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Luminescence spectral properties of the two symmetrical indocyanine dyes with different substituents near nitrogen atoms have been investigated in the polyurethane matrices. The analysis of the IR-spectra, measured for the product of a reaction between indolenine salt, being a terminal heterocyclic fragment in one of these dye molecules, and phenyl isocyanate, and this salt and isocyanate as single bulk compounds has shown possibility of covalent bonding between this indocyanine and polyurethane. Such covalent bonding of the dye with the polymer matrix results in improvement of its luminescence spectral properties, compared to the dye-polymer solutions.

Luminescence spectral peculiarities of polymethine dye, bonded covalently to polyurethane matrix