title: Enhanced 2-5 μm emission in Ho³⁺/Yb³⁺ codoped halide modified transparent tellurite glasses.
abstract: Ho(3+)/Yb(3+) codoped TeO₂-WO₃-ZnO-ZnX₂(X=F, Cl) glasses were prepared by melt-quenching method. The absorption spectra, transmittance spectra, X-ray diffraction (XRD) curves, Raman spectra and mid-infrared fluorescence spectra were measured, along with the Judd-Ofelt intensity parameters, stimulated emission and absorption cross-sections were calculated to evaluate the effects of halide amount of the spectroscopic properties. It is shown that the introduction of an appropriate amount of halide can further improve the mid-infrared fluorescence intensity through an enhanced phonon-assisted energy transfer between Ho(3+)/Yb(3+) ions and the energy transfer mechanisms are investigated quantitatively in detail by calculating energy transfer microparameters and phonon contribution ratios. The results indicate that this kind of glasses is a promising material for mid-infrared optical fiber.
authors.affiliation: School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
authors.forename: Wenjun
authors.initials: W
authors.lastname: Zhang
authors.affiliation: School of Materials Science and Engineering, Tongji University, Shanghai 201804, China. Electronic address: lin_jian@tongji.edu.cn.
authors.forename: Jian
authors.initials: J
authors.lastname: Lin
authors.affiliation: School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
authors.forename: Yujie
authors.initials: Y
authors.lastname: Jia
authors.affiliation: School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
authors.forename: Shuo
authors.initials: S
authors.lastname: Zhang
authors.affiliation: School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
authors.forename: Junhong
authors.initials: J
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
authors.forename: Guangyao
authors.initials: G
authors.lastname: Sun
authors.affiliation: School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
authors.forename: Song
authors.initials: S
authors.lastname: Ye
authors.affiliation: No. 23 Research Institute of China Electronic Technology Corporation Group, Shanghai 200437, China.
authors.forename: Junjiang
authors.initials: J
authors.lastname: Ren
authors.affiliation: No. 23 Research Institute of China Electronic Technology Corporation Group, Shanghai 200437, China.
authors.forename: Liang
authors.initials: L
authors.lastname: Rong
mesh_terms: D004735:Energy Transfer; D005453:Fluorescence; D005898:Glass / Q000737:chemistry*; D054879:Halogenation; D006695:Holmium / Q000737:chemistry*; D013691:Tellurium / Q000737:chemistry*; D014961:X-Ray Diffraction; D015018:Ytterbium / Q000737:chemistry*
chemical_list: C026660:tellurous acid; D015018:Ytterbium; D013691:Tellurium; D006695:Holmium
keywords: 2–5μm; Energy transfer; Ho(3+)/Yb(3+); Judd–Ofelt; Oxyhalide tellurite glass