Fluorescence quantum yield of rhodamine 6G in ethanol as a function of concentration using thermal lens spectrometry

Thermal lens spectrometry has been used to measure the fluorescence quantum yield of rhodamine 6G in ethanol. The absolute Φf (0.94), obtained at low concentrations, is found to be independent of concentration up to 2 × 10−4 M. Relative fluorescence experiments corrected for inner-filter effects corroborate the photothermal data.