Spectroscopic and lasing features of active media doped with benzopyrone derivatives

The investigated spectroscopic and lasing characteristics of a series of the benzopyrone derivatives in solvents of the various polarity and proton donating activity have been analyzed and generalized in this work. The measurements which we carried out have shown that the proton donating solvents have the greatest influence on the absorption-fluorescence parameters and spectral-power lasing characteristics of these derivatives. In which case the dye molecule structure exerts essential influence over intermolecular interactions of the excited benzopyrone derivative molecule with environmental solvent molecules, which occur in the solution. So, for example, the rigid fixation of the diethylamino group in the molecule structure of the investigated derivatives results not only in the long-wavelength shift of the absorption, fluorescence and lasing spectra, but also changes the non-radiative deactivation processes of the electron excitation of the molecule in the high singlet state in the proton-donating solvents. Derivatives with the free diethylamino group reduce the lasing energy sharply in such solvents, and ones with this group fixed rigidly in the molecule structure-increase it.