ArticleJournal of fluorescence2026
Tuning the Absorption and Emission Characteristics of Laser Dye Rhodamine 6G Using Ionic Liquids.
Article in Journal of fluorescence, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The central idea of the present work was to study the effect of ionic liquids (ILs) on the photophysical behavior of a scientifically and industrially important Rhodamine 6G (R6G) dye. The photophysical behavior of R6G dye was studied in water, different organic solvents and the effect of addition of the small amount of hydrophilic as well as hydrophobic ILs was also studied on the photophysical behavior of the dye dissolved into water. The absorption and fluorescence emission characteristics of the dye were found to depend upon the dye concentration, nature of the solvent media, and the identity of the small amount of IL present into the aqueous solutions of the dye. Furthermore, the fluorescence emission spectra of the dye were found to be excitation independent. More interestingly, the emission characteristics for the R6G dimer were found to be IL identity dependent. More specifically, the presence of small amount of [PF6]−, [Tf2N]− based hydrophobic ILs into concentrate aqueous solutions of the dye resulted into fluorescence emission corresponding to the dimer whereas no such emission corresponding to dimer was observed for the presence of hydrophilic ILs containing [BF4]− and [OTf]− as anions. The hydrophobicity of the added ILs and the interactions between the constituent of ILs and dye molecules might be the reason for non-fluorescent nature of R6G dimer in aqueous solutions in presence of [BF4]− and [OTf]− based hydrophilic ILs as opposed to fluorescent nature of dimer in the presence of small amount of [PF6]−, [Tf2N]− based hydrophobic ILs. Furthermore, a decrease in the non-radiative decay rates in presence of [PF6]−, [Tf2N]− might be the reason for weakly fluorescent nature of the dimer. The non-fluorescent nature of the R6G dimer limits the scientific and industrial application of the dye therefore the present study could contribute in improving these applications by controlling the emission characteristics of the R6G dimer using ILs.
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