title: Intense up-conversion luminescence in Er3+/Yb3+ co-doped CeO2 powders.
abstract: The Er(3+) and Er(3+)/Yb(3+) co-doped CeO2 powders have been prepared by a urea combustion route. The structural, morphological, compositional and vibrational analysis of the Er(3+):CeO2 and Er(3+)/Yb(3+):CeO2 powders have been studied by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray and Fourier transform infrared spectroscopy. The optical and luminescence properties of Er(3+):CeO2 and Er(3+)/Yb(3+):CeO2 powders have been studied by using laser excited spectroscopy. The effects of Yb(3+) doping on up-conversion luminescence of Er(3+) co-doped CeO2 powders were studied. The ratio of red to green intensity is decreased in Er(3+):CeO2 whereas the ratio is increased in Er(3+)/Yb(3+):CeO2 powders with increase of power. The effect of co-doping with the Yb(3+) ions on the visible luminescence of Er(3+) and the energy transfer mechanism responsible for the variation in the green and red intensity are discussed. The results indicate that these materials may be suitable for display and light emitting devices.
authors.affiliation: Department of Chemical Engineering, Konkuk University, Seoul 143-701, Korea. Electronic address: vijayjiin2006@yahoo.com.
authors.forename: Vijay
authors.initials: V
authors.lastname: Singh
authors.affiliation: Department of Physics, Yogi Vemana University, Kadapa 516 003, India.
authors.forename: M
authors.initials: M
authors.lastname: Rathaiah
authors.affiliation: Department of Physics, Yogi Vemana University, Kadapa 516 003, India.
authors.forename: V
authors.initials: V
authors.lastname: Venkatramu
authors.affiliation: Department of Inorganic Chemistry I-Materials Research, Institute of Chemistry, University of Osnabrueck, Barbarastrabe 7, 49069 Osnabrueck, Germany.
authors.forename: Markus
authors.initials: M
authors.lastname: Haase
authors.affiliation: Department of Chemical Engineering, Konkuk University, Seoul 143-701, Korea. Electronic address: sanghhkim@konkuk.ac.kr.
authors.forename: S H
authors.initials: SH
authors.lastname: Kim
mesh_terms: D002412:Cations / Q000737:chemistry; D002563:Cerium / Q000737:chemistry*; D004871:Erbium / Q000737:chemistry*; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D011208:Powders; D014961:X-Ray Diffraction; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D002412:Cations; D049408:Luminescent Agents; D011208:Powders; D002563:Cerium; C030583:ceric oxide; D004871:Erbium; D015018:Ytterbium
keywords: CeO(2); Combustion; Er(3+) ions; Up-conversion; XRD; Yb(3+) ions