Effect dopant concentration on the photoluminescent properties of SrWO4:Eu 3+
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2010
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BRAZILIAN MEETING INORGANIC CHEMISTRY, 15; LATIN AMERICA MEETING ON BIOLOGICAL INORGANIC CHEMISTRY, 2nd
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Resumo
Inorganic materials doped with trivalent rare earth ions (R3+) have been
extensively applied as luminescent phosphors because exhibit high emission
intensities. Alkaline earth tungstates have shown intrinsic luminescence
mainly attributed to the ligand to metal charge transfer (LMCT) band, which
the energy can be transferred to emitting centers as the R
3+ ions. In this
work, the SrWO4 matrix doped with different concentrations of Eu3+ were
synthesized by a soft chemistry method using a simple precipitation without
any thermal treatment. The X-ray powder diffraction patterns (Fig. 1)
indicated that the main component is the Scheelite phase with high
crystallinity. Besides, the crystallite size data of the samples, calculated by
using the Scherrer formula were ca. 30 nm. The SEM micrographs were
obtained, showing high homogeneous profile for the different concentrations.
The excitation spectra showed both the OW LMCT band centered at
290 nm and the 4f6
intraconfigurational transitions of Eu3+ ion. However, the
emission spectra of the Eu3+(5 %) ion doped in SrWO4 matrix showed the
only the 5D0
7
F0-4 transitions of europium ion with similar spectral profiles
(Fig. 2) under excitations at 290 (LMCT band) and 393 nm (7
F0
5
L6). The
5D0
7
F2 transition presents highest emission intensity. Furthermore the
absence of LMCT broad emission band of SrWO4 indicating the efficient
energy transfer from the matrix to the Eu3+ emitting center. The SrWO4:Eu3+
nanocrystalline phosphors were efficiently prepared by a simple method with
high crystallinity. This luminescent material showed an efficient energy
transfer from the LMCT band to the Eu3+ ion, suggesting that these doped
systems are promising red emitting nanophosphors.
Como referenciar
CARVALHO JUNIOR, J.M.; RODRIGUES, L.C.V.; FELINTO, M.C.F.C.; BRITO, H.F. Effect dopant concentration on the photoluminescent properties of SrWOsub(4):Eusup(3+). In: BRAZILIAN MEETING INORGANIC CHEMISTRY, 15; LATIN AMERICA MEETING ON BIOLOGICAL INORGANIC CHEMISTRY, 2nd, August 16-20, 2010, Aguas de Lindoia, SP. Abstracts... Disponível em: http://repositorio.ipen.br/handle/123456789/21246. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.