基于氟代苯并咪唑配体的绿光铱配合物的合成与表征

Synthesis and Characterization of a Green-Emitting Iridium Complex Based on Fluorinated Benzoimidazole Ligand

基于一种氟代的配体2-(4'-氟苯基)-1-苯基-苯并咪唑,在高温(>200℃)条件下直接合成了经式绿光铱配合物mer-Ir(FPBI)3,并通过1H NMR和单晶X射线衍射分析确定了其经式构型。不同于以前报道的具有经式构型的铱配合物(<0.1),mer-Ir(FPBI)3在甲苯溶液中的光致发光量子效率高达0.46。应用该配合物制备了高效磷光有机电致发光器件,最大电流效率和外量子效率分别为38.5 cd/A和11.8%,色坐标为(0.29,0.58)。

On the basis of a fluorinated ligand, namely 2-（ 4＇-fluorophenyl ）-1-phenyl-benzoimidazole, a green-emitting iridium complex mer-Ir（FPBI） 3 with meridional configuration has been successfully synthesized under a temperature higher than 200 ~C, which is confirmed by both 1H NMR and single crystal X-ray diffraction analysis. Different from previously-reported meridional iridium complexes （ 〈 0. 1 ） , noticeably, mer-Ir（ FPBI ）3 shows a photoluminescent quantum yield as high as 0. ,$6. Therefore, highly efficient phosphorescent organic light-emitting diodes （PhOLEDs） are realized by tuning the doping concentration of mer-Ir（ FPBI ）3 into 4, 4＇-N, N＇-diearbazolebiphenyl （CBP）, revealing a maximum current efficiency of 38.5 ed/A（11. 8% ） with the corresponding Commission Internationale de L＇Eelairage（CIE） coordinates of （0.29, 0.58）.