Femtosecond luminescence dynamics in a nonlinear optical organic dendrimer

O. Varnavski, A. Leanov, L. Liu, James M Takacs

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The ultrafast intrinsic dynamics of an organic dendrimer in solution and in a thin film is reported using fluorescence upconversion spectroscopy. Femtosecond decay is detected at higher emission energies, while at lower energies a fluorescence rise time (∼3 ps) was observed that is dependent on the solvent’s polarity. A strong excitation energy dependence of the decay pattern was also observed. Different synthetic functional groups that comprise the macromolecular dendrimer structure were investigated. The mechanism, which describes the complex dynamics in the dendrimer system, was found to be associated with the excitation of the attached chromophore nitroaminostilbene. These results indicate the absence of excited-state interactions of functional groups within the dendrimer macromolecule. A model, which includes the existence of an intermediate nonradiative state, is proposed to describe the complex ultrafast fluorescence dynamics in the dendrimer system.

Original languageEnglish (US)
Pages (from-to)12732-12738
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Issue number19
DOIs
StatePublished - Jan 1 2000

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Dendrimers
dendrimers
Luminescence
luminescence
fluorescence
Functional groups
Fluorescence
excitation
Excitation energy
Fluorescence spectroscopy
decay
Chromophores
Macromolecules
macromolecules
Excited states
chromophores
energy
polarity
Thin films
thin films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Femtosecond luminescence dynamics in a nonlinear optical organic dendrimer. / Varnavski, O.; Leanov, A.; Liu, L.; Takacs, James M.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 61, No. 19, 01.01.2000, p. 12732-12738.

Research output: Contribution to journalArticle

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