辅助配体对噌啉类铱配合物光电性能的影响

Effect of Ancillary Ligand on Photoelectric Properties of Cinnoline Iridium Complexes

合成了2种新的噌啉类铱配合物(dpci)_2Ir(paz)和(dpci)_2Ir(taz)(dpci=3,4-二苯基噌啉,paz H=5-(2′-吡啶基)-3-三氟甲基-吡唑,taz H=5-(2′-吡啶基)-3-三氟甲基-1,2,4-三唑),通过核磁共振氢谱和氟谱及高分辨质谱对其结构进行了确定,同时对其光电性能进行了表征。结果表明在聚甲基丙烯酸甲酯(1%,w/w)中(dpci)_2Ir(paz)和(dpci)_2Ir(taz)的发光波长分别为616和612 nm,相对参比铱配合物(dpci)_2Ir(pic)的波长(625 nm)有了较大蓝移,发光量子效率也由16.1%提高到了51.9%和32.5%。改进辅助配体后,材料的稳定性明显提高,使其能用蒸镀法制备有机电致发光器件。基于(dpci)_2Ir(paz)的器件发光为纯红光,CIE色坐标为(0.66,0.34),最大亮度为2 054 cd·m^(-2),最大电流效率为8.5 cd·A^(-1)。基于(dpci)_2Ir(taz)的器件最大亮度为2 931 cd·m^(-2),最大电流效率为14.5 cd·A^(-1)。

Two new cyclometalated iridium!)comPlex(dPci)2Ir(Paz)and(dPci)2Ir(taz)(dPci=3,4-diP;enylcinnoline,PazH=5-(2_Pyridfl)-3-tri:fuoromet;flPfrazole,tazH=5-tri?uoromet;f l-3-(Pfridin-2-yl)-1V-1,2,4-triazole),were success?ully synthesized and characterized by NMR spectroscopy and;ig;resolution mass spectrometry.The photoluminescence spectra o?(dpci)2Ir(paz)and(dpci)2Ir(taz)in PMMA(1%,w/w)show emission maximum at 616 and 612 nm,which are blue shifted compared to that o?reference complex(dpci)2Ir(pic)(pic=picolinate,625 nm).The quantum yields o?(dpci)2Ir(paz)and(dpci)2Ir(taz)are 51.9%and 32.5%,which are higher than that o?(dpci)2Ir(pic)(16.1%).A?ter modi?ication,the thermal stability o?complexes are enhanced,and they can be used to prepare organic electroluminescent devices by evaporation method.OLED device using(dpci)2Ir(paz)as dopant exhibitedintense saturated red emission with CIE coordinates of(0.66,0.34).The device has the best performance with a maximum external quantum efficiency of 2.7%and luminance efficiency of 8.5 cd'A"1.The maximum luminance was 2 484 cd.m_2.The device based on I(dpci)2lr(taz)exhibits the best efficiency.Its maximum external quantum efficiency is 5.5%and the corresponding efficiency is 14.5 cd'A"1.The maximum luminance is 2 931 cd'm"2.