한국정보디스플레이학회:학술대회논문집

The Korean Infomation Display Society (한국정보디스플레이학회)
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Bright and Efficient Electrophosphorescence from Polymer Based LED

  • Xie, Zhiliang (Center for Display Research, Department of Chemistry, The Hong Kong University of Science and Technology) ;
  • Qiu, Chengfeng (Center for Display Research, The Hong Kong University of Science and Technology) ;
  • Peng, Huajun (Center for Display Research, The Hong Kong University of Science and Technology) ;
  • Chen, Haiying (Center for Display Research, The Hong Kong University of Science and Technology) ;
  • Wong, Man (Center for Display Research, The Hong Kong University of Science and Technology) ;
  • Tang, Ben Zhong (Center for Display Research, Department of Chemistry, The Hong Kong University of Science and Technology) ;
  • Kwok, Hoi Sing (Center for Display Research, The Hong Kong University of Science and Technology)
  • Published : 2003.07.09
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Abstract

The electrophosphorescent emission properties were investigated in polymer light-emitting diodes (PLEDs) based on a poly(9-vinylcarbazole) (PVK) doped with a green phosphorescent dye of fac-tris(2-phenylpyridine) iridium (III) [$Ir(ppy)_3$]. A green light peaked at 516 nm was emitted from devices with a configuration of ITO/PEDOT:PSS/PVK:$Ir(ppy)_{3}$/BCP/$Alq_{3}$/LiF/Al. The optimal doping concentration of $Ir(ppy)_{3}$ in PVK was found at 2% by weight, under which maximum current efficiency of 24.3 cd/A and peak external quantum efficiency of 6.8% were achieved at the high luminance of 4240 $cd/m^{2}$. The external quantum efficiency of 5% and current efficiency of 18 cd/A can be sustained even at the very high luminance of 35000 $cd/m^{2}$.

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