Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1787750 | Current Applied Physics | 2011 | 4 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Woo Sik Jeon, Chandramouli Kulshreshtha, Jae Hyung Yu, Myung Jin Lim, Jung Soo Park, Jang Hyuk Kwon,