Mid-Infrared 2.86- $\mu \text{m}$ Emission Characteristics in Highly Dy3+ Doped Fluoroaluminate Glass

A highly Dy
³⁺
doped (10 mol%) fluoroaluminate glass was successfully fabricated by melt-quenching method for the first time. The intensity of 2.86-μm emission increases with the Dy
³⁺
ions concentration without fluorescence quenching because of the large dispersibility of Dy
³⁺
ions in this glass network without clustering. Radiative and emission parameters were calculated based on the Judd-Ofelt theory, which show that the 10 mol% highly doped sample possesses a high calculated spontaneous transition probability (32.01 S
^-1
) together with a large emission cross section (5.94 × 10
^-21
cm
²
) of Dy
³⁺
:
⁶
H
_13/2
→
⁶
H
_15/2
transition. In addition, the increasing Q
_t
(t = 2,4,6) values, which caused by a complex outermost electron configuration of Dy
³⁺
ions, have been further discussed to analyze the partial glass structure.