Red-emitting magnetic mesocomposites of Ag-decorated Fe3O4@SiO2 nanoflowers coated with Y2O3:Eu3+
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2017
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BRAZIL MRS MEETING, 16th
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The new multistep approach for co-assembling magnetic iron oxide nanoflowers
with red-emitting Y2O3:Eu3+ to form magneto-luminescent mesocomposites was
reported. The Fe3O4 core particles prepared by solvothermal method were layered
with SiO2 shell and decorated with small size spherical Ag nanoparticles as well
as further coated with Y2O3:Eu3+ lluminophore. The nanoflower shape Fe3O4 core
of size ~110 nm and crystalline cubic structure of bifunctional ironoxide@
Y2O3:Eu3+, Fe3O4@SiO2@Y2O3:Eu3+ and Fe3O4@SiO2-Ag@Y2O3:Eu3+ (1 mol%)
mesocomposites were confirmed from X-rays diffraction, EDS spectra and
transmission electron microscopy images. The static magnetic measurements
supported and manifested nonsuperparamagnetic behavior of the materials at 300
K. The iron oxides are usually luminescent quencher, therefore, the
photoluminescence properties based on the emission spectral data and
luminescence decay curves were studied. In addition, experimental intensity
parameters (Ωλ), lifetimes (τ), emission quantum efficiencies as well as radiative
(Arad) and non-radiative (Anrad) decay rates were also calculated, in order to probe
the local chemical environment of the Eu3+ ion and better understand the
phenomena of iron oxide induced luminescence quenching. The highest value of
the quantum efficiency = 74 %, for the a-Fe2O3@Y2O3:Eu3+ (1 mol%) among all the
luminescent and magnetic mesocomposites suggests that Fe2O3 is induced lower
luminescence quenching then Fe3O4. Though, the thin layer of SiO2 spacer is
caused of increase the quantum efficiency, whereas the Ag is further enhanced
the luminescence quenching by energy transfer form Eu3+ ion to the Ag
nanoparticles. These novel Eu3+ mesocomposites may act as a red emitting layer
for magnetic and light converting molecular devices.
Como referenciar
KHAN, LATIF U.; BRITO, HERMI F.; MURACA, DIEGO; COSTA, LUELC S. da; FELINTO, MARIA C.F. da C. Red-emitting magnetic mesocomposites of Ag-decorated Fe3O4@SiO2 nanoflowers coated with Y2O3:Eu3+: study of iron oxide induced luminescence quenching. In: BRAZIL MRS MEETING, 16th, September 10-14, 2017, Gramado, RS. Abstract... São Carlos, SP: Aptor Software, 2017. p. 127-127. Disponível em: http://repositorio.ipen.br/handle/123456789/31192. 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.