Synthesis and characterization of fluorene-carbazole and fluorene-phenothiazine copolymers with carbazole and oxadiazole pendants for organic light emitting diodes |
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| Authors: | Shuhei Yamada Seijung Park Suhee Song Mihee Heo Youngeup Jin Heesoo Lee Kohji Yoshinaga Hongsuk Suh |
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| Affiliation: | a Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 609-735, South Koreab Interdisciplinary School of Green Energy, Ulsan National Institute of Science and Technology, Ulsan 689-798, South Koreac Department of Industrial Chemistry, Pukyong National University, Busan 608-739, South Koread The WCU Center for Synthetic Polymer Bioconjugate Hybrid Materials, Department of polymer Science and Engineering, Pusan National University, Busan 609-735, South Koreae School of Materials Science and Engineering, Pusan National University, Busan 609-735, South Koreaf Department of Chemistry, Sungkyunkwan University, Gyeonggi-do, South Koreag Department of Applied Chemistry, Kyushu Institute of Technology Faculty of Engineering, Fukuoka 804-8550, Japan |
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| Abstract: | We report the synthesis and characterization of new series of the fluorene based polymers with carbazole and oxadiazole pendants for the generation of the white emission out of the EL device. In the fluorene backbone, hole transporting units such as carbazole or phenothiazine were incorporated to improve the EL brightness and efficiency. The PFCzOxd-co-PCzs and PFCzOxd-co-PPTZs in EL spectra showed maximum peaks at around 430 nm and additional large peaks at around 530 and 500 nm, respectively. In case of PFCzOxd-alt-PCz and PFCzCzPCz-co-PFOxdOxdPCz, the EL spectra of the polymers showed two distinct peaks comprising the maximum at 427 nm, which corresponds to the EL spectra of the conjugated backbone, and additional broad peaks at around 540 and 530 nm, respectively. The CIE coordinates of the devices from PFCzOxd-alt-PCz and PFCzCzPCz-co-PFOxdOxdPCz were (0.28, 0.33) and (0.25, 0.32), respectively, approaching the value of the standard white of National Television System Committee (NTSC) (0.33, 0.33). |
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| Keywords: | Conjugated polymer Carbazole Oxadiazole |
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