title: Efficient visible upconversion luminescence in Er3+ and Er3+/Yb3+ co-doped Y2O3 phosphors obtained by solution combustion reaction.
abstract: Combustion derived Er(3+) -doped Y2O3 and Er(3+)/Yb(3+)co-doped Y2O3 powders have been characterized by X-ray diffraction, energy dispersive X-ray analysis, Fourier transform infrared spectroscopy and laser excited spectroscopy. Formation of Y2O3 phosphor was confirmed by X-ray diffraction and energy dispersive X-ray analysis. The vibrational properties of Y2O3 powder was studied by Fourier transform infrared spectroscopy. The luminescence spectra of Er(3+) -doped and Er(3+)/Yb(3+) co-doped Y2O3 powders were studied under 379nm excitation. The strong up-conversion luminescence for Er(3+) -doped and Er(3+)/Yb(3+) co-doped Y2O3 powders have been observed under 978nm laser excitation. The effect of Yb(3+) addition on optical and luminescence properties of Er(3+):Y2O3 powders were studied. The ratio of red to green intensity has been enhanced when Er(3+) -doped Y2O3 is co-doped with Yb(3+) ions. The effect of co-doping of Yb(3+) ions on the visible luminescence intensity of Er(3+) has been studied and the mechanism responsible for the variation in the green and red intensity is discussed.
authors.affiliation: Department of Chemical Engineering, Konkuk University, Seoul 143-701, Republic of 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: P
authors.initials: P
authors.lastname: Haritha
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 Chemical Engineering, Konkuk University, Seoul 143-701, Republic of Korea. Electronic address: sanghhkim@konkuk.ac.kr.
authors.forename: S H
authors.initials: SH
authors.lastname: Kim
mesh_terms: D002412:Cations / Q000737:chemistry; D004871:Erbium / Q000737:chemistry*; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements; D014961:X-Ray Diffraction; D015018:Ytterbium / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry*
chemical_list: D002412:Cations; D049408:Luminescent Agents; D015019:Yttrium; D004871:Erbium; D015018:Ytterbium; C091417:yttria
keywords: Combustion; Er(3+); Up-conversion; Y(2)O(3); Yb(3+)