Synthesis of electrochemically and thermally stable amorphous hole-transporting carbazole dendronized fluorene |
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| Authors: | Vinich Promarak Musubu Ichikawa Taweesak Sudyoadsuk Sayant Saengsuwan Siriporn Jungsuttiwong Tinnagon Keawin |
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| Affiliation: | 1. Advanced Organic Materials and Devices Laboratory, Department of Chemistry, Faculty of Science, Ubon Ratchathani University, Warinchumrap, Ubon Ratchathani 34190, Thailand;2. Department of Functional Polymer Science, Shinshu University, Ueda, Nagano 386-8567, Japan |
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| Abstract: | A novel amorphous hole-transporting carbazole dendrimer, 2,7-bis3,6-di(carbazol-9-yl)carbazol-9-yl]-9,9-bis-n-hexylfluorene (G2CF), was synthesized by a divergent approach involving bromination and Ullmann coupling reactions. G2CF showed UV–vis absorption bands at 304 and 332 nm in chloroform solution and the photoluminescence spectra showed a maximum peak at 373 nm in a bluish-purple region. Differential scanning calorimetry (DSC) and cyclic voltammetry (CV) analysis revealed G2CF was an electrochemically and thermally stable amorphous material with a high glass transition temperature (Tg) of 237 °C. The organic light-emitting device having the structure of ITO/G2CF/Alq3/LiF:Al exhibited a bright green emission with a maximum luminescence of 11,000 cd/m2 at 16 V and a turn-on voltage of 5.4 V. |
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| Keywords: | Carbazole dendrimer Hole-transporting Amorphous Organic light-emitting diode |
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