Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5399394 | Journal of Luminescence | 2015 | 5 Pages |
Abstract
Blue phosphorescent organic light-emitting diodes (PHOLEDs) were fabricated using double dopants FIrpic and FIr6 in emissive layer (EML) with structure of ITO/NPB (700Â Ã
)/mCP:FIrpic-8%:FIr6-x% (300Â Ã
)/TPBi (300Â Ã
)/Liq (20Â Ã
)/Al (1200Â Ã
). We optimized concentration of the second dopant FIr6 in the presence of a fixed FIrpic to observe its effect on electrical performance of PHOLED device. 24.8Â cd/A of luminous efficiency was achieved by the device with dopant ratio of 8%FIrpic:4%FIr6 in EML. Efficiency roll-off was also improved 20% compared to the PHOLED device singly dopped with FIrpic or FIr6 only. Second doping proved its effect in stabilizing charge balance in EML and enhancing energy transfer of triplet excitons between two dopants.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Seung Il Yoo, Ju An Yoon, Nam Ho Kim, Jin Wook Kim, Jin Sung Kang, Chang-Bum Moon, Woo Young Kim,