We report high efficiency and low roll-off for blue electrophosphorescent organic light emitting devices (OLEDs) based on a mixed host layer architecture. The devices were fabricated using a mixed layer of di-[4-(N,N-ditolyl-amino)-phenyl]cyclohexane (TAPC), a hole transport material, and 2,8-bis(diphenylphosphoryl)dibenzothiophene (PO15), an electron transport material, as the host layer doped with the blue phosphor iridium (III) bis[(4,6-difluorophenyl)-pyridinato-N,C2’]picolinate (FIrpic). Using a mixed layer as the host allowed us to achieve high power efficiency (59 lm/W at 100 cd/m2), low turn-on voltage (2.7 V for >10 cd/m2), and low roll-off in these devices.
Revised: June 1, 2011 |
Published: July 20, 2010
Citation
Chopra N., J.S. Swensen, E. Polikarpov, L. Cosimbescu, F. So, and A.B. Padmaperuma. 2010.High efficiency and low roll-off blue phosphorescent organic light-emitting devices using mixed host architecture.Applied Physics Letters 97.PNNL-SA-71085.doi:10.1063/1.3464969