LUIZ ANTONIO DE OLIVEIRA NUNES

LUIZ ANTONIO DE OLIVEIRA NUNES

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Structure-property relationship of luminescent zirconia nanomaterials obtained by sol-gel method
2015 - CARVALHO, JOSE M.; RODRIGUES, LUCAS C.V.; FELINTO, MARIA C.F.C.; NUNES, LUIZ A.O.; HOLSA, JORMA; BRITO, HERMI F.
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.
Low temperature synthesis of Ysub(2)Osub(3):Eusup(3+) nanophosphor using tricarboxylate precursor
2010 - BRITO, H.F.; RODRIGUES, L.C.V.; SILVA, I.G.N.; SOUZA, E.R.; KAL, J.; FELINTO, M.C.F.C.; NUNES, L.A.O.
Valence control of Pr in ZrOsub(2) by Gdsup(3+) Co-Doping
2012 - CARVALHO, JOSE M.; LASTUSAARI, MIKA; LAAMANEN, TANELI; RODRIGUES, LUCAS C.V.; HOLSA, JORMA; FELINTO, MARIA C.F.C.; NUNES, LUIZ A.O.; BRITO, HERMI
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.
Temperature dependent ligand to metal energy transfer rates in lanthanide complexes: theoretical modeling and the first direct experimental observation
2012 - FAUSTINO, W.M.; NUNES, L.A.O.; FELINTO, M.C.F.C.; BRITO, H.F.; MALTA, O.L.
Synthesis, characterization and spectroscopic studies of tin/titanium mixed oxide nanoparticles doped with europium for use in biomarkers
2012 - PAGANINI, PAULA P.; RODRIGUES, LUCAS C.V.; HOLSA, JORMA; NUNES, LUIZ A.O.; MALTA, OSCAR L.; BRITO, HERMI F.; FELINTO, MARIA C.F.C.
Study of quantum dota based on tin/yttrium mixed oxide doped with terbium to be used as biomarker
2009 - PAGANINI, PAULA P.; FELINTO, MARIA C.F.C.; KODAIRA, CLAUDIA A.; BRITO, HERMI F.; NUNES, LUIZ A.O.
Influence of titanium and lutetium on the persistent luminescence of ZrOsub(2)
2011 - CARVALHO, JOSE M.; RODRIGUES, LUCAS C.V.; HOLSA, JORMA; LASTUSAARI, MIKA; NUNES, LUIZ A.O.; FELINTO, MARIA C.F.C.; MALTA, OSCAR L.; BRITO, HERMI F.