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Synthesis and Characterization of a Fluorene–Quinoxaline Copolymer for Light-Emitting Applications

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Abstract:

A conjugated copolymer based on 9,9-dioctyl-fluorene and 2,3-bis(4-(hexyloxy)phenyl) quinoxaline has been synthesized by the palladium-catalyzed Suzuki coupling reaction. The synthesized polymer was soluble in common organic solvents such as chloroform, THF, and toluene and had good film properties. The polymer was analyzed by 1H-NMR spectroscopy, UV-vis spectroscopy, GPC, TGA, DSC, and cyclic voltammetry. It had very good thermal properties with high decomposition and glass transition temperatures, 420 °C and 159 °C respectively, and a low band gap of 2.51 eV. The polymer LEDs (ITO/PEDOT:PSS/polymer/LiF/Ca/Al) showed pure green light emission with maximum peaks at 502 nm and CIE coordinates of x = 0.28 and y = 0.55. The turn-on voltage of the polymer device was 7 V and the maximum brightness was 10.16 cd/m2 at 14 V. The maximum luminescence efficiency of the polymer was 0.0011 cd/A at 11 V.

Keywords: FLUORENE-QUINOXALINE COPOLYMER; GREEN OLED; SUZUKI COUPLING REACTION

Document Type: Research Article

DOI: https://doi.org/10.1166/jnn.2010.1542

Publication date: 2010-01-01

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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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