Microwave synthesis of Y2O3:Eu3+ nanophosphors: A study on the influence of dopant concentration and calcination temperature on structural and photoluminescence properties
2016 (English)In: Journal of Luminescence, ISSN 0022-2313, E-ISSN 1872-7883, Vol. 169, 1-8 p.Article in journal (Refereed) Published
Red fluorescent emitting monodispersed spherical Y<inf>2</inf>O<inf>3</inf> nanophosphors with different Eu3+ doping concentrations (0-13 mol%) are synthesized by a novel microwave assisted urea precipitation, which is recognized as a green, fast and reproducible synthesis method. The effect of Eu3+ doping and calcination temperature on the structural characteristics and luminescence properties of particles is investigated in detail. The as prepared powders have (Y,Eu)(OH)(CO<inf>3</inf>) structure which converts to Y<inf>2</inf>O<inf>3</inf>:Eu3+ from 500 °C and become crystalline at higher temperatures. The crystallite size of nanophosphors increased from 15 nm to 25 nm as the calcination temperature increased from 700 °C to 1050 °C. The efficient incorporation of Eu3+ ions in cubic Y<inf>2</inf>O<inf>3</inf> host matrix is confirmed by the calculated X-ray Powder diffraction (XRPD) structural parameters. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) micrographs show that the as obtained and calcined particles are spherical, monodispersed and non-agglomerated. The overall size of particles increases from 61±8 nm to 86±9 nm by increasing Eu3+ concentration from 0 mol% to 13 mol%. High resolution TEM revealed polycrystalline nature of calcined particles. The particles exhibit a strong red emission under ultraviolet (UV) excitation. The photoluminescence (PL) intensity of the peaks increases proportionally with Eu3+ concentration and the calcination temperature with no luminescence quenching phenomenon observed even for Y<inf>2</inf>O<inf>3</inf>:13%Eu3+. The fluorescent emission properties combined with the monodispersity and narrow size distribution characteristics make the Y<inf>2</inf>O<inf>3</inf>:Eu3+ heavy metal free nanophosphors applicable in fluorescence cell imaging and as fluorescence biolabels.
Place, publisher, year, edition, pages
2016. Vol. 169, 1-8 p.
Chemical synthesis, Luminescence, Microstructure, Optical properties, Phosphors, Rare earth compounds, Calcination, Chemical compounds, Crystallite size, Electron microscopy, Fluorescence, Heavy metals, High resolution transmission electron microscopy, Light emission, Photoluminescence, Powder metals, Scanning electron microscopy, Structural properties, Synthesis (chemical), Transmission electron microscopy, Urea, X ray powder diffraction, Calcination temperature, Luminescence properties, Luminescence quenching, Narrow size distributions, Photoluminescence intensities, Photoluminescence properties, Structural characteristics, Ultraviolet excitations, Europium
IdentifiersURN: urn:nbn:se:kth:diva-175601DOI: 10.1016/j.jlumin.2015.08.059ISI: 000365604700001ScopusID: 2-s2.0-84941767189OAI: oai:DiVA.org:kth-175601DiVA: diva2:866507
QC 201511032015-11-032015-10-192016-01-19Bibliographically approved