Three cationic iridium(III) complexes with 1,10-phenanthroline or compounds containing 1,10-phenanthroline unit as auxiliary ligands: Synthesis and application in polymer light-emitting diodes
Three cationic iridium(III) complexes with 1,10-phenanthroline or compounds containing 1,10-phenanthroline unit as auxiliary ligands: Synthesis and application in polymer light-emitting diodes
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DOI：
10.1016/j.dyepig.2016.04.029
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发表时间：
2016-08
影响因子：
4.5
通讯作者：
Huaijun Tang;Zeyu Chen;Liying Wei;Jingsheng Miao;Guoyun Meng;Yonghui He;Hongbin Wu
中科院分区：
文献类型：
--
作者：
Huaijun Tang;Zeyu Chen;Liying Wei;Jingsheng Miao;Guoyun Meng;Yonghui He;Hongbin Wu
合成了三种黄绿色的阳离子Ir(Ⅲ)配合物[(Cbt)2Ir(Phen)]Pf6，[(CBT)2Ir(BCP)]PF6and[(CBT)2Ir(o-phen)]PF6were(phen：1，10-邻菲咯啉，bcp：偏铜精氨酸，o-phen：2-(4-tert-butylphenyl)-5-(4-(1-ethyl-H-imidazo[4，5-f][1，10]phenanthrolin-2-yl)phenyl)-1，3，4-oxadiazole，Cbt：2-(9-(2-ethylhexyl)-9H-carbazol-3-yl)benzo[d]thiazole).它们都成功地应用于聚合物发光二极管：ITO/PEDOT：PSS(40 Nm)/PVK：PBD：Complex(质量比100：40：X，x=1.0，3.0和5.0)(80 Nm)/CSF(1.5 nm)/Al(100 Nm)。最大亮度分别为8733cd/−2、8878/cd/−2和13019/cd/a−2，最大亮度效率分别为13.7%/cd/A−1、12.5%/cd/A−1和17.5%/cd/A−1。由于两个甲基的空间位阻增加了中心Ir3+与BCP之间的距离，而且BCP中1，10-邻菲咯啉单元的共轭平面被两个苯环扭曲，电子流动受到部分阻碍，[(CBT)2Ir(BCP)]PF6的电致发光性能最差。由于电子传递官能团2，5-二苯基-1，3，4-恶二唑和空穴传递官能团咔唑具有良好的双极性能，[(CBT)2Ir(o-phen)]PF6具有最好的电致发光性能。
Three yellow-green phosphorescent cationic iridium(III) complexes[(CBT)2Ir(phen)]PF6,[(CBT)2Ir(BCP)]PF6and[(CBT)2Ir(o-phen)]PF6were synthesized (phen: 1,10-phenanthroline,BCP: bathocuproine,o-phen: 2-(4-tert-butylphenyl)-5-(4-(1-ethyl-H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)phenyl)-1,3,4-oxadiazole,CBT: 2-(9-(2-ethylhexyl)-9H-carbazol-3-yl)benzo[d]thiazole). All of them were successfully applied in polymer light-emitting diodes: ITO/PEDOT: PSS (40 nm)/PVK: PBD: complex (mass ratios 100: 40:x,x= 1.0, 3.0, and 5.0) (80 nm)/CsF (1.5 nm)/Al (100 nm). The maximum luminances were 8733 cd m−2, 8878 cd m−2and 13019 cd m−2, the maximum luminance efficiencies were 13.7 cd A−1, 12.5 cd A−1and 17.5 cd A−1respectively. Because the steric hindrance of two methyls increase the distance between central Ir3+andBCP,and the conjugated plane of 1,10-phenanthroline unit inBCPare distorted by two benzene rings, the flow of electrons are partly hindered,[(CBT)2Ir(BCP)]PF6exhibits the lowest electroluminescent performances. Due to the electron-transporting functional group 2,5-diphenyl-1,3,4-oxadiazole and hole-transporting functional group carbazole providing good bipolar property,[(CBT)2Ir(o-phen)]PF6exhibits the best electroluminescent performances.