Abstract
The absorption and fluorescence
spectra of acridine orange, proflavine, and rhodamine B have been studied with
particular attention being paid to the acid-base properties of these dyes in
polar and non-polar solvents. These studies show that the neutral acridine dyes
do not form dimers but they are readily protonated even in non-polar solvents
due to traces of water which are difficult to remove. Attempts to achieve laser
emission form the acridine dyes were unsuccessful, probably because of their
low fluorescence quantum yields. Suggestions are made for optimizing the laser
efficiency of rhodamine B in various alcohol solutions at low temperatures.
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