New Blue Phosphorescent Iridium Complexes Containing Phenylpyridine and Triazole Ligands: Synthesis and Luminescence Studies

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Abstract:

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.

Keywords: BLUE PHOSPHORESCENCE; IRIDIUM COMPLEX; OLED; PPY LIGAND DERIVATIVES

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2011.3656

Publication date: May 1, 2011

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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