期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 42, 页码 22721-22726出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm33084a
关键词
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资金
- National Research Foundation of Korea
- MKE
- KIAT through the Workforce Development Program in Strategic Technology
- Korean Government [2012-0000145, 2012-047047]
New blue iridium complexes with a trimethylsilyl group as a bulky electron donating group, Ir(F-2-p-trimethylsilyl)(2)(fptp) and Ir(F-2-m-trimethylsilyl)(2)(fptp), were synthesized via mu-chloro-bridged dimer and perfluoropropylated triazole-based ancillary ligands and then characterized using various spectroscopic studies. Both Ir(F-2-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(F-2-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).
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