Fluorescence lifetime analysis of graphene quantum dots

Magnus Röding*, Siobhan J. Bradley, Magnus Nydén, Thomas Nann

*Corresponding author for this work

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Fitting of the fluorescence lifetimes for fluorophores can be achieved using various techniques. Problems arise when the fluorophore sample itself is heterogeneous and the fluorescence decay is far from exponential, as a single sample may have a distribution of lifetimes. We study the fitting of fluorescence lifetimes for two systems, a homogeneous and near-exponential fluorescein dye and a highly heterogeneous system of graphene quantum dots. We fit a variety of different models to experimental time-correlated single photon counting fluorescence data from each system, evaluating the validity of each model for the two systems. We find that, for the near-exponential system, there is little difference between the fit of each model. However, for strongly nonexponential behavior, the models give quite different estimates of mean and standard deviation, indicating that appropriate model choice and assessment is crucial in obtaining meaningful lifetimes from fluorescence lifetime data. Moreover, we perform simulation studies that strengthen these conclusions.

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Original languageEnglish
Pages (from-to)30282-30290
Number of pages9
JournalJournal of Physical Chemistry C
Volume118
Issue number51
DOIs
Publication statusPublished - 26 Dec 2014
Externally publishedYes

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