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http://dx.doi.org/10.7317/pk.2013.37.6.736

Synthesis of Novel Carbazole-based Blue Light-emitting Copolymers Containing (Diphenylene)vinylene Pendants  

Kim, Woo Yeon (Department of Polymer Science and Engineering, Kyungpook National University)
Yoon, Keun-Byoung (Department of Polymer Science and Engineering, Kyungpook National University)
Publication Information
Polymer(Korea) / v.37, no.6, 2013 , pp. 736-743 More about this Journal
Abstract
Novel carbazole based copolymers were synthesized by Suzuki coupling polymerization. (Diphenylene)vinylene and n-octyl was introduced to carbazole as pendants for reducing band gap and improving solubility, respectively. Thermal, photoluminescence and electro-luminescence of copolymers were studied for applying the emitting layer of polymer light emitting diode (PLED). Maximum UV-vis absorption and photoluminescence (PL) emission wavelength of copolymers showed 333~340 nm and 409~464 nm in solution state, respectively. The relative quantum yield using 9,10-diphenylanthracene as a reference was 25.8%. These copolymers exhibited high thermal stability ($T_d$ = $350^{\circ}C$) and good film forming ability. Good luminance was obtained at voltages lower than 8 V and the onset voltage was observed at 4.0 V.
Keywords
carbazole copolymer; blue light-emitting; diphenylene vinylene;
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