We report electroluminescence with a peak wavelength at 338 nm from a simple bilayer organic light emitting device (OLED) made using 4,4’-bis(diphenylphosphine oxide) biphenyl (PO1). In an OLED geometry, the material is preferentially electron transporting. Doping the PO1 layer with iridium(III)bis(4,6-(di-fluorophenyl)-pyridinato-N, C2’)picolinate (FIrpic) gives rise to electrophosphorescence with a peak external quantum efficiency of 7.8% at 0.09 mA/cm2 and 5.8% at 13 mA/cm2. The latter current density is obtained at 6.3 V applied forward bias. This represents a new class of wide-bandgap charge transporting organic materials which may prove useful as host materials for blue electrophosphoresent OLEDs.
Revised: April 27, 2011 |
Published: May 1, 2006
Citation
Burrows P.E., A.B. Padmaperuma, L.S. Sapochak, P.I. Djurovich, and M.E. Thompson. 2006.Ultraviolet Electroluminescence and Blue-Green Phosphorescence using an Organic Diphosphine Oxide Charge Transporting Layer.Applied Physics Letters 88.PNNL-SA-48236.doi:10.1063/1.2193429