title: [Energy transfer and mid-infrared luminescence properties of Tm3+ /Dy3+ codoped chalcohalide glasses].
abstract: A series of chalcohalide glasses based on the composition 0.9 (Ge25 Ga5 S70)-0.1CsI doped with the different Tm3+ / Dy3+ ions ratio were synthesized by melt-quenching technique. The absorption spectra, and mid-infrared fluorescence of different glass samples under 800 nm laser excitation were measured. The results prove that, Tm3+ is an efficient sensitizer, which can enhance the Dy3+ : 2.9 microm fluorescence intensity significantly. A decrease in the intensity of 1.8 microm fluorescence and lifetimes of the Tm3+ : (3)F4 level occurred with increasing the concentration of Dy3+ ions from 0 to 1 Wt% where Tm3+ concentration was fixed to 0.5 Wt%. Also a wide spectral overlap between Tm+ : 1.8 microm emission and the absorption of Dy3+ : 6 H(15/2) --> (6)H(11/2) showed that the effective energy transfer between the two rare-earth ions was mainly attributed to the resonance energy from Tm3+: (3)F4 to Dy(3)+ : (6)H(11/2) level.
authors.affiliation: College of Information Science and Engineering, Ningbo University, Ningbo 315211, China. jasonzpj@163.com
authors.forename: Peng-jun
authors.initials: PJ
authors.lastname: Zhang
authors.forename: Shi-xun
authors.initials: SX
authors.lastname: Dai
authors.forename: Ying
authors.initials: Y
authors.lastname: Cao
authors.forename: Bo
authors.initials: B
authors.lastname: Peng
authors.forename: Tie-feng
authors.initials: TF
authors.lastname: Xu
authors.forename: Qiu-hua
authors.initials: QH
authors.lastname: Nie
authors.forename: Xiang-hua
authors.initials: XH
authors.lastname: Zhang