High efficiency green phosphorescent OLEDs with triplet exciton confinement architecture

作者：Jeon Woo Sik; Kulshreshtha Chandramouli; Yu Jae Hyung; Lim Myung Jin; Park Jung Soo; Kwon Jang Hyuk^*

来源：Current Applied Physics, 2011, 11(3): 311-314.

DOI：10.1016/j.cap.2010.07.024

• Phosphorescent
• OLED
• Green
• Exciton
• Triplet

We report highly efficient green phosphorescent devices comprising a triplet exciton confinement configuration, using 4,4'-N,N'-dicarbazoleterpheyl(CTP) as a narrow band-gap host and high triplet energy charge transporting layers. Maximum current and power efficiencies of 56.89 cd/A, and 48.22 lm/W (external quantum efficiency of 18.0%) are demonstrated by optimizing the doping concentration. Such high efficiency is attributed to good confinement effect of triplet excitons by narrow band-gap CTP host with reasonable doping concentration and introduction of good exciton blocking layers at the emitting layer interfaces.

• 出版日期2011-5