A series of novel iridium(III) complexes with two 2-arylquinoline derivatives as cyclometalated ligands and one monoanionic ligand, such as acetylacetonate (acac), N,N′-diethyldithiocarbamate (Et2dtc) and O,O′-diethyldithiophosphate (Et2dtp), as ancillary ligands have been synthesized and structurally characterized by 1H NMR, MS and elemental analysis (EA). The cyclic voltammetry, absorption, emission and electroluminescence properties of these complexes were systematically investigated. Through extending π-conjugation, introducing electron-donating groups in the ligand frame, or changing the ancillary ligands, the HOMO energy levels of the iridium(III) complexes can be tuned, while their LUMO levels remain little affected; in consequence, the emission wavelengths of the iridium(III) complexes can be tuned in the range 606–653 nm. The highly efficient organic light-emitting diodes (OLEDs) with saturated red emission have been demonstrated. A maximum current efficiency of 10.79 cd A−1, at a current density of 0.74 mA cm−2, with an emission wavelength of 616 nm and Commisioon Internationale de L'Eclairage (CIE) coordinates of (0.65, 0.35), which are very close to the National Television System Comittee (NSTC) standard red emission, have been achieved when using complex (DPQ)2Ir(acac) as a phosphor dopant.
                                    合成了一系列新型
铱(III)配合物,采用两种2-芳基
喹啉衍
生物作为环
金属化
配体,以及单阴离子
配体,如乙酰乙酮(acac)、
二乙基硫代
氨基甲酸盐(Et2dtc)和二
乙基磷酸硫酯(Et2dtp)作为辅助
配体,并通过1H NMR、质谱(MS)和元素分析(EA)进行了结构表征。这些配合物的循环伏安法、电吸收、发射和电致发光特性进行了系统研究。通过延展π-共轭、在
配体框架中引入电子给体基团,或改变辅助
配体,可以调节
铱(III)配合物的HOMO能级,而其LUMO能级几乎不受影响;因此,
铱(III)配合物的发射波长可以调节至606–653 nm范围内。已展示出高效率的有机发光二极管(OLED),具有饱和红色发光。在使用配合物(DPQ)2Ir(acac)作为荧光粉掺杂剂时,达到了最大电流效率为10.79 cd A−1,电流密度为0.74 mA cm−2,发射波长为616 nm,国际照明委员会(CIE)坐标为(0.65, 0.35),这些数据与国家电视系统委员会(NSTC)标准红色发光非常接近。