Macromolecular Research

, Volume 13, Issue 2, pp 114–119

Synthesis and characterization of novel light-emitting copolymers with electron-withdrawing substituents

  • Sung-Ho Jin
  • Dae-Sung Koo
  • Chan-Koo Hwang
  • Jung Yun Do
  • Young-Inn Kim
  • Yeong-Soon Gal
  • Jae Wook Lee
  • Jin-Taek Hwang
Article

Abstract

We synthesized two new series of alternating copolymers, poly[bis(2-(4-phenylenevinylene)-2-cyanoethenyl)-9,9-dihexyl-9H-fluoren-2,7-yl-alt-1,4-phenylene](Polymer-I) and poly[bis(2-(4-phenylenevinylene)-2-cyanoethenyl)-9,9-dihexyl-9H-fluoren-2,7-yl-alt-2,7-(9,9-dihexylfluorene)](Polymer-II), via the Suzuki coupling reaction, for use in light-emitting diodes(LEDs). Defect-free uniformly thin films of these polymers were found to be easily formed on indium-tin oxide(ITO) coated glass substrates. Multi-layer LEDs with ITO/PEDOT/Polymer/ LiF/Al configurations with or without an Alq3 electron transport layer were fabricated with these polymers. The maximum EL emissions of Polymer-I and Polymer-II with an Alq3/LiF/Al cathode were observed at 516 and 533 nm, respectively. The maximum brightness and external luminance efficiency of the devices fabricated with the EL polymers were found to be 411 cd/m2 and 0.16 cd/A, respectively.

Keywords

electroluminescence light-emitting polymer light-emitting diode luminescence efficiency 

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Copyright information

© The Polymer Society of Korea and Springer 2005

Authors and Affiliations

  • Sung-Ho Jin
    • 1
  • Dae-Sung Koo
    • 1
  • Chan-Koo Hwang
    • 1
  • Jung Yun Do
    • 1
  • Young-Inn Kim
    • 1
  • Yeong-Soon Gal
    • 2
  • Jae Wook Lee
    • 3
  • Jin-Taek Hwang
    • 4
  1. 1.Department of Chemistry Education and Center for Plastic Information SystemPusan National UniversityBusanKorea
  2. 2.Polymer Chemsitry LabKyungil UniversityHayangKorea
  3. 3.Department of ChemistryDong-A UniversityBusanKorea
  4. 4.Department of Materials Sci. & Eng.Gwangju Institute of Science and TechnologyGwangjuKorea

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