SPECTRAL PROPERTIES OF THE DYE ACTIVATED POLYMERS WITH ADDED FINE
SCATTERED PARTICLES, V.Bezrodny, E.Tikhonov, Physics Institute of The
Ukrainian Academy of Science; Yu.Filatov, Institute of superhard
materials of The Ukrainian Academy of Science; O.Prygodjuk,
V.Bindjukevich, Vasil P.Yashchuk, Kyiv T.Shevchenko University,
Glushkov av., 6, 03127 Kyiv, Ukraine.
The presence of strong light scattering in the active laser medium
(such as dye solution) can provoke low threshold lasing in rather
small volume. These objects are perspective for micro-laser creation.
But from the practical point of view, the solid polymer matrices
activated with dye molecules and embedded fine particles are more
convenient systems for this application. For development of such media
it is necessary to investigate in detail the radiative properties of
luminescence centres (LC) in these systems.
The luminescence spectra (LS) of dye activated (rhodamin 6G) polyviny
lacetate samples with added fine particles (~1m) were investigated
under the different scatterers weight concentration (6%¸30%). the
particles of SiO, AlO, CeO and synthetic diamond were used
as the scatterers.
LS were found to consist of three strong overlapping bands, which
correspond to different LC in the samples. These LC probably can be
assigned to monomers, dimmers and higher associations of dye
molecules. It was proved, that the scatterer's concentration
influences the LC concentration ratio, besides scatterer materials
influence the LC excitation level energy. This provides a possibility
to change the LS (and, consequently, the lasing spectrum as well) of
the same dye by means of scatterer material variation and scatterer
concentration changing. The preliminary experiments prove this