Synthesis and characterization of new blue light emitting iridium complexes containing a trimethylsilyl group
作者:Chul Young Kim、Dong-Gwang Ha、Hyun Hee Kang、Hui-Jun Yun、Soon-Ki Kwon、Jang-Joo Kim、Yun-Hi Kim
DOI:10.1039/c2jm33084a
日期:——
New blue iridium complexes with a trimethylsilyl group as a bulky electron donating group, Ir(F2-p-trimethylsilyl)2(fptp) and Ir(F2-m-trimethylsilyl)2(fptp), were synthesized via μ-chloro-bridged dimer and perfluoropropylated triazole-based ancillary ligands and then characterized using various spectroscopic studies. Both Ir(F2-p-trimethylsilyl)2(fptp) and Ir(F2-m-trimethylsilyl)2(fptp) exhibited high photoluminescence quantum efficiencies of 75 ± 5% and 76 ± 5% in films, respectively. The DFT calculation demonstrated that the new blue iridium complexes have a wide bandgap compared with FIrpic and the Ir(F2-p-trimethylsilyl)2(fptp) with a trimethylsilyl group in the para position has a slightly deeper HOMO level than that of the Ir(F2-p-trimethylsilyl)2(fptp) with a trimethylsilyl group in the meta position. The UV-vis absorption and photoluminescent (PL) spectra of the complexes were blue shifted compared with those of FIrpic. The device using the Ir(F2-p-trimethylsilyl)2(fptp) exhibited a maximum external quantum efficiency of 19.3% (at 0.00152 mA cm−2) and commission Internationale de l'Eclairage (CIE) coordinates of (0.145, 0.247).
通过μ-氯桥接二聚体和全氟丙基三唑基辅助配体合成了以三甲基硅基为笨重电子供体的新型蓝色铱配合物--Ir(F2-p-三甲基硅基)2(ftp)和Ir(F2-m-三甲基硅基)2(ftp),并利用各种光谱研究对其进行了表征。Ir(F2-p-三甲基硅基)2(ftp)和 Ir(F2-m-三甲基硅基)2(ftp)在薄膜中的光量子效率分别达到 75 ± 5% 和 76 ±5%。DFT 计算表明,与 FIrpic 相比,新型蓝铱配合物具有较宽的带隙,并且对位三甲基硅基的 Ir(F2-p-trimethylsilyl)2(fptp) 的 HOMO 水平比元位三甲基硅基的 Ir(F2-p-trimethylsilyl)2(fptp) 的 HOMO 水平略深。与 FIrpic 相比,复合物的紫外可见吸收和光致发光(PL)光谱发生了蓝移。使用 Ir(F2-p-三甲基硅基)2(ptp)的装置显示出 19.3% 的最大外部量子效率(0.00152 mA cm-2),国际照明委员会(CIE)坐标为 (0.145, 0.247)。