Fluorescence quantum yield of oxazine and carbazine laser dyes

Abstract The structural features responsible for radiationless deactivation in Oxazine and Carbazine dyes are determined by measurement of the fluorescence quantum yield in various solvents and at different temperatures. A distinction can be made between temperature-independent radiationless processes involving H-vibrations and temperature-dependent processes which have their origin in a lack of rigidity of the molecular skeleton.