Journal of Information Display

The Korean Infomation Display Society (한국정보디스플레이학회)
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Solution-processed electrophosphorescent devices with a thin fluoropolymer at the hole transport interfacial layer

  • Park, Jae-Kyun (Department of Polymer Science and Engineering, Dankook University) ;
  • Hwang, Gyoung-Seok (Department of Polymer Science and Engineering, Dankook University) ;
  • Lee, Tae-Woo (Department of Materials Science and Engineering, Pohang University of Science and Technology) ;
  • Chin, Byung-Doo (Department of Polymer Science and Engineering, Dankook University)
  • Received : 2011.08.15
  • Accepted : 2011.09.05
  • Published : 2011.12.31
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Abstract

Electrophosphorescent devices with ionomer-type hole transport layers were investigated. On top of the 3,4-ethylenedioxy thiophene:poly(4-styrene sulfonate) [PEDOT:PSS] structures, fluoropolymer interfacial layers (FPIs) with different side chain lengths were introduced. Both for the PEDOT:PSS/FPI (layered) and PEDOT:PSS (mixed) structures with soluble phosphorescent emitters, the short-side-chain FPIs showed higher efficiency. The difference in the electrical properties of the two FPIs for bipolar (light-emitting) devices was not clear, but the hole-only device clearly showed the favored hole injection at the PEDOT:PSS/FPI structure with a shorter side chain, a copolymer of tetrafluoroethylene and sulfonyl fluoride vinyl ether.

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References

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