title: Up-conversion luminescence analysis in ytterbium-sensitized erbium-doped oxide-halide tellurite and germanate-niobic-lead glasses.
abstract: Ytterbium-sensitized erbium-doped oxide-halide tellurite and germanate-niobic-lead glasses have been synthesized by conventional melting method. Intense green and red emissions centered at 525, 546 and 657 nm, corresponding to the transitions 2H11/2-->4I15/2, 4S3/2-->4I15/2 and 4F9/2-->4I15/2, respectively, were simultaneously observed at room temperature in these glasses. The quadratic dependence of the 525, 546 and 657 nm emissions on excitation power indicates that a two-photon absorption process occurs. Tellurite glass showed a weaker up-conversion emission than germanate-niobic-lead glass, which is inconsistent with the prediction from the difference of maximum phonon energy between tellurite and germanate-niobic-lead glasses. In this paper, Raman spectroscopy was employed to investigate the origin of the difference in up-conversion luminescence in the two glasses. Compared with phonon side-band spectroscopy, Raman spectroscopy extracts more information including both phonon energy and phonon density. Our results reveal that the phonon density and the maximum phonon energy of host glasses are both important factors in determining the up-conversion efficiency.
authors.affiliation: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, PR China. htsun2003@eyou.com
authors.forename: Hongtao
authors.initials: H
authors.lastname: Sun
authors.forename: Chunlei
authors.initials: C
authors.lastname: Yu
authors.forename: Gang
authors.initials: G
authors.lastname: Zhou
authors.forename: Zhongchao
authors.initials: Z
authors.lastname: Duan
authors.forename: Meisong
authors.initials: M
authors.lastname: Liao
authors.forename: Junjie
authors.initials: J
authors.lastname: Zhang
authors.forename: Lili
authors.initials: L
authors.lastname: Hu
authors.forename: Zhonghong
authors.initials: Z
authors.lastname: Jiang
mesh_terms: D004871:Erbium / Q000737:chemistry*; D005857:Germanium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D007477:Ions; D007854:Lead / Q000737:chemistry*; D049449:Luminescence; D009556:Niobium / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D013691:Tellurium / Q000737:chemistry*; D013696:Temperature; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D007477:Ions; D005857:Germanium; D009556:Niobium; D007854:Lead; D004871:Erbium; C026660:tellurous acid; D015018:Ytterbium; D013691:Tellurium