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以2,2′∶6′,2″-三联吡啶(L1)为基础,通过引入不同的空穴传输基团合成了4′-咔唑基-2,2′∶6′,2″-三联吡啶(L2),4′-二苯基胺基-2,2′∶6′,2″-三联吡啶(L3),4′-二(4-叔丁基苯基)胺基-2,2′∶6′,2″-三联吡啶(L4),4′-(N-苯基-1-萘基)胺基-2,2′∶6′,2″-三联吡啶(L5),4′-(N-苯基-2-萘基)胺基-2,2′∶6′,2″-三联吡啶(L6)5个N,N,N-三齿中性配体,然后以三氟乙酰噻吩丙酮(HTTA)作为第一配体合成了6种铕配合物。在369~373 nm激发条件下,配合物都表现出铕离子5D0-7FJ(J=0,1,2,3,4)的特征发射。引入不同的空穴传输基团后,在铕离子的周围形成了“光吸收天线”(light-harvesting antenna),不仅扩大了配合物吸收光能的范围、增强了配合物的吸收强度,而且提高了配合物的光致发光性能。其中含有咔唑基团的配合物具有最强的发光强度和最长的激发态寿命。
Based on the 2,2 ’: 6’, 2 “-terminated pyridine (L1), 4’-carbazolyl-2,2’6 ’, 2” Pyridine (L2), 4’-diphenylamino-2,2’6 ’, 2 “-terpyridine (L3), 4’-bis Bipyridine (L4), 4 ’- (N-phenyl-1-naphthyl) amino-2,2’6’, 2 ” Five N, N, N tridentate neutral ligands were synthesized from 5 (N-phenyl-2-naphthyl) amino-2,2’6 ’, 2’ ’- terpyridine (L6) Acetylated thiophene acetone (HTTA) as the first ligand synthesized six Europium complexes. Under the excitation conditions of 369 ~ 373 nm, the complexes all showed the characteristic emission of europium ion 5D0-7FJ (J = 0,1,2,3,4). The introduction of different hole-transporting groups led to the formation of a light-harvesting antenna around the europium ion, which not only enlarged the range of light energy absorbed by the complex and enhanced the absorption intensity of the complex, But also improve the photoluminescence of the complex. Among them, the carbazole group-containing complexes have the strongest luminescence intensity and the longest excited state lifetime.