Confinement of triplet energy on phosphorescent molecules for highly-efficient organic blue-light-emitting devices

  • Tokito S
  • Iijima T
  • Suzuri Y
 et al. 
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Abstract

We have significantly improved the emission efficiency in an organic light-emitting device (OLED) based on iridium (III)bis[(4,6-di-fluoropheny)-pyridinato-N,C2']picolinate (FIrpic). To improve the efficiency, 4,4'-bis(9-carbazolyl)-2,2'-dimethyl-biphenyl, which has a high triplet energy, was used as the carrier-transporting host for the emissive layer. The FIrpic-based OLED exhibited a maximum external quantum efficiency of 10.4%, corresponding to a current efficiency of 20.4 cd/A, and a maximum power efficiency of 10.5 lm/W. The efficiency was drastically improved compared to that of a previously reported FIrpic-based OLED. This result indicates that triplet energy is efficiently confined on FIrpic molecules, resulting in the high efficiency. (C) 2003 American Institute of Physics.

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Authors

  • Shizuo Tokito

  • Toshiki Iijima

  • Yoshiyuki Suzuri

  • Hiroshi Kita

  • Toshimitsu Tsuzuki

  • Fumio Sato

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