LUIZ ANTONIO DE OLIVEIRA NUNES

LUIZ ANTONIO DE OLIVEIRA NUNES

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Tuneable luminescence in multicolour films
2010 - 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.
Energy transfer in tunable luminescent multicolor PMMA films doped with REsup(3+)-'beta'-diketonate complexes
2010 - BRITO, H.F.; KAI, J.; FELINTO, M.C.F.C.; NUNES, L.A.O.; MALTA, O.L.
Estudo de propriedades luminescentes de filmes nanoestruturados de PMMA e PHB dopados com [Eu(tta)sub(3)(TPPO)sub(2)]
2012 - HACHISU, GABRIEL S.; KAI, JIANG; TEOTONIO, ERCULES E.S.; NUNES, L.A.O.; MALTA, O.L.; BRITO, HERMI F.; FELINTO, MARIA C.F.C.
Investigação fotoluminescente de complexos tetrakis(ß-dicetonatos) de terras raras
2012 - PAOLINI, T.B.; GUEDES, M.A.; FELINTO, M.C.F.C.; KAI, J.; NUNES, L.A.O.; MALTA, O.L.; BRITO, H.F.
Low temperature synthesis of Rsub(2)Osub(3):Eusup(3+) (R: Y, Gd and Lu) nanophosphor using trimellitic acid precursors
2012 - SILVA, IVAN G.N.; RODRIGUES, LUCAS C.V.;; SOUZA, ERNESTO R.; KAI, JIANG; FELINTO, MARIA C.F.C.; NUNES, LUIZ A.O.; HOLSA, JORMA; BRITO, HERMI F.
Intermolecular energy transfer and photostability of luminescence-tunable multicolour PMMA films doped with lanthanide-'beta'-diketonate complexes
2011 - KAI, JIANG; FELINTO, MARIA C.F.C.; NUNES, LUIZ A.O.; MALTA, OSCAR L.; BRITO, HERMI F.
Synthesis, characterization and spectroscopic investigation of new tetrakis(acetylacetonato)thulate(III) complexes containing alkaline metals as countercations
2011 - GUEDES, M.A.; PAOLINI, T.B.; FELINTO, M.C.F.C.; KAI, J.; NUNES, L.A.O.; MALTA, O.L.; BRITO, H.F.