中文摘要：

采用高温固相法,通过控制反应温度和Eu3＋掺杂量,制备Ba Al2O4：Eu直接白色荧光粉。以电荷补偿模型为基础讨论了自还原机理。当合成温度为1 200℃、Eu3＋掺杂量为12%（摩尔分数）时,荧光粉颜色趋近于白光,色坐标位于（0.36,0.38）。通过X射线光电子能谱、发射和激发光谱以及漫反射光谱,研究了Ba Al2O4：Eu荧光粉的发光性能。结果表明：荧光粉中存在2个发光中心,分别与Ba的2种格位相对应。Eu2＋和Eu3＋共存于基质中,说明Eu3＋在空气中发生自还原反应。主峰位于500 nm处的发射宽谱符合Eu2＋的4f 65d–4f 7跃迁,596、619、655以及709 nm处的发射峰分别对应Eu3＋的4f–4f中5d0–7fJ（J=1,2,3,4）特征发射跃迁,发射峰以619 nm处的5d0–7f2电偶极跃迁为主。

英文摘要：

BaAl2O4：Eu direct white light phosphors were synthesized with BaAl2O4 by a high-temperature solid state method. The mechanism of self-reduction was analyzed based on the charge compensation model. The luminescence properties of BaAl2O4： Eu phosphors were investigated. The results show that when the synthesis temperature is 1 200 ℃ and the doping concentration of Eu3＋ is 12% （in mole fraction）, the color of prepared phosphor becomes white with the International Commission on Illumination（CIE） coordinates （0.36, 0.38）. There are two luminescence centers in the host, which corresponds to the two types of barium sites. The self-reduction occurs in air in BaAl2O4, leading to the coexistance of Eu2＋ and Eu3＋. The band emission peak at 500 nm is assigned to 4f 65d-4f 7 transition of Eu2＋, and another four emissions peaks at 596, 619, 655 and 704 nm are attributed to 4f-4f transitions of 5d0-7fj（J = 1, 2, 3 and 4） of Eu3＋. The main emission of BaAl2O4：Eu is located at 619 nm due to the electric dipole transition of 5d0-7f2 of Eu3＋. The prepared BaAl2O4：Eu phosphors can be regarded as an alternative approach to obtain direct white emission with the proper wavelengths of UV irradiation.