title: Energy Transfer and 1.8 µm Emission in Tm³⁺/Yb³⁺ Co-Doped LiYF₄Crystal.
abstract: LiYF₄ single crystals co-doped with various Tm³⁺/Yb³⁺ concentrations were grown using the Bridg- man method. The luminescent properties of the crystals were investigated through emission spectra, emission cross section, and decay curves under excitation by 980 nm. Compared with the Tm³⁺ single-doped LiYF₄ crystal, an enhanced emission band from 1600 to 2150 nm was observed upon excitation of a 980 nm laser diode. The energy transfer from Yb³⁺ to Tm³⁺ and the optimum fluo- rescence emission around 1.80 µm of Tm³⁺ ion were investigated. The maximum emission cross section at 1.8 µm was calculated to be 1.48 x 10⁻²⁰ cm² according to the measured absorption spectrum. The high energy transfer efficiency of 86.5% from Yb³⁺ to Tm³⁺ ion demonstrate that the Yb³⁺ ions can efficiently sensitize the Tm³⁺ ions.
authors.forename: Shuo
authors.initials: S
authors.lastname: Yang
authors.forename: Haiping
authors.initials: H
authors.lastname: Xia
authors.forename: Jiazhong
authors.initials: J
authors.lastname: Zhang
authors.forename: Yongzhang
authors.initials: Y
authors.lastname: Jiang
authors.forename: Xuemei
authors.initials: X
authors.lastname: Gu
authors.forename: Jianli
authors.initials: J
authors.lastname: Zhang
authors.forename: Dongjie
authors.initials: D
authors.lastname: Wang
authors.forename: Haochuan
authors.initials: H
authors.lastname: Jiang
authors.forename: Baojiu
authors.initials: B
authors.lastname: Chen