Highly efficient iridium(III) complexes with diphenylquinoline ligands for organic light-emitting diodes: Synthesis and effect of fluorinated substitutes on electrochemistry, photophysics and electroluminescence
作者:Xiaowei Zhang、Jia Gao、Chuluo Yang、Linna Zhu、Zhongan Li、Kai Zhang、Jingui Qin、Han You、Dongge Ma
DOI:10.1016/j.jorganchem.2006.07.008
日期:2006.10
cyclometalated iridium(III) complexes bearing 2,4-diphenylquinoline ligands with fluorinated substituent were prepared and characterized by elemental analysis, NMR and mass spectroscopy. The cyclic voltammetry, absorption, emission and electroluminescent properties of these complexes were systematically investigated. Electrochemical studies showed that the oxidation of the fluorinated complexes occurred
制备了一系列带有2,4-二苯基喹啉配体和氟化取代基的新型环金属化铱(III)配合物,并通过元素分析,NMR和质谱进行了表征。系统研究了这些络合物的循环伏安法,吸收,发射和电致发光性质。电化学研究表明,与未氟化的复合物1(0.42 V)相比,氟化物的氧化发生在更高的正电势(0.57–0.69 V范围内)。考虑到能级,氟化引起的LUMO的降低显着小于HOMO的降低。在300-600 nm范围内的弱和低能量吸收带很好地解决,有可能与MLCT和相关的3 π-π *过渡。这些络合物在溶液和固态下均显示出强烈的橙红色发射。含氟复合物的发射最大值表明由图9,24和15纳米为蓝移2,3和4分别相对于所述未氟化类似1。通过使用配合物作为掺杂剂材料制备了多层有机发光二极管(OLED)。显著更高的性能和较低的导通电压使用氟化络合物作为发射极比得以实现,使用未氟化对应物1相同的掺杂水平下。使用配合物2和3的OLED器件因为在3