Solvent effect on absorption and fluorescence spectra of coumarin laser dyes: Evaluation of ground and excited state dipole moments

Solvent effect on the spectral properties of dipolar laser dyes: Evaluation of ground and excited state dipole moments

“…Solvent polarity is the most significant property which can alter the position of the absorption or emission band of molecules by solvating a solute molecule or any other molecular species introduced into the solvent milieu. Numerous articles on the studies of simple organic molecules with regard to their interactions in different solvents are reported in literature [2][3][4][5][6][7][8][9]. On the other hand, the fluorescent dye molecules are complex organic molecules which might carry charge centers and are thus prone to absorption changes in different media [10,11].…”

Spectral and quantum-mechanical characterizations of 7-amino-4-trifluoromethyl coumarin

“…Biological and chemical sensors, fluorescent probes and laser dyes, are some of their applications [8,9]. Coumarin dyes' solvatochromism is due to the change in electronic distribution resulting in an increase of dipole moments from ground state into excited state [10,11].…”

Photoluminescence properties of polystyrene-hosted fluorophore thin films

“…Such intramolecular charge transfer (ICT) from the ground to excited state increases the dipole moment of the molecule and therefore, contributes to the magnitude of the Stokes shift of fluorescence emission. 4,5 The relaxation to ground state (S*→S) may take different radiative and non-radiative energy transition pathways, the radiative pathway leading to fluorescence. The non-radiative decay is strongly dependent on the local environment of the fluor molecule.…”