Double-perovskite compound Na2ZrTeO6: synthesis, structure and self-activated near-infrared luminescence
【Abstract】
The high-purity double-perovskite Na2ZrTeO6 samples were synthesized by wet chemical method.
Structure analysis indicate that Na2ZrTeO6 belongs to the typical rock-salt-type perovskite structure.
Na2ZrTeO6 exhibits self-activated near-infrared emission centered at 780 nm excited by 308 nm.
The sample's emission intensity maintained 64% of its room temperature peak intensity at 200 °C.
Perovskite compounds are always the focus in the material research field. Herein, the polycrystalline samples and single crystals of Na2ZrTeO6, a B-site ordered double-perovskite compound, were prepared successfully. Single crystal X-ray diffraction demonstrated that Na2ZrTeO6 crystallizes in the cubic space group Fm-3m (No. 225) with unit parameters of a = b = c = 7.80360(10) Å. The crystal structure of Na2ZrTeO6, formed by ZrO6 and TeO6 octahedra through sharing the corner oxygen atoms, belongs to the typical rock-salt-type perovskite structure. The density functional theory calculations show that Na2ZrTeO6 has a direct band gap with band gap of 3.21 eV, which is lower than the experimental value of 3.85 eV. Interestingly, the powder samples of Na2ZrTeO6 exhibit a self-activated near-infrared emission centered at 780 nm under ultraviolet light excitation. And a strong luminescence thermal stability was also observed. Compared to room temperature, the luminescence intensity can maintain 64% at 200 °C.
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【Author】
Dexiang Huang,Pan Zhao,Zehua Wang,Limei Song,Yanping Jin,Jianhua Gao
【Journal】
Solid State Sciences(IF：2.2) Time：2024-04-27
