High-efficiency white organic light-emitting devices using a blue iridium complex to sensitize a red fluorescent dye

We report the fabrication of high-efficiency white organic light-emitting devices (WOLEDs) by using a blue phosphorescent dye iridium (III) tris(5-(2,4-difluoro-phenyl)-10,10-dimethyl- 4-aza-tricycloundeca-2,4,6-triene) (Ir(F2-mppy)(3)) to sensitize the red dye[2-methyl-6- [2-(2,3,6,7-tetrahydro-1H c5H-benzo[ij]quinolizin-9-yl)ethenyl]-4H-pyran-4-ylidene]propane-din- itrile (DCM2). Ir(F2-mppy)(3) and DCM2 were codoped into the 4,4(')-N,N-'-dicarbazole-biphenyl (CBP) host. The WOLEDs with 8 wt % Ir(F2-mppy)(3) and 0.5 wt % DCM2 showed white emission with a color rendering index of 70. The maximum luminance and maximum current efficiency of the device are, respectively, 16 220 cd/m(2) and 9.28 cd/A. (c) 2006 American Institute of Physics.