| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1267597 | Organic Electronics | 2011 | 5 Pages |
High efficiency solution processed blue and deep blue phosphorescent organic light-emitting diodes (PHOLEDs) were developed using an alcohol soluble 2,7-bis(diphenylphosphoryl)-9-phenyl-9H-carbazole (PPO27) as the host material for the emitting layer. Iridium(III) bis(4,6-(di-fluorophenyl)-pyridinato-N,C′) picolinate (FIrpic) and iridium(III) bis((3,5-difluoro-4-cyanophenyl)pyridinato-N,C′) picolinate (FCNIrpic) were doped into the PPO27 host using 2-propanol as the solvent for the emitting layer. The alcohol soluble PPO27:FIrpic and PPO27:FCNIrpic emitting layers could form an orthogonal film with an organic soluble hole transport layer and high quantum efficiency of 14.6% and 13.4% was achieved in the PPO27:FIrpic and PPO27:FCNIrpic devices, respectively. Sky blue color coordinate of (0.15, 0.36) was obtained in the PPO27:FIrpic device, while blue shifted color coordinate of (0.15, 0.26) was realized in the PPO27:FCNIrpic device.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► High efficiency solution processed blue organic light emitting diodes. ► Multilayer structure formation by alcohol soluble emitting layer. ► Orthogonal film formation by solubility difference between organic layers.
