title: Quantitative Analysis of Energy Transfer and Origin of Quenching in Er(3+)/Ho(3+) Codoped Germanosilicate Glasses.
abstract: The energy transfer mechanism between Ho(3+) and Er(3+) ions has been investigated in germanosilicate glass excited by 980 nm laser diode. A rate equation model was developed to demonstrate the energy transfer from Er(3+) to Ho(3+) ions, quantitatively. Energy transfer efficiency from the Er(3+):(4)I13/2 to the Ho(3+):(5)I7 level can reach as high as 75%. Such a high efficiency was attributed to the excellent matching of the host phonon energy with the energy gap between Er(3+):(4)I13/2 and Ho(3+):(5)I7 levels. In addition, the energy transfer microparameter (CDA) from Er(3+):(4)I13/2 to Ho(3+):(5)I7 level was estimated to (4.16 ± 0.03) × 10(-40) cm(6)·s(-1) via the host-assisted spectral overlap function, coinciding with the CDA (2,88 ± 0.04) × 10(-40) cm(6)·s(-1) from decay analysis of the Er(3+):(4)I13/2 level which also indicated hopping migration-assisted energy transfer. Furthermore, the concentration quenching of Ho(3+):(5)I7 → (5)I8 transition was the dipole-dipole interaction in the diffusion-limited regime, and the quenching concentration of Ho(3+) reached 4.13 × 10(20) cm(-3).
authors.forename: Tao
authors.initials: T
authors.lastname: Wei
authors.forename: Ying
authors.initials: Y
authors.lastname: Tian
authors.affiliation: ‡College of Mathematics, Physics and Information Engineering, Zhejiang Normal University, Jinhua, Zhejiang 321004, People's Republic of China.
authors.forename: Cong
authors.initials: C
authors.lastname: Tian
authors.forename: Muzhi
authors.initials: M
authors.lastname: Cai
authors.forename: Xufeng
authors.initials: X
authors.lastname: Jing
authors.forename: Bingpeng
authors.initials: B
authors.lastname: Li
authors.forename: Rong
authors.initials: R
authors.lastname: Chen
authors.forename: Junjie
authors.initials: J
authors.lastname: Zhang
authors.forename: Shiqing
authors.initials: S
authors.lastname: Xu
mesh_terms: D002412:Cations / Q000737:chemistry; D004871:Erbium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D006695:Holmium / Q000737:chemistry*; D007834:Lasers; D008956:Models, Chemical; D060739:Phonons; D055668:Photochemical Processes; D017640:Silicates / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D019265:Spectroscopy, Near-Infrared
chemical_list: D002412:Cations; D017640:Silicates; D004871:Erbium; D006695:Holmium