Сверхкритические флюиды. Теория и практика
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2019, N3, pp. 32-44

A.O. Rybaltovskii, A.A. Akovantseva, E.N. Bolbasov, V.M. Buznik, Y.S. Zavorotny, N.V. Minaev, A.G. Mirochnik, A.A. Sergeev, S.I. Tverdokhlebov, V.I. Yusupov

Highly Porous Fluorescent Materials Based on Polymer Matrices Impregnated with Eu(DBM)3 Molecules in Supercritical Carbon Dioxide Medium

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.

Key words: europium ions, photoluminescence, polymer films, supercritical carbon dioxide, polytetrafluoroethylene, fibrous materials, foam-like structures

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