Fluorescence Spectroscopy of Rhodamine 6G: Concentration and Solvent Effects

Florian M. Zehentbauer, Claudia Moretto, Ryan Stephen, Thangavel Thevar, John R. Gilchrist, Dubravka Pokrajac, Katherine L. Richard, Johannes Kiefer

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159 Citations (Scopus)


Rhodamine 6G (R6G), also known as Rhodamine 590, is one of the most frequently used dyes for application in dye lasers and as a fluorescence tracer, e.g., in the area of environmental hydraulics. Knowing the spectroscopic characteristics of the optical emission is key to obtaining high conversion efficiency and measurement accuracy, respectively. In this work, solvent and concentration effects are studied. A series of eight different organic solvents (methanol, ethanol, n-propanol, iso-propanol, n-butanol, n-pentanol, acetone, and dimethyl sulfoxide (DMSO)) are investigated at constant dye concentration. Relatively small changes of the fluorescence spectrum are observed for the different solvents; the highest fluorescence intensity is observed for methanol and lowest for DMSO. The shortest peak wavelength is found in methanol (568 nm) and the longest in DMSO (579 nm). Concentration effects in aqueous R6G solutions are studied over the full concentration range from the solubility limit to highly dilute states. Changing the dye concentration provides tunability between ∼550 nm in the dilute case and ∼620 nm at high concentration, at which point the fluorescence spectrum indicates the formation of R6G aggregates.
Original languageEnglish
Pages (from-to)147-151
Number of pages5
JournalSpectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Early online date25 Oct 2013
Publication statusPublished - 5 Mar 2014

Bibliographical note

This work was supported by the Scottish Funding Council (SFC) through the Scottish Sensor System Centre (SSSC). The authors thank Andrew Keating and Kevin Lynch of Gilden Photonics for their technical assistance and helpful discussions.


  • Rhodamine 6G
  • Rhodamine 590
  • alcohol
  • laser-induced fluorescence
  • flow visualization
  • dye laser


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