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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This work has been supported by the National High Technology Research and Development Program of China (No.2013AA014201), the Natural Science Foundation of Tianjin (Nos.11JCYBJC00300, 14JCZDJC31200, 15JCYBJC16700 and 15JCYBJC16800), the National Key Foundation for Exploring Scientific Instrument of China (No.2014YQ120351), and International Cooperation Program from Science and Technology of Tianjin (No.14RCGHGX00872).