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EL Properties of Polyfluorene Copolymers Containing Hole-Transporting Carbazole Group

Published online by Cambridge University Press:  15 February 2011

Do-Hoon Hwang
Affiliation:
Department of Applied Chemistry, Kumoh National Institute of Technology, Kumi 730-701, Korea(dhhwang@kumoh.ac.kr)
Jong-Don Lee
Affiliation:
Department of Applied Chemistry, Kumoh National Institute of Technology, Kumi 730-701, Korea(dhhwang@kumoh.ac.kr)
Moo-Jin Park
Affiliation:
Department of Applied Chemistry, Kumoh National Institute of Technology, Kumi 730-701, Korea(dhhwang@kumoh.ac.kr)
Ji-Hoon Lee
Affiliation:
Electronic Materials Lab.Samsung Advanced Institute of Technology, P.O. Box 111 Suwon 440-600, Korea
Chang-Hee Lee
Affiliation:
Department of Physics, Inha University, Incheon 402-751, Korea
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Abstract

An alkoxyphenyl substitutued new polyfluorene derivative, poly(9,9-bis(4'-n-octyloxyphenyl) fluorene) (PBOPF) was synthesized through Ni(0) mediated polymerization. Blue light-emitting PBOPF shows peak PL at 426 nm. No significant excimer emission was observed even after annealing the polymer film at 100 oC for 2h. Aseries of random copolymers of 2,7-dibromo-9,9-bis(4'-n-octyloxyphenyl)) fluorene (BOPF) and 2,7-dibromo-N-(2'-ethylhexyl)carbazole (EHC) were also synthesized through Ni(0) mediated polymerization. Carbazole comonomer was introduced to improve hole-transporting properties of PBOPF. The synthesized poly(BOPF-co-EHC)s showed similar UV-visible absorption and PL emission to PBOPF. EL devices were fabricated in an ITO/PEDOT/polymer/Ca/Al configuration. The EL devices using copolymers showed improved device performance than the device using PBOPF homopolymer due to a more balanced charge transport.

Type
Research Article
Copyright
Copyright © Materials Research Society 2003

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