Preparation and caracterization of photoluminescent PVA films doped with metal-organic complex of Eu3+
Abstract
The present work focuses on the characterization of polyvinyl alcohol (PVA) polymeric matrix prepared from the dispersion of an organometallic mononuclear complex based on trivalent europium, Eu3+. The Eu3+ complexes were previously synthesized in an aqueous medium at ambient conditions using benzoate anions as organic ligands Eu(OOCC6H5)3· (H2O)3 (For practical purposes we identificó it as EuL3). Once the complex obtained in powder form was characterized, it was ultrasonically dispersed in the PVA matrix. Films with different molar ratios of the complex to the host polymer were prepared and characterized. Films of 0.5 mm thickness were obtained by the "Tape-casting" technique. Characterizations were performed by FT-IR and fluorescence spectroscopy. The PVA matrix generates a sensitization in the excitation of the Eu(OOCC6H5)3· (H2O)3. complex presenting a shift in the excitation spectrum from 288 to 280 nm; in addition, an increase in the luminescent emission was observed due to intra- or intermolecular energy transfer processes from the matrix to the active europium nuclei.
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