Synthesis and characterization of fluorene‐based copolymers containing benzothiadiazole derivative for light‐emitting diodes applications |
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| Authors: | Kyung‐Jin Yoon Jin Su Park Seung‐Joon Lee Myungkwan Song In Ae Shin Jae Wook Lee Yeong‐Soon Gal Sung‐Ho Jin |
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| Institution: | 1. Department of Chemistry Education and Interdisciplinary Program of Advanced Information and Display Materials, Pusan National University, Busan 609‐735, Korea;2. Department of Chemistry, Dong‐A University, Busan 604‐714, Korea;3. Polymer Chemistry Lab, College of General Education, Kyungil University, Hayang 712‐701, Korea |
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| Abstract: | Five new thermally robust electroluminescent fluorene‐based conjugated copolymers, including poly2,7‐(9,9‐dioctylfluorene)‐co‐4,7‐{5,6‐bis(3,7‐dimethyloctyloxymethyl)‐2,1,3‐(benzothiadiazole)}] ( PFO‐P2C10BT ) were synthesized and used to fabricate the efficient polymer light‐emitting diodes (PLEDs). The glass transition temperatures of the polymers were found to be higher than that of poly(9,9‐dialkylfluorenes) and are in the range 113–165 °C. We fabricated PLEDs in indium‐tin oxide/PEDOT/light‐emitting polymer/cathode configurations using either double‐layer LiF/Al or triple‐layer Alq3/LiF/Al cathode structures. The new copolymers were found to have emission colors that vary from greenish blue (491 nm) to green (543 nm) depending on the copolymer composition. The maximum brightness and luminance efficiency of these PLEDs were found to be up to 5347 cd/m2 and 1.51 cd/A at 10 V, respectively. © 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 6762–6769, 2008 |
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| Keywords: | conjugated polymers copolymerization fluorescence light‐emitting diodes |
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