Funct. Mater. 2014; 21 (1): 36-41.
Spectral properties of nanoporous SiO2 matrices with polymethine dye molecules
Institute for Single Crystals, STC "Institute for Single Crystals", National Academy of Sciences of Ukraine, 60 Lenin Ave., 61001 Kharkiv, Ukraine
[1] Institute for Scintillation Material, STC "Institute for Single Crystals", National Academy of Sciences of Ukraine, 60 Lenin Ave., 61001 Kharkiv, Ukraine
[2] Institute of Organic Chemistry, National Academy of Sciences of Ukraine, 5 Murmanskaya Str., 253660 Kyiv-94, Ukraine
[3] Laboratoire des Sciences des Procedes et des Materiaux, CNRS, 13 Universite Paris, Sorbone Paris Cite, France
SiO2 matrices with PM1, PM2 and PM3 polymethine dyes are synthesized. The dyes PM2 and PM3 are found to form H-aggregates and dimers, respectively, in aqueous solutions. PM1 dye forms neither H-aggregates nor dimmers due to peculiarities of its structure. The luminescence maximum of PM1 dye in the matrix is shown to be hypsochromically shifted with respect to that in the solution. A rigid structure of SiO2 matrix suppresses rotation of PM1 dye molecules, that increases the lifetime of the excited states of the dye molecules by 1.6 times in comparison with the one in the solutions.
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