(1. 大連交通大學 遼寧省無機超細粉體制備及應用重點實驗室，大連 116028；
2. 營口理工學院 材料科學與工程學院，營口 115014)
摘 要: 采用水熱輔助固相法合成一系列Eu3+摻雜MgAl2O4: Eu3+熒光粉。主要考察粉體的物相結構、形貌、顆粒尺寸及電/磁偶極躍遷強度隨Eu3+摩爾分數(shù)的變化規(guī)律。結果表明：當Eu3+不等價取代Mg2+后并未影響基質材料的晶體結構，產(chǎn)物全部為立方相MgAl2O4，但間隙O2-的存在會影響被取代離子Mg2+的配位關。當Eu3+摻入時，其會與溶液中的 共同參與調控樣品的形貌和尺寸，以致片狀顆粒的厚度減小、不規(guī)則程度加劇。基于J-O理論認為，在248 nm紫外和395 nm近紫外光激發(fā)下，Eu3+在MgAl2O4中所處格位的對稱性差異是引起電偶極(5D0→7F2)和磁偶極(5D0→7F1)躍遷相對強度不同的主要原因。
關鍵字: MgAl2O4: Eu3+；格位對稱性；電偶極躍遷；磁偶極躍遷
（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
