Publication:
Synthesis of Cerium-Activated Yttrium Aluminate Based Fine Phosphors by an Aerosol Route

Simple item page
dc.affiliation.dptoUC3M. Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Químicaes
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Tecnología de Polvoses
dc.contributor.authorMancic, Lidija
dc.contributor.authorLojpur, Vesna
dc.contributor.authorBarroso, Ignacioes
dc.contributor.authorRabanal Jiménez, María Eugeniaes
dc.contributor.authorMilosevic, Olivera
dc.date.accessioned2015-05-08T10:26:33Z
dc.date.available2015-05-08T10:26:33Z
dc.date.issued2012-06
dc.description.abstractPolycrystalline fine powders of yttrium aluminate doped with Ce³⁺ were synthesised by spray pyrolysis of a polymeric pre-cursor, which was obtained by dissolving the corresponding nitrates in a solution of ethylenediaminetetraacetic acid (EDTA) in ethylene glycol (EG). Aerosol decomposition was performed at 550 °C followed by an additional thermal treat-ment (900–1100 °C). The yield of either a single yttrium alu-minium perovskite (YAP) phase or a single yttrium alumin-ium garnet (YAG) phase was investigated as a function of the predefined yttrium/aluminium ratio, the cerium doping concentration, the processing temperature, and the thermal-treatment regime, which included the variation of the heat-ing and cooling rates (dT/dt), the residence time (τ), and the atmosphere. Changes in the composition and structure of the precursor during thermal decomposition were investigated by thermogravimetric and differential thermal analysis (TGA/DTA) and FTIR spectroscopy. The particle morphology and structure were analysed by a combination of scanning electron microscopy and energy-dispersive X-ray spec-troscopy (SEM/EDS) and by highresolution transmission electron microscopy (HR-TEM). The structural refinement was based on the phase identification performed by X-ray powder diffraction (XRPD). The emission spectra were re-corded within the range 325–800 nm by applying excitation wavelengths of 297 (YAP) and 450 nm (YAG). The employed synthesis conditions assured the formation of spherical, non-agglomerated particles with well-developed surfaces and diameters between 200 and 800 nm. For a predefined Y/Al ratio of 1:1, lower processing temperatures combined with longer heat treatments under stationary conditions resulted in a multiphase system, composed of YAP, YAG, and mono-clinic yttrium aluminate (YAM) phases. However, a short heat treatment with a high heating rate (200 °C/min) at higher temperatures results in the formation of a kinetically favoured pure YAP hexagonal phase. On the other hand, for a predefined Y/Al ratio of 3:5, the generation of a thermody-namically favoured pure YAG phase has been confirmed, re-gardless of the applied heat-treatment conditions. Although incomplete, Ce³⁺ introduction into the host matrix has been detected by XRPD and luminescence measurements.en
dc.description.sponsorshipThe authors gratefully acknowledge the Ministry of Science and Education of the Republic of Serbia (Project No 172035), the University Carlos III (Madrid, Spain), and the Santander Bank (Chairs of Excellence Program for the academic year 2010–2011) for financial supporten
dc.format.extent9
dc.format.mimetypeapplication/pdf
dc.identifier.bibliographicCitationEuropean Journal of Inorganic Chemistry (2012). 2012(16), 2716-2724.es
dc.identifier.doi10.1002/ejic.201101053
dc.identifier.issn1099-0682 (online)
dc.identifier.issn1434-1948 (print)
dc.identifier.publicationfirstpage2716
dc.identifier.publicationissue16
dc.identifier.publicationlastpage2724
dc.identifier.publicationtitleEuropean journal of inorganic chemistryen
dc.identifier.publicationvolume2012es
dc.identifier.urihttps://hdl.handle.net/10016/20655
dc.identifier.uxxiAR/0000009998
dc.language.isoengen
dc.publisherWileyen
dc.relation.publisherversionhttp://dx.doi.org/10.1002/ejic.201101053
dc.rights© 2012 Wiley-VCH Verlag GmbH & Co.en
dc.rights.accessRightsopen accessen
dc.subject.ecienciaMaterialeses
dc.subject.otherYttrium aluminatesen
dc.subject.otherNano-particlesen
dc.subject.otherLuminescenceen
dc.subject.otherPolymerizationen
dc.subject.otherSpray pyrolysisen
dc.titleSynthesis of Cerium-Activated Yttrium Aluminate Based Fine Phosphors by an Aerosol Routeen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
synthesis_EJIC_2012_ps.pdf
Size:
1.3 MB
Format:
Adobe Portable Document Format
Download
Collections
DCIMIQ - CIMIQ - TP - Artículos de Revistas