1403779-68-9Relevant academic research and scientific papers
Synthesis and characterization of new blue light emitting iridium complexes containing a trimethylsilyl group
Kim, Chul Young,Kang, Hyun Hee,Kim, Yun-Hi,Ha, Dong-Gwang,Kim, Jang-Joo,Yun, Hui-Jun,Kwon, Soon-Ki
, p. 22721 - 22726,6 (2012)
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(F 2-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(F 2-p-trimethylsilyl)2(fptp) with a trimethylsilyl group in the para position has a slightly deeper HOMO level than that of the Ir(F 2-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).
