Hydrothermal synthesis and tunable luminescence of persimmon-like sodium lanthanum tungstate:Tb³⁺, Eu³⁺ hierarchical microarchitectures
2013
Tian, Yue | Chen, Baojiu | Tian, Bining | Yu, Naisen | Sun, Jiashi | Li, Xiangping | Zhang, Jinsu | Cheng, Lihong | Zhong, Haiyang | Meng, Qingyu | Hua, Ruinian
Persimmon-like NaLa(WO₄)₂ microarchitectures were prepared via hydrothermal process with using trisodium citrate (Na₃Cit) as chelated reagent and characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), photoluminescence (PL), and fluorescent dynamics. The influences of Na₃Cit concentration, organic additivities, and reaction time on the morphologies of NaLa(WO₄)₂ phosphor were studied. The results revealed that Na₃Cit species had double functions of strong ligand and structure-directing reagent that could efficiently control the formation of persimmon-like NaLa(WO₄)₂ microarchitectures. The possible mechanism for the growth of persimmon-like NaLa(WO₄)₂ microarchitectures was attributed to the Ostwald ripening mechanism. The energy transfer from Tb³⁺ to Eu³⁺ in the persimmon-like NaLa(WO₄)₂ phosphors was observed. The energy transfer efficiencies and emission colors can be tuned by changing the concentration of Eu³⁺. Finally, it was deduced that the electric dipole–dipole interaction (D–D) is the main mechanism for energy transfer between Tb³⁺ and Eu³⁺ in the persimmon-like NaLa(WO₄)₂ phosphor.
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