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Synthesis of New Heteroleptic Iridium(III) Complex Consisting of 2-Phenylquinoline and 2-[4-(Trimethylsilyl) phenyl]Pyridine for Red and White Organic Light-Emitting Diodes

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A novel red iridium(III) complex, (PQ)2Ir(TMSppy), containing 2-phenylquinoline (PQ) as the main cyclometalated ligand and 2-[4-(trimethylsilyl)phenyl]pyridine (TMSppy) as the ancillary ligand, was synthesized for use in phosphorescent organic light-emitting diodes (OLEDs). (PQ)2Ir(TMSppy) had a red emission with a maximum emission wavelength (λmax) at 603 nm. To investigate the (PQ)2Ir(TMSppy) as a red emitter in OLEDs, we fabricated a device with a multi-layer architecture. The (PQ)2Ir(TMSppy) device showed an electroluminescence (EL) maximum emission peak at 612 nm and showed a maximum quantum efficiency (EQEmax) of 15.5% at a 10% doping concentration. In addition, white OLEDs, having three primary color components, made from (PQ)2Ir(TMSppy) with bis(4,6-difluorophenylpyridine)picolinate (FIrpic) and tris(2-phenylpyridinato- C2,N)iridium(III) (Ir(ppy)3) gave the best performances, with an EQEmax of 18.1%, maximum power efficiency (PEmax) of 22.8 lm/w, and maximum current efficiency (CEmax) of 36.5 cd/A with Commission Internationale de L’Eclairage coordinates of (0.39, 0.42) at a luminance of 1,000 cd/m2.
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Keywords: Iridium(III) Complex; Organic Light-Emitting Diodes; Phosphorescence

Document Type: Research Article

Affiliations: 1: Department of Chemistry, and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea 2: School of Chemical Engineering, Sungkyunkwan University 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi 440-746, Republic of Korea

Publication date: August 1, 2017

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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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