Nd³⁺ doped fluorochlorozirconate glass: 3.9 μm MIR emission properties and energy transfer

Abstract

The Nd³⁺ doped fluorochlorozirconate (FCZ) glass was prepared by melt-quenching method. The 3.9 μm emission from Nd³⁺ ions is attributed to the two-photon absorption process. The strong emission transition at 3.9 μm fluorescence peak intensity, corresponding to the ⁴G_11/2→²K_13/2 transition, is directly proportional to the NaCl concentration. With the increase of the Cl^- ions amount, the mid-infrared (MIR) luminescent intensity is significantly enhanced. Additionally, the Judd-Ofelt (J-O) parameter Ω₂ is larger than that of the fluorozirconate (FZ) glass, which indicates the covalency of the bond between RE ions and ligand is stronger as Cl- ions substitution of F^- ions in chloride FZ glass. The X-ray diffraction (XRD) patterns show that the amorphous glassy state keeps the FZ glass network structure. In brief, the advantageous spectroscopic characteristics make the Nd³⁺-doped FCZ glass be a promising candidate for application of 3.9 μm emission.

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