Submicro-crystals of BaWO4:Eu3+ and BaMoO4:Eu3+ synthetized by Pechini Method
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2017
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INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th
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In the scheelite-related red phosphors, molybdate and tungstate are respectable high-quality
host material. The central metal ions, Mo6+ and W6+, are coordinated to four oxygen atoms in
tetrahedral symmetry (Td). Then, molybdate and tungstate demonstrate be chemically stable,
red-emitting phosphors, very suitable for in lightening and bio-application.[1] Additionally,
molybdate and tungstate phosphors have broad absorption bands owing to charge transfer (CT)
from oxygen to metal in the near-UV region. Scheelite BaMoO4 and BaWO4 have almost ideal
structure of the MO4
2− and display excellent thermal and hydrolytic stability [2-3]. Rare Earth
Molybdates and Tungstate x%Eu:(BaMO4)3 submicron materials with smart photoluminescent
properties were prepared using Pechini method. The powders were characterized by XRD,
infrared absorption spectroscopy, thermal analyses, Scanning Electronic Microscopy and a
criterions study of PL properties. These rare earth doped materials present highly intense red
(Eu3+), luminescence under UV radiation. The structure change with the concentration of
dopand, in this case concentration of Eu3+. The excitation spectra of these compounds presented
broad bands arising from ligand–to–metal charge transfer (O→Mo6+, O→W6+ and O→Eu3+)
and narrow bands related to 4f–4f intraconfigurational transitions. The emission spectra
exhibited the 5D0→7FJ (J= 1–4) transitions, for the systems doped with Eu3+, while a broad band
assigned to the LMCT (O→Mo;W) are observed when the excitation is monitored on the
O→Mo;W LMCT state around 286 nm
Como referenciar
FELINTO, M.C.F.C.; MOREIRA, R.P.; BONTURIM, E.; BARBOSA, H.P.; BRITO, H.F.; TEOTONIO, E.E.S.; MALTA, O.M.L. Submicro-crystals of BaWO4:Eu3+ and BaMoO4:Eu3+ synthetized by Pechini Method. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th, August 27 - September 1, 2017, João Pessoa, PB. Abstract... Disponível em: http://repositorio.ipen.br/handle/123456789/27987. Acesso em: 23 May 2024.
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