Remarks on Fluorescence Concentration Quenching of Rhodamine 6G in Methanol

Abstract

It has been shown that the concentration changes in the quantum yield η and decay time τ of fluorescence of rhodamine 6G in methanol can be explained quantitatively by non-radiative excitation energy transport (NET) from monomers to quenching centres considered as perfect traps. The good agreement of the experimental data with the theoretical curves for the critical radii ROMM = 55.4Ǻ and ROMT = 51.8Ǻ determined spectroscopically has been obtained. The excitation energy migration and the concentration dependence on the orientation factor occurring in the Förster rate for the NET have been taken into account. The nature of the quenching centres and the effect of material diffusion of active molecules on η and τ have been discussed.

Laser emission from dye-doped organic-inorganic particles of microcavity structure

“…The absorption peak at 538 nm and the shoulder peak at 506 nm wavelength are attributed to the monomer and dimer of Rhodamine 6G. Monomer/dimer ratio in pH-SiO2 particles was almost similar to those in ethanol solvent [15]. The dye content in the particles was about 1-7 x 10 -5 mol/g, which was estimated from the absorption intensity.…”

Multiply Doped Nanostructured Silicate Sol−Gel Thin Films: Spatial Segregation of Dopants, Energy Transfer, and Distance Measurements

“…This behavior is consistent with R6G concentration quenching, which is a well-documented phenomenon in dyes 37 and R6G in particular. 9, [33][34][35][36][38][39][40][41] Concentration quenching results from homotransfer (energy transfer from one R6G molecule to another one) at moderate dye concentrations and from aggregation at high concentrations. Both phenomena affect the fluorescence yield and lifetime of R6G at high concentrations, but aggregation is the major cause for concern in energy transfer studies and distance measurements according to the Förster model because R6G aggregates have spectral properties different from those of R6G "monomers".…”

Effect of surfactants on the aggregation of pyronin B and pyronin Y in aqueous solution

“…Xanthene dyes, pyronin B (PyB), pyronin Y (PyY), rose bengal (RB) dianion, rhodamine B (RhB) and fluorescein dianion, are known to undergo aggregation in aqueous solutions [7,[20][21][22][23][24]. Therefore, controlling aggregation-disaggregation processes is important in terms of spectroscopic applications.…”