title: Thermal stability, Judd-Ofelt theory analysis and spectroscopic properties of a new Er3+/Yb3+-codoped germano-tellurite glass.
abstract: The Er3+/Yb3+-codoped 70TeO2-5Li2O-10B2O3-15GeO2 glass was prepared. The thermal stability, absorption spectra, emission spectra and up-conversion spectra were measured and investigated. The Judd-Ofelt analysis based on absorption spectra was performed in order to determine the Judd-Ofelt intensity parameters Omega(t) (t = 2, 4, 6), spontaneous emission probability, radiative lifetime and branching ratios of several Er3+ transitions. It was found that this studied glass has good thermal stability, broad fluorescence full width at half maximum (FWHM), large stimulated emission cross-section and strong up-conversion emissions at about 532, 546 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 under the excitation at 970 nm. The results suggest that this Er3+/Yb3+-codoped germano-tellurite glass may be a potentially useful material for developing potential amplifiers and up-conversion optical devices.
authors.affiliation: College of Information Science and Engineering, Ningbo University, Ningbo 315211, China. gybetty@sohu.com
authors.forename: Yuan
authors.initials: Y
authors.lastname: Gao
authors.forename: Qiu-Hua
authors.initials: QH
authors.lastname: Nie
authors.forename: Tie-Feng
authors.initials: TF
authors.lastname: Xu
authors.forename: Xiang
authors.initials: X
authors.lastname: Shen
mesh_terms: D002414:Cations, Monovalent / Q000737:chemistry; D004871:Erbium / Q000737:chemistry*; D005857:Germanium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D008094:Lithium / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013691:Tellurium / Q000737:chemistry*; D013696:Temperature; D015018:Ytterbium / Q000737:chemistry*
chemical_list: D002414:Cations, Monovalent; D005857:Germanium; D004871:Erbium; D008094:Lithium; C026660:tellurous acid; D015018:Ytterbium; D013691:Tellurium