Funct. Mater. 2015; 22 (4): 450-454.
Fluorescence properties of dyes for 570-800 nm lasing region in sol-gel silica
[1] Institute for Single Crystals, STC "Institute for Single Crystals ", National Academy of Sciences of Ukrainee, 60 Lenin Ave., 61001 Kharkiv, Ukraine
[2] A.Usikov Institute of Radiophysics and Electronics, National Academy of Sciences of Ukraine, 12 Acad. Proskura Str., 61085 Kharkiv, Ukraine>
[3] Institute for Scintillation Materials, STC "Institute for Single Crystals ", National Academy of Sciences of Ukraine, 60 Lenin Ave., 61001 Kharkiv, Ukraine
The spectral-fluorescence characteristics of the dyes for 570-800 nm lasing region: Rh6G, DCM, LD678, and Rh800 were studied with the purpose to clarify an influence of intermolecular interactions in SiO2 matrix on processes of the excitation energy decay of the laser dyes in S1 state. Their quantum yields Qfl and decay times τfl of fluorescence, radiative kr and non-radiative knr rate constants for solvents and matrices were measured and calculated. It was shown for the dyes with small solvent effect (Rh6G, LD678) that incorporation of them into the matrix did not cause the appreciable changes of Qfl and τfl values. While for the dyes with strong solvent effect (DCM and Rh800) - SiO2 matrix takes the stabilizing influence upon their molecules in S1 state and as a result their non-radiative losses were diminished and quantum yield was increased.
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