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EL Properties of Polyfluorene Copolymers Containing Hole-Transporting Carbazole Group

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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.

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Authors and Affiliations

  1. Department of Applied Chemistry, Kumoh National Institute of Technology, 730-701, Kumi, Korea

    Do-Hoon Hwang, Jong-Don Lee & Moo-Jin Park

  2. Electronic Materials Lab., Samsung Advanced Institute of Technology, P.O. Box 111, 440-600, Suwon, Korea

    Ji-Hoon Lee

  3. Department of Physics, Inha University, 402-751, Incheon, Korea

    Chang-Hee Lee

Authors
  1. Do-Hoon Hwang
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  2. Jong-Don Lee
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  3. Moo-Jin Park
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  4. Ji-Hoon Lee
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  5. Chang-Hee Lee
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Correspondence to Do-Hoon Hwang.

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Hwang, DH., Lee, JD., Park, MJ. et al. EL Properties of Polyfluorene Copolymers Containing Hole-Transporting Carbazole Group. MRS Online Proceedings Library 771, 427 (2003). https://doi.org/10.1557/PROC-771-L4.27

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  • DOI: https://doi.org/10.1557/PROC-771-L4.27

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