Infrared emission properties of Dy3+-doped and Dy3+,Tm3+-codoped chalcohalide glasses

Series of 76GeS(2).19Ga(2)S(3).5AgCl (GGA) chalcohalide glasses doped with or codoped with Dy3+, Tm3+ were prepared in this work. Systematical detection of absorption and emission spectra in the near-infrared and mid-infrared region was conducted. For the Dy3+ sole-doped GGA chalcohalide glasses, mainly due to the relatively low efficiency of pumping absorption and poor radiative transition probabilities of mid-infrared emissions, the mid-infrared emissions were hardly to be detected. Through the codoping of Tm3+ with high concentration, several intrinsical processes including the enhancement of pumping absorptive efficiency at 808 nm, cross relaxation process of Tm3+: H-3(4) + E-3(6) -> F-3(4) + F-3(4) and energy transfer process of Tm3+:F-3(4) -> Dy3+:H-6(11/2) are carried out, therefore relatively strong mid-infrared emissions at about 2900 and 4300 nm have been clearly observed. (C) 2013 Elsevier B.V. All rights reserved