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Fluorenylpyridine-Derived Iridium Complexes for Electrophosphorescent Light-Emitting Diodes

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To develop efficient emitting materials for organic light-emitting diodes (OLEDs), a series of cyclometalated iridium complexes with 2-fluorenylpyridine-derived ligands were synthesized. Complexes 1–4 exhibited yellow to red phosphorescence with quantum yields of 0.17–0.33 in degassed CH2Cl2. Multilayered OLEDs were fabricated by using these iridium complexes as dopant materials. In the device employing complex 1 as a dopant, the maximum luminance, maximum luminance efficiency and maximum power efficiency were 15600 cd/m2 at 14 V, 12.8 cd/A, and 8.94 lm/W, respectively, at the CIE coordinates of (0.648, 0.350), which is close to the saturated red emission. The electron-withdrawing carbonyl substituent groups affected markedly the EL performances of fluorenylpyridine-derived iridium complexes as red emitting materials.
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Keywords: CARBONYL-SUBSTITUTED FLUORENYLPYRIDINE LIGAND; ELECTROLUMINESCENCE; IRIDIUM COMPLEX; RED PHOSPHORESCENCE

Document Type: Research Article

Publication date: 2010-05-01

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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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