Enhanced efficiency and reduced roll-off in nondoped phosphorescent organic light-emitting devices with triplet multiple quantum well structures
Document Type
Article
Publication Date
8-23-2010
Abstract
Highly efficient nondoped phosphorescent organic light-emitting devices (NPOLEDs) with triplet multiple quantum well structures are fabricated by using 4, 4′ -N, N′ -dicarbazole-biphenyl and an iridium(III) complex as the potential barrier layer and the potential well layer/light-emitting layer, respectively. Remarkably, such NPOLED with an optimized device configuration achieves reduced current efficiency roll-off, which slightly decreases from its peak value of 31.5 cd/A at 19.8 mA/ cm2 to 29.2 cd/A at 100 mA/ cm2. We attribute this improvement to the efficient triplet exciton confinement effect and the suppression of triplet-triplet annihilation which occurs via single-step long range (Förster-type) energy transfer between excited molecules. © 2010 American Institute of Physics.
Publication Source (Journal or Book title)
Applied Physics Letters
Recommended Citation
Liu, S., Li, B., Zhang, L., Song, H., & Jiang, H. (2010). Enhanced efficiency and reduced roll-off in nondoped phosphorescent organic light-emitting devices with triplet multiple quantum well structures. Applied Physics Letters, 97 (8) https://doi.org/10.1063/1.3483131