Role of Oxygen in the Fluorescence Flare-up
of N-Methyl Carbazole in Binary Solvents

V. V. Nekrasov, D. R. Gasanov, and A. M. Sergeev

Karpov Research Institute of Physical Chemistry, Russian State Scientific Center,
ul. Vorontsovo pole 10, Moscow, 103064 Russia

Received June 4, 1996

Abstract—The dependences of fluorescence quantum yields for N-methyl carbazole solutions on the compo-
sition of a binary solvent with neutral and polar components are studied. It is found that the observed fluores-
cence flare-up for solutions with a higher content of the polar component is due to a slower oxygen quenching
because of a smaller content of dissolved oxygen. For oxygen-free solvents, the fluorescence quantum yield
does not vary with relative contents of the neutral and polar solvent components.

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