Introduction of the Benzoquinoline Ancillary Ligand to the Iridium Complexes for Organic Light-Emitting Diodes

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Abstract:

The new iridium complexes, Ir(C∧N)2(bq), (C∧N = ppy, F2-ppy, 2,3-dpqx-F2 or 4-Me-2,3-dpq) were prepared and their luminescence properties were investigated, where ppy, F2-ppy, 2,3-dpqx-F2, 4-Me-2,3-dpq and bq represent 2-phenylpyridine, 2-(4′,6′-difluorophenyl)-pyridine, 2,3-bis (4′-fluorophenyl)quinoxaline, 4-methyl-2,3-diphenylquinoline and 10-hydroxybenzoquinoline ligands, respectively. We expected that the relative energy levels of the main ligands (C∧N) and ancillary ligand, bq, in the complexes could determine the possibility of interligand energy transfer (ILET) in the complexes and thereby luminescence properties. The main ligands, F2-ppy and 2,3-dpqx-F2, which have drastically different energy gaps between the HOMO and LUMO energy levels were chosen and their complexes were synthesized. The photoabsorption, photoluminescence and electroluminescence of the complexes were studied. Ir(ppy)2(bq), Ir(F2-ppy)2(bq) Ir(2,3-dpqx-F2)2(bq) and Ir(4-Me-2,3-dpq)2(bq) exhibited the luminescence maxima between 600∼694 nm and their efficiencies were affected by the main ligands. While Ir(ppy)2(bq) and Ir(F2-ppy)2(bq) showed relatively high luminous efficiencies (>10 cd/A), Ir(2,3-dpqx-F2)(bq) had poor luminous efficiency (0.30 cd/A). The electrochemical properties were studied to support ILET in the ppy-based iridium complexes. Their luminescence performances were compared with those of the complexes containing acetylacetonate (acac) ancillary ligand which are not allowed to have ILET.

Keywords: ANCILLARY LIGAND; HYDROXYBENZOQUINOLINE (BQ); IRIDIUM COMPLEX; OLED; RED PHOSPHORESCENCE

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2012.4592

Publication date: February 1, 2012

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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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