title: Host dependent frequency upconversion of Er3+/Yb3+-codoped bismuth-germanate glasses.
abstract: The absorption and upconversion fluorescence spectra of a series of Er3+/Yb3+-codoped xBi(2)O(3)-(90-x)GeO2-10Na(2)O (BGN x, x=31, 36, 41, 46 and 51 mol%) glasses have been studied. Intense green and red emission bands at around 533, 548 and 659 nm, corresponding to the 2H(11/2)-->4I(15/2), 4S(3/2)-->4I(15/2) and 4F(9/2)-->4I(15/2) transitions of Er3+, respectively, were simultaneously observed at room temperature. The dependence of intensities of upconversion emission on excitation power and possible upconversion mechanisms were evaluated and analyzed. The important role of Bi(2)O(3) in upconversion intensity is observed and its influence on the green (533 and 548 nm) and red (659 nm) emissions is compared and discussed. The influence of Bi(2)O(3) on the upconversion emissions has been investigated based on the IR spectra.
authors.affiliation: Faculty of Information Science and Engineering, Ningbo University, The State Key Laboratory Base of Novel Functional Materials and Preparation Science, Ningbo 315211, China. lonelu@163.com
authors.forename: Longjun
authors.initials: L
authors.lastname: Lu
authors.forename: Qiuhua
authors.initials: Q
authors.lastname: Nie
authors.forename: Xiang
authors.initials: X
authors.lastname: Shen
authors.forename: Shixun
authors.initials: S
authors.lastname: Dai
authors.forename: Tiefeng
authors.initials: T
authors.lastname: Xu
authors.forename: Zhe
authors.initials: Z
authors.lastname: Jin
authors.forename: Yejiang
authors.initials: Y
authors.lastname: Shen
authors.forename: Xianghua
authors.initials: X
authors.lastname: Zhang
mesh_terms: D001729:Bismuth / Q000737:chemistry*; D004871:Erbium / Q000737:chemistry*; D005857:Germanium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013055:Spectrophotometry, Infrared; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D005857:Germanium; C042364:bismuth germanium oxide; D004871:Erbium; D015018:Ytterbium; D001729:Bismuth