title: Study of upconversion fluorescence property of novel Er3+/Yb3+ co-doped tellurite glasses.
abstract: Er3+/Yb3+ co-doped TeO2-B2O3-Nb2O5-ZnO (TBN) glasses were prepared. The absorption spectra and upconversion luminescence spectra of TBN glasses were measured and analyzed. The upconversion emission bands centered at 530, 546 and 658 nm were observed under the excitation at 975 nm, corresponding to the transitions of 2H11/2-->4I15/2, 4S3/2-->4I15/2 and 4F9/2-->4I15/2 respectively. The ratio of red emission to green emission increases with an increasing of Yb3+ ions concentration. According to the quadratic dependence on excitation power, the possible upconversion mechanisms and processes were discussed.
authors.affiliation: College of Information Science and Engineering, Ningbo University, Ningbo 315211, China.
authors.forename: Tie-Feng
authors.initials: TF
authors.lastname: Xu
authors.forename: Guang-Po
authors.initials: GP
authors.lastname: Li
authors.forename: Qiu-Hua
authors.initials: QH
authors.lastname: Nie
authors.forename: Xiang
authors.initials: X
authors.lastname: Shen
mesh_terms: D004871:Erbium / Q000737:chemistry*; D005453:Fluorescence; D005898:Glass / Q000737:chemistry*; D013053:Spectrophotometry; D013691:Tellurium / Q000737:chemistry*; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D004871:Erbium; C026660:tellurous acid; D015018:Ytterbium; D013691:Tellurium