中文摘要：

测量了不同浓度Li＋共掺杂下GdTaO4∶Eu3＋荧光粉材料的X射线衍射谱（XRD）、发射光谱以及红外透射谱,并应用Judd-Ofelt理论,由发射光谱得到Eu3＋的光谱跃迁强度参数Ω2。发现Li＋共掺杂有助于提高GdTaO4∶Eu3＋的发光强度,当x=0.06和0.10时,612 nm处的发光强度分别被提升了1.7倍和1.5倍。发光增加的原因是因为Li＋的助熔剂效应有效提高了GdTaO4材料的结晶性能,并抑制了Gd2O3和Ta2O5杂相的产生,而非所推测的掺Li＋引起了配位场对称性降低,从而导致宇称禁戒的放宽。此时Gd0.92-xLixTaO4∶Eu30.＋08材料不仅结晶性能较好,而且Gd2O3和Ta2O5杂相也相对较少,故而发光增强最为明显。

英文摘要：

The XRD,emission and IR transmission spectra of Li-doped GdTaO4∶Eu3＋ phosphors were measured.Judd-Ofelt theory was applied,and the intensity parameters Ω2 of Eu3＋ for optical transition were calculated.The results show that Li＋ codoping can enhance the luminescence intensity of GdTaO4∶Eu3＋.The intensity can be improved up to 1.7 and 1.5 times,respectively,when x=0.06 and 0.10.The phenomenon results not from the assumption that Li＋ codopant can reduce the crystal symmetry of GdTaO4∶Eu3＋ so as to relax the parity forbidden transition,but from the flux effect of Li＋ codopant which can improve the crystallinity of GdTaO4∶Eu3＋ and suppress the Gd2O3 and Ta2O5 hetero phases.Gd0.92-xLixTaO4∶Eu3＋0.08 has not only quite a good crystallinity but also less Gd2O3 and Ta2O5 hetero phases when x=0.06 or 0.10.Therefore,their luminescence intensities can be improved evidently.