Key words: europium ions, photoluminescence, polymer films, supercritical carbon dioxide, polytetrafluoroethylene, fibrous materials, foam-like structures
The possibility of making luminescent films by doping highly porous polymer materials
with Eu(dbm)3·H2O (I) complex in the supercritical carbon dioxide medium using ethanol
as a co-solvent is demonstrated. The initial polymer samples were polytetrafluoroethylene
films obtained by thermal spraying or electrospinning and polybenzimidazole
films with foam-like structures obtained using laser irradiation. Deposition of Eu
complex in the pores of such materials (up to several microns in size) leads to the
appearance of a bright characteristic photoluminescence (PL) in the red region, the
intensity of which depends on the method of impregnation and the subsequent
processing of the samples. An analysis of the intensity ratio of the electric dipole and
magnetic dipole components of the PL spectra allowed us to draw conclusions about
changes in the nearest environment of Eu3+ ions in each of the studied host materials.
doi:10.1134/S1990793120070155