Synthesis and light-emitting properties of copolymers composed of fluorene and N-alkoxyphenylphenothiazine |
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Authors: | Suk-Kyung Kim Jae-Hoon Eom Dongbo Mi Choong-Hwa Jung Ji-Hoon Lee In-Nam Kang Jae-Hoon Kim Do-Hoon Hwang |
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Affiliation: | aDepartment of Applied Chemistry, Kumoh National Institute of Technology, 1 Yangho-dong, Kumi 730-701, Republic of Korea;bDepartment of Polymer Science and Engineering, Chungju National University, Chungju 380-702, Republic of Korea;cDepartment of Chemistry, The Catholic University of Korea, Bucheon 420-743, Republic of Korea;dDepartment of Polymer Science and Engineering, Kumoh National Institute of Technology, Kumi 730-701, Republic of Korea |
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Abstract: | Poly[10-(4′-octyloxyphenyl)-phenothiazine-3,7-diyl] (POPPTZ), poly[9,9-bis(4′-octyloxyphenyl)fluorene-2,7-diyl] (PBOPF), and their random copolymers, poly(BOPF-co-OPPTZ), were synthesized through Ni(0) mediated polymerization. Light-emitting devices were fabricated using these polymers in an ITO (indium-tin oxide)/PEDOT:PSS/polymer/Ca/Al configuration. Each EL device constructed with a poly(BOPF-co-OPPTZ) copolymer exhibited significantly enhanced efficiency and brightness compared to devices constructed from the POPPTZ and PBOPF homopolymers. The EL device constructed with poly(83BOPF-co-17OPPTZ) exhibited the highest power efficiency and brightness (8,610 cd/m2 and 2.831 cd/A, respectively). This enhanced efficiency of the copolymer devices results from their improved hole injection and more efficient charge carrier balance, which arise due to the HOMO levels (5.42 eV) of the poly(BOPF-co-OPPTZ) copolymers, which are lower than that of the PBOPF homopolymer (5.79 eV). |
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Keywords: | Polyfluorene N-Alkoxyphenylphenothiazine Light-emitting diodes Organic semiconductor |
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