中文摘要：

采用高温固相法制备了新型红色荧光粉Na La1–xMgTeO6：xEu3＋,通过X射线衍射和场发射扫描电镜对粉体的结构和形貌进行了表征,测量了粉体在298~473 K温度范围的发射光谱、激发光谱,计算出能量传递的临界距离、热激活能及色品坐标值。结果表明：该粉体能被397 nm近紫外光和466 nm蓝光有效激发,并发射出Eu3＋的5D0→7F2跃迁产生的617 nm红光;Eu3＋的最佳掺杂量为40%（摩尔分数）,浓度猝灭机理为电偶极–电偶极相互作用;NaLaMgTeO6：Eu3＋在150℃时积分发光强度是室温的80.7%,发光热稳定性良好,发光效率高,是一种潜在高效的LED用红色荧光粉材料。

英文摘要：

A series of red-emitting phosphors of NaLaMgTeO6：Eu3＋ were prepared via the conventional solid-state reaction. The structure and morphology were investigated by X-ray diffraction and field emission scanning electron microscopy. The excitation and emission spectra were measured at 298-473 K, and the critical distance for energy transfer, thermal activation energy and CIE chromaticity coordinate were determined. The results indicate that, the phosphors emit an intense red light under the excitation at 397 nm or 466 nm, corresponding to the 5D0→ 7F2 transition of Eu3＋. The optimal Eu3＋ amount is 40% （in mole fraction）, and the concentration quenching is ascribed to the dipole-dipole interaction. Moreover, the photoluminescence exhibits a favorable thermal stability and a high efficiency. In conclusion, NaLaMgTeO6：Eu3＋ phosphor is a promising material for LED applications.