Fluorescence spectroscopy of Rhodamine 6G: concentration and solvent effects.
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.
School of Engineering, University of Aberdeen, Fraser Noble Building, Aberdeen AB24 3UE, Scotland, United Kingdom.
Florian M
FM
Zehentbauer
School of Engineering, University of Aberdeen, Fraser Noble Building, Aberdeen AB24 3UE, Scotland, United Kingdom.
Claudia
C
Moretto
School of Engineering, University of Aberdeen, Fraser Noble Building, Aberdeen AB24 3UE, Scotland, United Kingdom.
Ryan
R
Stephen
School of Engineering, University of Aberdeen, Fraser Noble Building, Aberdeen AB24 3UE, Scotland, United Kingdom.
Thangavel
T
Thevar
Gilden Photonics, 9 South Avenue, Clydebank Business Park, Clydebank G81 2NR, Scotland, United Kingdom.
John R
JR
Gilchrist
School of Engineering, University of Aberdeen, Fraser Noble Building, Aberdeen AB24 3UE, Scotland, United Kingdom.
Dubravka
D
Pokrajac
Magdalen College School, Oxford, United Kingdom.
Katherine L
KL
Richard
School of Engineering, University of Aberdeen, Fraser Noble Building, Aberdeen AB24 3UE, Scotland, United Kingdom; Erlangen Graduate School in Advanced Optical Technologies, University of Erlangen-Nuremberg, 91052 Erlangen, Germany. Electronic address: j.kiefer@abdn.ac.uk.
Johannes
J
Kiefer
D004396:Coloring Agents / Q000737:chemistry; D008968:Molecular Conformation; D012235:Rhodamines / Q000737:chemistry*; D012815:Signal Processing, Computer-Assisted; D012997:Solvents / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D014867:Water / Q000737:chemistry
D004396:Coloring Agents; D012235:Rhodamines; D012997:Solvents; C026188:rhodamine 6G; D014867:Water
Alcohol; Dye laser; Flow visualization; Laser-induced fluorescence; Rhodamine 590; Rhodamine 6G