title: Near-infrared luminescence from Y2O3:Eu3+, Yb3+ prepared by sol-gel method.
abstract: Eu3+ and Yb3+ codoped Y2O3 phosphors were synthesized by the sol-gel method. The phosphors possess absorption in the region of 300-550 nm, exhibiting an intense NIR emission of Yb3+ around 1000 nm, which is suitable for matching the maximum spectral response of c-Si solar cells. The optimum composition of Eu3+ and Yb3+ codoped Y2O3 was (Y1.94Yb0.04Eu0.02)2O3. It is observed that two-step energy transfer occurs from the 5D2 level of Eu3+ situated around (466 nm) exciting two neighboring Yb3+ ions to the 2F5/2 level (1000 nm). The down-conversion material based on Eu(3+)- Yb3+ couple may have great potential applications in c-Si solar cells to enhance their photovoltaic conversion efficiency via spectral modification.
authors.forename: Ying
authors.initials: Y
authors.lastname: Xie
authors.forename: Lin J
authors.initials: LJ
authors.lastname: Xiao
authors.forename: Feng Q
authors.initials: FQ
authors.lastname: Yan
authors.forename: Yong J
authors.initials: YJ
authors.lastname: Chen
authors.forename: Wen Z
authors.initials: WZ
authors.lastname: Li
authors.forename: Xiu J
authors.initials: XJ
authors.lastname: Geng
mesh_terms: D003460:Crystallization / Q000379:methods; D005063:Europium / Q000737:chemistry*; D007259:Infrared Rays; D008163:Luminescent Measurements / Q000379:methods*; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D044367:Phase Transition; D013499:Surface Properties; D015018:Ytterbium / Q000737:chemistry*; D015019:Yttrium / Q000737:chemistry*
chemical_list: D005063:Europium; D015019:Yttrium; D015018:Ytterbium