合成了4种吡嗪铱配合物, 用质谱和1H NMR对配合物结构进行了表征, 通过紫外-可见吸收光谱和光致发光光谱对其光物理性质进行了研究。结果表明: 4种铱配合物都出现了金属-配体电荷转移( MLCT )吸收峰。铱配合物1 ［(DFMPPZ)2Ir(pic)］、2 ［(DFMPPZ)2IrCl(PPh3)］、3 ［(DFMPPZ)2Ir(CN)(PPh3)］和4 ［(DPPF)2Ir(acac)］的发射波长分别为528, 536, 535, 561 nm, 都是潜在的黄、绿色磷光材料。以铱配合物4为客体材料, 制备了结构为ITO/MoO3(1 nm)/CBP(35 nm)/CBP∶Ir(15 nm)/TPBi(50 nm)/LiF(1nm)/Al(100 nm)的一系列不同掺杂浓度的器件, 器件的发射波长为567 nm, 最大亮度达到32 110 cd·m-2, 最大电流效率为32.4 cd·A-1, 最大功率效率为28.2 lm·W-1。

Four iridium (Ⅲ) pyrazine complexes 1 ［(DFMPPZ)2Ir(pic)］, 2 ［(DFMPPZ)2IrCl-(PPh3)］, 3 ［(DFMPPZ)2Ir(CN)(PPh3)］, and 4 ［(DPPF)2Ir(acac)］ were synthesized, where DFMPPZ= 2-(2,4-difluorophenyl)- 3-methylpyrazine, pic=picolinate, Ph=phenyl, acac=acetylacetonate, MDPPF=4,4′-difluoro-5-methyl-2,3- diphenylpyrazine. The complexes were characterized by mass spectrometry (MS) and nuclear magnetic resonance (NMR) spectroscopy. Their photophysical properties were investigated by UV-Vis and photoluminescence (PL) spectroscopy. All of these Ir (Ⅲ) complexes show the noticeable absorption peaks from metal-to-ligand charge transfer (MLCT) transitions. The iridium (Ⅲ) complexes 1, 2, 3 and 4 have strong photoluminescence at 528, 536, 535 and 561 nm, respectively. Moreover, the iridium (Ⅲ) complex 4 was utilized as phosphorescence dopant in OLEDs with the structures of ITO/MoO3(1 nm)/CBP(35 nm)/CBP∶Ir(15 nm)/TPBi(50 nm)/LiF(1nm)/Al(100 nm). The devices showed yellow emission at 567 nm with a maximum brightness of 32 110 cd·m-2, current efficiency of 32.4 cd·A-1, and power efficiency of 28.2 lm·W-1.