Kido J, Nagai K, Okamoto Y. Organic electroluminescent devices using lanthanide complexes [J]. J. Alloys Compd., 1993, 192 (1-2):30-33.[2] Pope M, Kallmann H P, Magnante P. Electroluminescence in organic crystal [J]. J. Chem. Phys., 1963, 38 (8):2042-2043.[3] Li W L, Yu J Q. Organic electroluminescent devices using terbium chelates as the emitting layers [J]. Synth. Met., 1997, 91 (1-3):263-265.[4] Tian Wenjing, Wu Fang, Fan Yuguo, et al. Energy band structure of organic/polymer materials and its applications in electroluminescent devices [J]. Chin. J. Lumin. (发光学报), 2000, 21 (3):230-237 (in Chinese).[5] Ding Bangdong, Zhang Jimei, Zhu Wenqing, et al. Convenient electrochemical method to determine the energy level of organic electroluminescent materials [J]. Chin. J. Lumin. (发光学报), 2003, 24 (6):606-611 (in Chinese).[6] Yu G, Liu Y Q, Wu X, et al. Soluble europium complexes for light-emitting diodes [J]. Chem. Mater., 2000, 12 (9):2537-2541.[7] Gao Xin, Deng Zhenbo, Tao Dongliang, et al. Luminescence properties of a new kind of rare earth complexes [J]. J. Chin. Rare Earth Soc. (中国稀土学报), 2001, 19 (6):536-539 (in Chinese).[8] Fu Y J, Wong T K S, Yan Y K, et al. Synthesis, characterization and luminescent properties of a europium(Ⅲ) complex [J]. Thin Solid Films, 2002, 417 (1-2):78-84.[9] Li Wenxian, Zhang Raiping, Guo Lei, et al. Synthesis of phenylacetic acid rare earth complexes at low temperature solid state reaction and luminescence property of Eu3+ complexes [J]. Chin. J. Lumin. (发光学报), 2007, 28 (2):207-213(in Chinese).[10] Xu Lijuan, Wang Ruifen, Zhao Na, et al. Synthesis and properties of ternary terbium complexes with halogen-benzoic acid and 1, 10-phenanthroline [J]. Chin. J. Lumin. (发光学报), 2007, 28 (5):781-787 (in Chinese).