers

Abstract

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