ANA VALÉRIA S. LOURENÇO
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Resumo IPEN-doc 14693 Sintese, caracterizacao e estudo espectroscopico do composto de GdVOsub(4) dopado com Smsup(3+)2009 - KODAIRA, CLAUDIA A.; LOURENCO, ANA V.S.; NUNES, KATIA C.; RODRIGUES, LUCAS C.V.; BRITO, HERMI F.; FELINTO, MARIA C.F.C.Resumo IPEN-doc 14678 Persistent luminescence BaAlsub(2)Osub(4):Eusup(2+), Dysup(3+) phosphor incorporated in silica: water resistance2009 - LOURENCO, A.V.S.; RODRIGUES, L.C.V.; KODAIRA, C.A.; STEFANI, R.; BRITO, H.F.; FELINTO, M.C.F.C.; HOLSA, J.Barium aluminates doped with divalent europium and trivalent dysprosium were prepared with the combustion method and then incorporated with silica using the microemulsion method. The incorporated phosphor particles showed improved water resistance, preserving much of the prior persistent luminescence properties even after interaction with water whereas the nonincorporated particles loosed the original persistent luminescence. The infrared absorption spectroscopy, X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence studies were used to characterize the phosphors. The pH of the phosphor-water mixture after the reaction with water was measured to compare the water resistance of the materials. The photoluminescence of the incorporated BaAl2O4:Eu2+,Dy3+ with water modified slightly the 4f6 5d1 →4f7 transition of Eu2+, however.Resumo IPEN-doc 16283 Encapsulation study of persistent luminescent material in silica2008 - LOURENCO, A.V.S.; RODRIGUES, L.C.V.; KODAIRA, C.A.; STEFANI, R.; CARVALHO, C.A.A.; BRITO, H.F.; FELINTO, M.C.F.C.; HOLSA, J.