title: Host dependence of spectroscopic properties of Dy 3+ - doped and Dy 3+, Tm 3+ -codped Ge-Ga-S-CdI 2 chalcohalide glasses.
abstract: Two serial Dy(3+)-doped and Dy(3+), Tm(3+)-codoped (100-x)(0.8GeS(2).0.2Ga(2)S(3)).xCdI(2) (0<or=x<or=20) chalcohalide glasses were prepared and characterized. By analyzing the absorption and emission measurements of the two serial chalcohalide glasses with the Judd-Ofelt analysis, we were able to calculate its Judd-Ofelt strength parameters Omega t (t = 2, 4, 6), transition probabilities, exited state lifetimes, branching ratios, and emission cross-sections. In the Dy(3+)-doped glasses, increase of CdI(2) had positive effect up to 1330 nm fluorescence and the emission cross section (sigma emi) was estimated to be 4.19 x 10(-20)cm(2) for the 0.2 wt% Dy(3+)-doped 64 GeS(2).16 Ga(2)S(3).20 CdI(2) glass. In the Dy(3+), Tm(3+)-codoped glasses, increase of CdI(2) diminished the amount of ethane-like units [S(3)(Ga)Ge-Ge(Ga)S(3)], improved the Tm(3+): 3F 4-->Dy(3+): 6H 11/2 energy transfer efficiency and intensified the mid-infrared emissions. The emission cross sections (sigma emi) of the 2900 and 4300 nm fluorescences were estimated to be 1.68 x 10(-20) and 1.20 x 10(-20)cm(2) respectively for the 0.2 wt% Dy(3+) and 0.5 wt% Tm(3+) codoped 64 GeS(2).16 Ga(2)S(3).20 CdI(2) glass. These novel chalcohalide glasses are promising candidate materials for fiber-amplifiers and mid-infrared laser devices.
authors.affiliation: State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and precision Mechanics, Chinese Academy of Science (CAS), Xi'an, Shanxi 710119, PR China.
authors.forename: Haitao
authors.initials: H
authors.lastname: Guo
authors.forename: Lei
authors.initials: L
authors.lastname: Liu
authors.forename: Yongqian
authors.initials: Y
authors.lastname: Wang
authors.forename: Chaoqi
authors.initials: C
authors.lastname: Hou
authors.forename: Weinan
authors.initials: W
authors.lastname: Li
authors.forename: Min
authors.initials: M
authors.lastname: Lu
authors.forename: Kuaisheng
authors.initials: K
authors.lastname: Zou
authors.forename: Bo
authors.initials: B
authors.lastname: Peng
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry; D004419:Dysprosium / Q000737:chemistry*; D005708:Gallium / Q000737:chemistry; D005857:Germanium / Q000737:chemistry; D005898:Glass; D006219:Halogens / Q000737:chemistry*; D007454:Iodides / Q000737:chemistry; D049449:Luminescence; D055095:Optics and Photonics; D013050:Spectrometry, Fluorescence / Q000379:methods; D013053:Spectrophotometry / Q000379:methods*; D013055:Spectrophotometry, Infrared / Q000379:methods; D013056:Spectrophotometry, Ultraviolet; D013455:Sulfur / Q000737:chemistry; D013691:Tellurium / Q000737:chemistry; D013932:Thulium / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D006219:Halogens; D007454:Iodides; D005857:Germanium; D004419:Dysprosium; C073250:cadmium iodide; D013455:Sulfur; D013932:Thulium; D005708:Gallium; C026660:tellurous acid; D013691:Tellurium