Preparetion Of Eu³⁺ Doped Terbium Oxyacid Compounds And Their Luminous Properties

Among various luminescent materials, lanthanide-doped materials have attracted wide attention in recent years, owing to their outstanding luminescent properties as well as wide applications. Lanthanide-doped luminous materials are widely used in lighting, display devices, photoelectric switching, biological imaging（tag）, and some other fields due to their outanding performances, such as chemical（thermal） stabilization, strong light absorption, narrow-line emission, high luminous efficiency, high monochromaticity, low photobleaching, and long lifetimes, etc. Generally, material’s microstructure with superior dispersion, uniform size distribution, and regular shape is greatly beneficial to its performaces’ stability. Manwhile, different microstructures has different influences on materials’ performances. Therefore, to develope new application fields of the materials and design novel materials in accordance with our wishes, it is of great significance to develope novel preparation method for functional materials, explore the microstructure’s growth mechanism, and investigate the relationship between performances and microstructures intensively. Among various preparation methods for inorganic materials, ‘wet’ chemistry is of particular attractive in the past decades.In this paper, the ‘wet’ chemistry preparation route was utilized to prepare several materials with controllable morphologies, and their formation mechanisms were put forward based on a few controllable experiments. We had mainly investigated the influences of doped Eu³⁺ ions on matrix materials’ phases and morphologies. Particularly, the fluorescence resonance energy transfer（FRET） process, resulting in the tunable luminescent properties in Tb₂（CO₃）₃:Eu³⁺, Tb₂（WO₄）₃:Eu³⁺, and Tb₂（MoO₄）₃:Eu³⁺, had been investigated in depth. The research content is consisted of two parts, firstly, milticolor phosphors of Tb₂（CO₃）₃:Eu³⁺, Tb₂（WO₄）₃:Eu³⁺, and Tb₂（MoO₄）₃:Eu³⁺ were prepared by ‘wet’ chemistry route. Since the microstructure had a great influence on material’s properties, the formation mechanism of different microstructures were investigated in detail so as to make us realize the nature of the crystal growth. Secondly, we had also investigated their luminescent properties intensively, finding that the energy in a donor Tb³⁺ could be efficiently transferred to an activator Eu³⁺ owing to the fluorescence resonance energy transfer process which resulted in the tunable emission colors in the obtained three materials. Based on the intensive exploration of FRET process, we had a deeper understanding of the luminescence phenomenon.