한국정보디스플레이학회:학술대회논문집

The Korean Infomation Display Society (한국정보디스플레이학회)
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Highly Efficient Green Phosphorescent Organic Light Emitting Diodes

  • Lee, Se-Hyung (Department of Materials Science and Engineering and OLED Center, Seoul National University) ;
  • Park, Hyung-Dol (Department of Materials Science and Engineering and OLED Center, Seoul National University) ;
  • Kang, Jae-Wook (Department of Materials Science and Engineering and OLED Center, Seoul National University) ;
  • Kim, Hyong-Jun (Department of Materials Science and Engineering and OLED Center, Seoul National University) ;
  • Kim, Jang-Joo (Department of Materials Science and Engineering and OLED Center, Seoul National University)
  • Published : 2008.10.13
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Abstract

We have developed green phosphorescent organic light-emitting diodes (OLEDs) with high quantum efficiency. Wide-energy-gap material, 1,1-bis[(di-4-tolylamino) phenyl]cyclohexane (TAPC), with high triplet energy level was used as a hole transporting layer. Electrophosphorescent devices fabricated using TAPC as a hole-transporting layer and N,N'-dicarbazolyl-4,4'-biphenyl (CBP) doped with fac-tris(2-phenylpyridine) iridium [Ir(ppy)3] as the emitting layer showed the maximum external quantum efficiency ($\eta_{ext}$) of 19.8 %, which is much higher than the devices adopting 4,4'-bis[N-(1-naphthyl)-N-phenyl-amino]biphenyl (NPB) (${\eta}B_{ext}=14.6%$) as a hole transporting layer.

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