Proceedings of the Korean Vacuum Society Conference (한국진공학회:학술대회논문집)

The Korean Vacuum Society (한국진공학회)
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A New Alternative Hole-transporting Layer to PEDOT:PSS for Realizing Highly Efficient All Solution-processable PLEDs

  • Kang, Beom-Goo (School of Materials Science and Engineering and Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology (GIST)) ;
  • Kang, Hong-Kyu (School of Materials Science and Engineering and Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology (GIST)) ;
  • Lee, Kwang-Hee (School of Materials Science and Engineering and Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology (GIST)) ;
  • Lee, Chang-Lyoul (Advanced Photonics Research Institute (APRI), Gwangju Institute of Science and Technology (GIST)) ;
  • Lee, Jae-Suk (School of Materials Science and Engineering and Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology (GIST))
  • Published : 2012.02.08
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Abstract

A new cross-linkable polymer, cross-linked d-PBAB, which has the triphenylamine as the hole transporting moiety and ethynyl group as the thermal cross-linker is firstly synthesized by the combination of anionic polymerization and deprotection process. The thermal cross-linking reaction was performed at $240^{\circ}C$ for 50 min and cross-linked d-PBAB layer showed smooth surface and is not soluble at organic solvent under spin-coating of emitting layer (EML). The solution-processed PLED which was fabricated with cross-linked d-PBAB as HTL showed approximately two times higher Lmax and four times higher LEmax than those obtained from PLED with PEDOT:PSS as the HTL. These result is ascribed to better ability of cross-linked d-PBAB to block electrons and to prevent exciton-quenching than those of PEDOT : PSS at the EML interface. This results strongly suggested that cross-linked d-PBAB can be a promising material to replace conventional PEDOT : PSS. It can be suspected that PLEDwith cross-linked d-PBAB would show longer lifetime compared with that of PLED with PEDOT : PSS, and thus further studies are under investigation.

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