Structure and red emissions of Eu³⁺-doped hydrocalumite prepared in ethanol/water media

Kunlei Zhang¹，Yufeng Chen¹，Xiaoqing Wang¹，Li Wang²

1. College of Chemistry, Nanchang University2. College of Materials Science and Engineering, Nanchang University

摘 要：Eu³⁺-doped hydrocalumites (Eu³⁺-doped CaAl-LDH) were prepared in an ethanol/water media. Various techniques, including inductively coupled plasma atomic emission spectroscopy （ICP-AES）, X-ray diffraction （XRD）, and fluorescent spetctra （FL）, etc., were employed to study the structure, composition,and fluorescence of samples. Compositional analyses reveal that the contents of all the elements calculated from the chemical formula are close to that of the actual found from measurement. XRD results suggest that the samples with different molar ratios of Ca²⁺/(Al³⁺+Eu³⁺) present typical layered structure. Moreover, all the samples exhibit monoclinic structure. Fluorescent spectra show strong red emissions ascribed to⁵D₀→⁷F_J（J=1, 2） transitions of Eu3+ions for all the Eu³⁺-doped hydrocalumites,revealing that the hydrocalumite is favorable for the emission of Eu³⁺. The Eu³⁺-doped hydrocalumite may be a latent fluorescent material applied in biological or medical fields in consideration of the biocompatibility of Ca²⁺ ions and fluorescent property of Eu³⁺ ions.

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