基于萘基噁二唑衍生物环金属铱配合物的合成及其光电性能研究

Synthesis and Optoelectronic Properties of Iridium Complexes with Naphthalenyl Oxadiazole Cyclometalated Ligands

合成并表征了两种基于萘基噁二唑衍生物环金属铱配合物(DFPhNOXD)2Ir(acac)和(DNOXD)2Ir(acac).以该类铱配合物为客体,聚9,9-二辛基芴(PFO)和2-叔丁基苯基-5-二苯基1,3,4噁二唑(PBD)为主体制作了电致发光器件.研究发现,两种配合物的电致发光均为红光,其中基于配合物(DFPhNOXD)2Ir(acac)的电致发光器件的发射峰在580nm处,626nm处有肩峰,器件的最大发光效率为1.9cd/A.基于配合物(DNOXD)2Ir(acac)的电致发光器件的发射峰在593nm处,642nm处有肩峰,最大发光效率为3.3cd/A.值得关注的是,在电流密度为100mA/cm2时,基于配合物(DNOXD)2Ir(acac)的发光器件的效率滚降不明显,发光效率仍保持在2.2cd/A.

Two novel iridium complexes containing naphthalenyl oxadiazole cyclo-metalated ligands, named （DFPhNOXD） 2 Ir （acac） and （DNOXD） 2 Ir（ acac）, were synthesized and characterized. Using these i- ridium complexes as dopants and a blend of poly（9,9-dioetylfluorene） and 2-tert-butyl phenyl-5-biphenyl- 1,3,4-oxadiazole as a host matrix, the devices displayed a bright red emission at about 580 nm and a shoul- der around 626 nm with a maximum luminance efficiency of 1.9 cd/A for （DFPhNOXD） 2Ir（acac）. And a red emission at about 593 nm and a shoulder around 642 nm,with a highest luminance efficiency of 3.3 cd/ A for the （DNOXD）2 Ir（acac）-doped device. Interestingly, the devices exhibited a small efficiency roll-off, and still displayed a luminescent efficiency as high as 2.2 cd/A at 100 mA/cm2.