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.
High luminescence intensity of the Tetrakis (Diketonate) rare earth complexes containing Lisup(+), Nasup(+) and Ksup(+) ions as countercations
2010 - PAOLINI, T.B.; GUEDES, M.A.; FELINTO, M.C.F.C.; NUNES, L.A.O.; MALTA, O.L.; BRITO, H.F.
Controle da valência do íon Tb e das propriedades ópticas em materiais do tipo Zrsub(0,99-x)RxTbsub(0,01)Osub(2)(R: Gd ou Yb)
2012 - CARVALHO, JOSE M.; TERRA, IDELMA A.A.; BORRERO GONZALEZ, LUIS J.; RODRIGUES, LUCAS C.V.; HOLSA, JORMA; NUNES, LUIZ A.O.; FELINTO, MARIA C.F.C.; BRITO, HERMI F.
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.
Persistent luminescence mechanism of the CdSiOsub(3):Tbsup(3+) phosphors
2011 - RODRIGUES, L.C.V.; BRITO, H.F.; HOLSA, J.; STEFANI, R.; FELINTO, M.C.F.C.; LASTUSAARI, M.; MALKAMAKI, M.; NUNES, L.A.O.
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.