New Blue Phosphorescent Iridium Complexes Containing Phenylpyridine and Triazole Ligands: Synthesis and Luminescence Studies
作者:So Youn Ahn、Hyun Shin Lee、Yunkyoung Ha
DOI:10.1166/jnn.2011.3656
日期:2011.5.1
The synthesis and luminescence of iridium(III) complexes containing new phenylpyridine (C^N) ligands, 4-Me-4′-F-ppy, 4-Me-4′-CF3-ppy and 4-OMe-4′-CF3-ppy, were studied. These ligands were designed for development of the blue light-emitting iridium complexes by introducing the electron-withdrawing group (F, CF3) and the electron-donating group (Me, OMe) at the para positions of the phenyl and pyridine ligand rings, respectively. As an ancillary ligand, trzl-CMe3 was employed where trzl-CMe3 represents 2-(5-tert′-butyl-2H-1,2,4-triazol-3-yl)pyridine. The resulting iridium complexes, Ir(4-Me-4′-F-ppy)2 (trzl-CMe3), Ir(4-OMe-4′-CF3-ppy)2 (trzl-CMe3) and Ir(4-Me-4′-CF3-ppy)2(trzl-CMe3) exhibited the blue emission at 472, 484 and 494 nm in CH2Cl2 solution, respectively. Ir(4-Me-4′-F-ppy)2(trzl-CMe3) showed the most hypsochromic shift in photoluminescence (PL) among the complexes prepared herein. In the electroluminescence (EL) spectra, Ir(4-Me-4′-F-ppy)2(trzl-CMe3) and Ir(4-Me-4′-CF3-ppy)2(trzl-CMe3) exhibited the luminescence peak at 437 nm and 496 nm, respectively. In the aspect of blue emission color purity, Ir(4-Me-4′-F-ppy)2(trzl-CMe3) had the CIE coordinates of (0.176, 0.143), very close to the saturated standard blue emission.
研究了含有新型苯基吡啶(C^N)配体的铱(III)复合物的合成和发光特性,这些配体为4-甲基-4′-氟-ppy、4-甲基-4′-三氟甲基-ppy和4-甲氧基-4′-三氟甲基-ppy。这些配体通过在苯环和吡啶配体环的对位引入电子吸引基团(氟、CF3)和电子供给基团(甲基、甲氧基)进行设计,以开发蓝光发射铱复合物。作为辅助配体,采用了trzl-CMe3,其中trzl-CMe3表示2-(5-叔丁基-2H-1,2,4-噻唑-3-基)吡啶。所得到的铱复合物Ir(4-Me-4′-F-ppy)2(trzl-CMe3)、Ir(4-OMe-4′-CF3-ppy)2(trzl-CMe3)和Ir(4-Me-4′-CF3-ppy)2(trzl-CMe3)在CH2Cl2溶液中分别展示了472、484和494 nm的蓝色发光。Ir(4-Me-4′-F-ppy)2(trzl-CMe3)在所制备的复合物中显示出光致发光(PL)最明显的蓝移。在电致发光(EL)光谱中,Ir(4-Me-4′-F-ppy)2(trzl-CMe3)和Ir(4-Me-4′-CF3-ppy)2(trzl-CMe3)分别显示出437 nm和496 nm的发光峰。在蓝色发光的颜色纯度方面,Ir(4-Me-4′-F-ppy)2(trzl-CMe3)的CIE坐标为(0.176, 0.143),非常接近饱和标准蓝光发射。