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Highly Phosphorescent Cyclometalated Iridium(III) Complexes for Optoelectronic Applications: Fine Tuning of the Emission Wavelength through Ancillary Ligands

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posted on 20.03.2016, 00:00 by Łukasz Skórka, Michał Filapek, Lidia Zur, Jan Grzegorz Małecki, Wojciech Pisarski, Marian Olejnik, Witold Danikiewicz, Stanisław Krompiec
A series of novel, highly phosphorescent cyclometalated iridium­(III) complexes of type [(X2C^N)2Ir­(Q2bpy)]+PF6 (where X2C^N is 2-phenylpyridine or 2-(2,4-difluorophenyl)­pyridine anion and Q2bpy are 4,4′-bifunctionalized 2,2′-bipyridines) is presented. The complexes were fully characterized by means of NMR spectroscopy, high-resolution mass spectrometry (HRMS), cyclic voltammetry, and UV–vis. For several compounds also the crystallographic structures were obtained. The cyclometalates exhibited efficient photoluminescence at 298 K both in solution and in the solid state with good intensity and color purity. The emission wavelength range covered almost the whole visible spectrum and was strongly correlated with the EWG/ERG character of the Q substituent in the ancillary ligand. For further insight into the electronic structure of the complexes, a comprehensive electrochemical support (CV) was introduced, and finally, it was confronted with theoretical background using a density functional theory approach together with time-dependent calculations of the excited states.