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Highly efficient yellow electroluminescence of iridium complexes with good electron mobility†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-03-13 00:00:00 , DOI: 10.1039/c8qm00060c
Hua-Bo Han 1, 2, 3, 4, 5 , Xiao-Feng Ma 1, 2, 3, 4, 5 , Zheng-Guang Wu 1, 2, 3, 4, 5 , You-Xuan Zheng 1, 2, 3, 4, 5
Affiliation  

Herein, two iridium(III) complexes with yellow emission using 1-(3,5-bis(trifluoromethyl)phenyl)isoquinoline (tfmphiq) and 4-(3,5-bis(trifluoromethyl)phenyl)quinazoline (tfmphqz) as the main ligands and tetraphenylimidodiphosphinate (tpip) as the ancillary ligand were applied in organic light-emitting diodes (OLEDs). The quinazoline moiety greatly influenced the nature of the complexes, and both the quantum yield and the electron mobility of Ir(tfmphqz)2(tpip) were much higher than that of Ir(tfmphiq)2(tpip) (Ir(tfmphiq)2(tpip) (λem: 581 nm and Φ: 0.61) and Ir(tfmphqz)2(tpip) (λem: 566 nm and Φ: 0.97)). Moreover, the device based on Ir(tfmphqz)2(tpip) displayed far better performance than that based on the Ir(tfmphiq)2(tpip) emitter. The device with a structure of ITO/MoO3 (3 nm)/TAPC (50 nm)/Ir(tfmphqz)2(tpip) (6 wt%): 26DCzPPy (10 nm)/TmPyPB (50 nm)/LiF (1 nm)/Al (100 nm) displayed a maximum luminance of 96 377 cd m−2 and a maximum current efficiency and a maximum power efficiency of 106.66 cd A−1 and 64.72 lm W−1, respectively, with low efficiency roll-off. The current efficiency still remains as high as 89.91 cd A−1 at the brightness of 1000 cd m−2 and 79.73 cd A−1 at the brightness of 5000 cd m−2. These results suggest that the Ir(III) complexes with quinazoline units are potential yellow phosphorescent materials for OLEDs.

中文翻译:

具有良好电子迁移率的铱配合物的高效黄色电致发光

在此,以1-(3,5-双(三氟甲基)苯基)异喹啉(tfmphiq)和4-(3,5-双(三氟甲基)苯基)喹唑啉(tfmphqz)为主要成分的黄色发射的两个铱(III)配合物配体和作为辅助配体的四苯基亚氨基二次膦酸酯(tpip)被应用于有机发光二极管(OLED)。喹唑啉部分极大地影响了配合物的性质,Ir(tfmphqz)2(tpip)的量子产率和电子迁移率均大大高于Ir(tfmphiq)2(tpip)Ir(tfmphiq)2( TPIP) λ EM:581 nm和Φ:0.61)和铱(tfmphqz)2(TPIP) λ EM:566nm处和Φ:0.97))。而且,基于Ir(tfmphqz)2(tpip)的设备显示出比基于Ir(tfmphiq)2(tpip)发射器的设备更好的性能。具有ITO / MoO 3(3 nm)/ TAPC(50 nm)/ Ir(tfmphqz)2(tpip)(6 wt%)结构的器件:26 DCzPPy(10 nm)/ TmPyPB(50 nm)/ LiF(1 nm)/ Al(100 nm)的最大亮度为96377 cd m -2,最大电流效率和最大功率效率为106.66 cd A -1和64.72 lm W -1分别具有低效率滚降。电流效率在1000 cd m -2的亮度下仍保持高达89.91 cd A -1,在5000 cd m -2的亮度下仍高达79.73 cd A -1。这些结果表明,具有喹唑啉单元的Ir(III)配合物是用于OLED的潜在黄色磷光材料。
更新日期:2018-03-13
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