高性能YVO_(4)基稀土杂化发光材料的构建及其能量传递机制

Construction and energy transfer mechanism of high-performance YVO_(4)-based rare earth hybrid luminescent materials

采用溶剂热和离子交换两步实验法,以YVO_(4)为无机基质,2-噻吩甲酰三氟丙酮(TTA)为有机配体,构建了具有核壳结构的YVO_(4)∶Eu^(3+)@YVO_(4)∶Eu^(3+)-TTA稀土杂化发光材料,研究了其高效的发光性能和内部的能量传递机制。结果表明,在621nm的监控波长下,YVO_(4)∶Eu^(3+)@YVO_(4)∶Eu^(3+)-TTA稀土杂化发光材料在280~420nm范围内有两个很强的吸收峰(即V-O峰和TTA特征吸收峰)。YVO_(4)基质通过交换作用能量传递,而TTA有机配体通过分子内能量传递,可将吸收的紫外光能量有效地传递给Eu^(3+),从而实现了Eu^(3+)更高效的可见光(红光)发射。

Using YVO_(4)as the inorganic substrate and 2-Thiophenoyltrifluoroacetone(TTA)as the organic ligand,we constructed YVO_(4)∶Eu^(3+)@YVO_(4)∶Eu^(3+)-TTA rare earth hybrid luminescent materials with core-shell structure by solvothermal and ion-exchange experiments.The efficient luminescence performance and internal energy transfer mechanism were investigated.Experimental results showed that YVO_(4)∶Eu^(3+)@YVO_(4)∶Eu^(3+)-TTA rare earth hybrid luminescent materials had two strong absorption peaks(Namely,V-O peak and TTA characteristic absorption peak)in the range of 280~420nm at the monitoring wavelength of 621nm.YVO_(4)matrix transferred energy through exchange interactions,while TTA organic ligand transferred the absorbed ultraviolet energy to Eu^(3+)effectively through intramolecular energy transfer,thus achieving more efficient visible(red)light emission from Eu^(3+).