LUIZ ANTONIO DE OLIVEIRA NUNES
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Resumo IPEN-doc 16393 Tuneable luminescence in multicolour films2010 - KAI, JIANG; NUNES, LUIZ A.O.; FELINTO, MARIA C.F.C.; MALTA, OSCAR L.; BRITO, HERMI F.Trivalent Rare Earth (RE3+) β-diketonate complexes and polymethylmetacrylate (PMMA) have been widely employed in the productions of luminescent materials. In this work, preparation, characterization and photoluminescence studies for a series of stand-free polymer thin films incorporating RE3+-β-diketonate complexes into PMMA were reported. The PMMA matrix not only immobilizes the luminescent RE3+ species via physical and chemical interactions, but also operates as co-sensitizer and enhances the characteristic monochromatic emissions arising from the 4f–4f intraconfigurational transitions of the RE3+ ions. Furthermore, it was observed colour-tuneable luminescence with the polymeric systems. Therefore, they are potentially attractive for the production of advanced photonic applications such as multicolour anti-falsification optical markers, λex.= 254 nm full range UV sensors etc. Moreover, the observation of intermolecular energy transfer from the emitter level (5D4) of Tb3+ ions to the triplet state (T1) of the Eu3+ species was unprecedented in literature.Resumo IPEN-doc 16065 Energy transfer in tunable luminescent multicolor PMMA films doped with REsup(3+)-'beta'-diketonate complexes2010 - BRITO, H.F.; KAI, J.; FELINTO, M.C.F.C.; NUNES, L.A.O.; MALTA, O.L.Artigo IPEN-doc 17726 Intermolecular energy transfer and photostability of luminescence-tunable multicolour PMMA films doped with lanthanide-'beta'-diketonate complexes2011 - KAI, JIANG; FELINTO, MARIA C.F.C.; NUNES, LUIZ A.O.; MALTA, OSCAR L.; BRITO, HERMI F.Artigo IPEN-doc 17728 Synthesis, characterization and spectroscopic investigation of new tetrakis(acetylacetonato)thulate(III) complexes containing alkaline metals as countercations2011 - GUEDES, M.A.; PAOLINI, T.B.; FELINTO, M.C.F.C.; KAI, J.; NUNES, L.A.O.; MALTA, O.L.; BRITO, H.F.