Lu Guang-Zhao, Zhu Qi, Liu Liang, Wu Zheng-Guang, Zheng You-Xuan, Zhou Liang, Zuo Jing-Lin, Zhang Hongjie
State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering , Nanjing University , Nanjing 210093 , P. R. China.
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry , Chinese Academy of Sciences , Changchun 130022 , P. R. China.
ACS Appl Mater Interfaces. 2019 Jun 5;11(22):20192-20199. doi: 10.1021/acsami.9b02558. Epub 2019 May 22.
Three iridium(III) complexes (Ir(4tfmpq)mND, Ir(4tfmpq)mmND, and Ir(4tfmpq)mpND) with the 4-(4-(trifluoromethyl)phenyl)quinazoline (4tfmpq) main ligand and 1,5-naphthyridin-4-ol derivatives (mND: 8-methyl-1,5-naphthyridin-4-ol, mmND: 2,8-dimethyl-1,5-naphthyridin-4-ol, mpND: 8-methyl-2-phenyl-1,5-naphthyridin-4-ol) as ancillary ligands were studied. The complexes (Ir(4tfmpq)mND, Ir(4tfmpq)mmND, and Ir(4tfmpq)mpND) emit pure red emissions of 626-630 nm with high photoluminescence quantum yields of 85.2-93.4% in CHCl and better electron mobilities than that of tri(8-hydroxyquinoline)aluminum. By employing three pure red emitters, all the phosphorescent organic light-emitting diodes exhibited superior performances with a maximum external quantum efficiency of 31.48% and the efficiency roll-off is very mild, which are among the best results ever reported for pure red organic light-emitting diodes using Ir(III) complexes. In addition, CIE( x, y) coordinates of (0.670, 0.327) are also close to the standard red emission required by the National Television System Committee.
研究了三种铱（III）配合物（Ir(4tfmpq)mND、Ir(4tfmpq)mmND和Ir(4tfmpq)mpND），其主配体为4-(4-(三氟甲基)苯基)喹唑啉（4tfmpq），辅助配体为1,5-萘啶-4-醇衍生物（mND：8-甲基-1,5-萘啶-4-醇，mmND：2,8-二甲基-1,5-萘啶-4-醇，mpND：8-甲基-2-苯基-1,5-萘啶-4-醇）。这些配合物（Ir(4tfmpq)mND、Ir(4tfmpq)mmND和Ir(4tfmpq)mpND）在CHCl中发射出626 - 630 nm的纯红色发射光，光致发光量子产率高达85.2 - 93.4%，且电子迁移率优于三（8-羟基喹啉）铝。通过使用三种纯红色发射体，所有磷光有机发光二极管均表现出优异的性能，最大外量子效率为31.48%，效率滚降非常轻微，这是使用Ir(III)配合物的纯红色有机发光二极管所报道的最佳结果之一。此外，CIE( x, y)坐标为(0.670, 0.327)，也接近美国国家电视系统委员会要求的标准红色发射。
