(1. 大连交通大学 辽宁省无机超细粉体制备及应用重点实验室，大连 116028；
2. 营口理工学院 材料科学与工程学院，营口 115014)
摘 要: 采用水热辅助固相法合成一系列Eu3+掺杂MgAl2O4: Eu3+荧光粉。主要考察粉体的物相结构、形貌、颗粒尺寸及电/磁偶极跃迁强度随Eu3+摩尔分数的变化规律。结果表明：当Eu3+不等价取代Mg2+后并未影响基质材料的晶体结构，产物全部为立方相MgAl2O4，但间隙O2-的存在会影响被取代离子Mg2+的配位关。当Eu3+掺入时，其会与溶液中的 共同参与调控样品的形貌和尺寸，以致片状颗粒的厚度减小、不规则程度加剧。基于J-O理论认为，在248 nm紫外和395 nm近紫外光激发下，Eu3+在MgAl2O4中所处格位的对称性差异是引起电偶极(5D0→7F2)和磁偶极(5D0→7F1)跃迁相对强度不同的主要原因。
关键字: MgAl2O4: Eu3+；格位对称性；电偶极跃迁；磁偶极跃迁
（1. Liaoning Key Laboratory for Fabrication and Application of Superfine Inorganic Powders, Dalian Jiaotong University, Dalian 116028, China;
2. Department of Chemical Engineering, Yingkou Institude of Technology, Yingkou 115014, China）
Abstract:A series of Eu3+ doped MgAl2O4: Eu3+ phosphors were synthesized by hydrothermal assisted solid phase method. The variation regularities of phase structure, morphology, particle size and electric/magnetic dipole transition intensity with Eu3+ contents were investigated. The results show that the crystal structure of matrix materials is not affected when Eu3+ replaces Mg2+ equivalently. All the products are cubic MgAl2O4, however, the existence of interstitial O2- ion will cause changes in the coordination relationship of the substituted ion Mg2+. In addition, when Eu3+ is incorporated, Eu3+ and will participate in the control of the morphology and size of the samples, resulting in a reduction in the thickness of the flake particles and aggravation of irregularities. Finally, based on J-O theory, it is believed that the difference of symmetry of Eu3+ in MgAl2O4 is the main reason for the difference of relative intensity of electric dipole (5D0→7F2) and magnetic dipole(5D0→7F1) under excitation of 248 nm UV and 395 nm near UV.
Key words: MgAl2O4: Eu3+; lattice symmetry; electric dipole transition; magnetic dipole transition
